Merge commit 'v2.6.32' into next

23 files changed, 217 insertions, 100 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index e3861b21e776..e4eca7810bcf 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -609,9 +609,9 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 
         acm->throttle = 0;
 
-        tasklet_schedule(&acm->urb_task);
         set_bit(ASYNCB_INITIALIZED, &acm->port.flags);
         rv = tty_port_block_til_ready(&acm->port, tty, filp);
+        tasklet_schedule(&acm->urb_task);
 done:
         mutex_unlock(&acm->mutex);
 err_out:
@@ -686,15 +686,21 @@ static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 
         /* Perform the closing process and see if we need to do the hardware
            shutdown */
-        if (!acm || tty_port_close_start(&acm->port, tty, filp) == 0)
+        if (!acm)
+                return;
+        if (tty_port_close_start(&acm->port, tty, filp) == 0) {
+                mutex_lock(&open_mutex);
+                if (!acm->dev) {
+                        tty_port_tty_set(&acm->port, NULL);
+                        acm_tty_unregister(acm);
+                        tty->driver_data = NULL;
+                }
+                mutex_unlock(&open_mutex);
                 return;
+        }
         acm_port_down(acm, 0);
         tty_port_close_end(&acm->port, tty);
-        mutex_lock(&open_mutex);
         tty_port_tty_set(&acm->port, NULL);
-        if (!acm->dev)
-                acm_tty_unregister(acm);
-        mutex_unlock(&open_mutex);
 }
 
 static int acm_tty_write(struct tty_struct *tty,
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 5ce839137ad6..0f857e645058 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -444,7 +444,7 @@ resubmit:
 static inline int
 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
 {
-        return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
+        return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
                                HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
                                tt, NULL, 0, 1000);
 }
diff --git a/drivers/usb/gadget/amd5536udc.c b/drivers/usb/gadget/amd5536udc.c
index d5b65962dd36..731150d4b1d9 100644
--- a/drivers/usb/gadget/amd5536udc.c
+++ b/drivers/usb/gadget/amd5536udc.c
@@ -1213,7 +1213,12 @@ udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp)
                                 tmp &= AMD_UNMASK_BIT(ep->num);
                                 writel(tmp, &dev->regs->ep_irqmsk);
                         }
-                }
+                } else if (ep->in) {
+                                /* enable ep irq */
+                                tmp = readl(&dev->regs->ep_irqmsk);
+                                tmp &= AMD_UNMASK_BIT(ep->num);
+                                writel(tmp, &dev->regs->ep_irqmsk);
+                        }
 
         } else if (ep->dma) {
 
@@ -2005,18 +2010,17 @@ __acquires(dev->lock)
 {
         int tmp;
 
-        /* empty queues and init hardware */
-        udc_basic_init(dev);
-        for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
-                empty_req_queue(&dev->ep[tmp]);
-        }
-
         if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
                 spin_unlock(&dev->lock);
                 driver->disconnect(&dev->gadget);
                 spin_lock(&dev->lock);
         }
-        /* init */
+
+        /* empty queues and init hardware */
+        udc_basic_init(dev);
+        for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
+                empty_req_queue(&dev->ep[tmp]);
+
         udc_setup_endpoints(dev);
 }
 
@@ -2472,6 +2476,13 @@ static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
                                 }
                         }
 
+                } else if (!use_dma && ep->in) {
+                        /* disable interrupt */
+                        tmp = readl(
+                                &dev->regs->ep_irqmsk);
+                        tmp |= AMD_BIT(ep->num);
+                        writel(tmp,
+                                &dev->regs->ep_irqmsk);
                 }
         }
         /* clear status bits */
@@ -3279,6 +3290,17 @@ static int udc_pci_probe(
                 goto finished;
         }
 
+        spin_lock_init(&dev->lock);
+        /* udc csr registers base */
+        dev->csr = dev->virt_addr + UDC_CSR_ADDR;
+        /* dev registers base */
+        dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
+        /* ep registers base */
+        dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
+        /* fifo's base */
+        dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
+        dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
+
         if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
                 dev_dbg(&dev->pdev->dev, "request_irq(%d) fail\n", pdev->irq);
                 kfree(dev);
@@ -3331,7 +3353,6 @@ static int udc_probe(struct udc *dev)
         udc_pollstall_timer.data = 0;
 
         /* device struct setup */
-        spin_lock_init(&dev->lock);
         dev->gadget.ops = &udc_ops;
 
         dev_set_name(&dev->gadget.dev, "gadget");
@@ -3340,16 +3361,6 @@ static int udc_probe(struct udc *dev)
         dev->gadget.name = name;
         dev->gadget.is_dualspeed = 1;
 
-        /* udc csr registers base */
-        dev->csr = dev->virt_addr + UDC_CSR_ADDR;
-        /* dev registers base */
-        dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
-        /* ep registers base */
-        dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
-        /* fifo's base */
-        dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
-        dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
-
         /* init registers, interrupts, ... */
         startup_registers(dev);
 
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 9835e0713943..f5f5601701c9 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -28,6 +28,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/timer.h>
+#include <linux/ktime.h>
 #include <linux/list.h>
 #include <linux/interrupt.h>
 #include <linux/usb.h>
@@ -676,6 +677,7 @@ static int ehci_run (struct usb_hcd *hcd)
         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
         msleep(5);
         up_write(&ehci_cf_port_reset_rwsem);
+        ehci->last_periodic_enable = ktime_get_real();
 
         temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
         ehci_info (ehci,
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 378861b9d79a..ead5f4f2aa5a 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -111,6 +111,10 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
         switch (pdev->vendor) {
         case PCI_VENDOR_ID_INTEL:
                 ehci->need_io_watchdog = 0;
+                if (pdev->device == 0x27cc) {
+                        ehci->broken_periodic = 1;
+                        ehci_info(ehci, "using broken periodic workaround\n");
+                }
                 break;
         case PCI_VENDOR_ID_TDI:
                 if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 00ad9ce392ed..139a2cc3f641 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -487,8 +487,20 @@ halt:
                          * we must clear the TT buffer (11.17.5).
                          */
                         if (unlikely(last_status != -EINPROGRESS &&
-                                        last_status != -EREMOTEIO))
-                                ehci_clear_tt_buffer(ehci, qh, urb, token);
+                                        last_status != -EREMOTEIO)) {
+                                /* The TT's in some hubs malfunction when they
+                                 * receive this request following a STALL (they
+                                 * stop sending isochronous packets).  Since a
+                                 * STALL can't leave the TT buffer in a busy
+                                 * state (if you believe Figures 11-48 - 11-51
+                                 * in the USB 2.0 spec), we won't clear the TT
+                                 * buffer in this case.  Strictly speaking this
+                                 * is a violation of the spec.
+                                 */
+                                if (last_status != -EPIPE)
+                                        ehci_clear_tt_buffer(ehci, qh, urb,
+                                                        token);
+                        }
                 }
 
                 /* if we're removing something not at the queue head,
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index b25cdea93a1f..a5535b5e3fe2 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -475,6 +475,8 @@ static int enable_periodic (struct ehci_hcd *ehci)
         /* make sure ehci_work scans these */
         ehci->next_uframe = ehci_readl(ehci, &ehci->regs->frame_index)
                 % (ehci->periodic_size << 3);
+        if (unlikely(ehci->broken_periodic))
+                ehci->last_periodic_enable = ktime_get_real();
         return 0;
 }
 
@@ -486,6 +488,16 @@ static int disable_periodic (struct ehci_hcd *ehci)
         if (--ehci->periodic_sched)
                 return 0;
 
+        if (unlikely(ehci->broken_periodic)) {
+                /* delay experimentally determined */
+                ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 1000);
+                ktime_t now = ktime_get_real();
+                s64 delay = ktime_us_delta(safe, now);
+
+                if (unlikely(delay > 0))
+                        udelay(delay);
+        }
+
         /* did setting PSE not take effect yet?
          * takes effect only at frame boundaries...
          */
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 064e76821ff5..2d85e21ff282 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -118,6 +118,7 @@ struct ehci_hcd {			/* one per controller */
         unsigned                stamp;
         unsigned                random_frame;
         unsigned long           next_statechange;
+        ktime_t                 last_periodic_enable;
         u32                     command;
 
         /* SILICON QUIRKS */
@@ -127,6 +128,7 @@ struct ehci_hcd {			/* one per controller */
         unsigned                big_endian_desc:1;
         unsigned                has_amcc_usb23:1;
         unsigned                need_io_watchdog:1;
+        unsigned                broken_periodic:1;
 
         /* required for usb32 quirk */
         #define OHCI_CTRL_HCFS          (3 << 6)
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 78bb7710f36d..24eb74781919 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -87,6 +87,7 @@ static int ohci_restart (struct ohci_hcd *ohci);
 #ifdef CONFIG_PCI
 static void quirk_amd_pll(int state);
 static void amd_iso_dev_put(void);
+static void sb800_prefetch(struct ohci_hcd *ohci, int on);
 #else
 static inline void quirk_amd_pll(int state)
 {
@@ -96,6 +97,10 @@ static inline void amd_iso_dev_put(void)
 {
         return;
 }
+static inline void sb800_prefetch(struct ohci_hcd *ohci, int on)
+{
+        return;
+}
 #endif
 
 
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index d2ba04dd785e..b8a1148f248e 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -177,6 +177,13 @@ static int ohci_quirk_amd700(struct usb_hcd *hcd)
                 return 0;
 
         pci_read_config_byte(amd_smbus_dev, PCI_REVISION_ID, &rev);
+
+        /* SB800 needs pre-fetch fix */
+        if ((rev >= 0x40) && (rev <= 0x4f)) {
+                ohci->flags |= OHCI_QUIRK_AMD_PREFETCH;
+                ohci_dbg(ohci, "enabled AMD prefetch quirk\n");
+        }
+
         if ((rev > 0x3b) || (rev < 0x30)) {
                 pci_dev_put(amd_smbus_dev);
                 amd_smbus_dev = NULL;
@@ -262,6 +269,19 @@ static void amd_iso_dev_put(void)
 
 }
 
+static void sb800_prefetch(struct ohci_hcd *ohci, int on)
+{
+        struct pci_dev *pdev;
+        u16 misc;
+
+        pdev = to_pci_dev(ohci_to_hcd(ohci)->self.controller);
+        pci_read_config_word(pdev, 0x50, &misc);
+        if (on == 0)
+                pci_write_config_word(pdev, 0x50, misc & 0xfcff);
+        else
+                pci_write_config_word(pdev, 0x50, misc | 0x0300);
+}
+
 /* List of quirks for OHCI */
 static const struct pci_device_id ohci_pci_quirks[] = {
         {
diff --git a/drivers/usb/host/ohci-q.c b/drivers/usb/host/ohci-q.c
index 16fecb8ecc39..35288bcae0db 100644
--- a/drivers/usb/host/ohci-q.c
+++ b/drivers/usb/host/ohci-q.c
@@ -49,9 +49,12 @@ __acquires(ohci->lock)
         switch (usb_pipetype (urb->pipe)) {
         case PIPE_ISOCHRONOUS:
                 ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs--;
-                if (ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0
-                                && quirk_amdiso(ohci))
-                        quirk_amd_pll(1);
+                if (ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0) {
+                        if (quirk_amdiso(ohci))
+                                quirk_amd_pll(1);
+                        if (quirk_amdprefetch(ohci))
+                                sb800_prefetch(ohci, 0);
+                }
                 break;
         case PIPE_INTERRUPT:
                 ohci_to_hcd(ohci)->self.bandwidth_int_reqs--;
@@ -680,9 +683,12 @@ static void td_submit_urb (
                                 data + urb->iso_frame_desc [cnt].offset,
                                 urb->iso_frame_desc [cnt].length, urb, cnt);
                 }
-                if (ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0
-                                && quirk_amdiso(ohci))
-                        quirk_amd_pll(0);
+                if (ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0) {
+                        if (quirk_amdiso(ohci))
+                                quirk_amd_pll(0);
+                        if (quirk_amdprefetch(ohci))
+                                sb800_prefetch(ohci, 1);
+                }
                 periodic = ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs++ == 0
                         && ohci_to_hcd(ohci)->self.bandwidth_int_reqs == 0;
                 break;
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index 222011f6172c..5bf15fed0d9f 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -402,6 +402,7 @@ struct ohci_hcd {
 #define OHCI_QUIRK_FRAME_NO     0x80                    /* no big endian frame_no shift */
 #define OHCI_QUIRK_HUB_POWER    0x100                   /* distrust firmware power/oc setup */
 #define OHCI_QUIRK_AMD_ISO      0x200                   /* ISO transfers*/
+#define OHCI_QUIRK_AMD_PREFETCH 0x400                   /* pre-fetch for ISO transfer */
         // there are also chip quirks/bugs in init logic
 
         struct work_struct      nec_work;       /* Worker for NEC quirk */
@@ -433,6 +434,10 @@ static inline int quirk_amdiso(struct ohci_hcd *ohci)
 {
         return ohci->flags & OHCI_QUIRK_AMD_ISO;
 }
+static inline int quirk_amdprefetch(struct ohci_hcd *ohci)
+{
+        return ohci->flags & OHCI_QUIRK_AMD_PREFETCH;
+}
 #else
 static inline int quirk_nec(struct ohci_hcd *ohci)
 {
@@ -446,6 +451,10 @@ static inline int quirk_amdiso(struct ohci_hcd *ohci)
 {
         return 0;
 }
+static inline int quirk_amdprefetch(struct ohci_hcd *ohci)
+{
+        return 0;
+}
 #endif
 
 /* convert between an hcd pointer and the corresponding ohci_hcd */
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 1db4fea8c170..b8fd270a8b0d 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -802,9 +802,11 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
         int i;
 
         /* Free the Event Ring Segment Table and the actual Event Ring */
-        xhci_writel(xhci, 0, &xhci->ir_set->erst_size);
-        xhci_write_64(xhci, 0, &xhci->ir_set->erst_base);
-        xhci_write_64(xhci, 0, &xhci->ir_set->erst_dequeue);
+        if (xhci->ir_set) {
+                xhci_writel(xhci, 0, &xhci->ir_set->erst_size);
+                xhci_write_64(xhci, 0, &xhci->ir_set->erst_base);
+                xhci_write_64(xhci, 0, &xhci->ir_set->erst_dequeue);
+        }
         size = sizeof(struct xhci_erst_entry)*(xhci->erst.num_entries);
         if (xhci->erst.entries)
                 pci_free_consistent(pdev, size,
@@ -841,9 +843,9 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
                                 xhci->dcbaa, xhci->dcbaa->dma);
         xhci->dcbaa = NULL;
 
+        scratchpad_free(xhci);
         xhci->page_size = 0;
         xhci->page_shift = 0;
-        scratchpad_free(xhci);
 }
 
 int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 173c39c76489..821b7b4709de 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -864,9 +864,11 @@ static struct xhci_segment *trb_in_td(
         cur_seg = start_seg;
 
         do {
+                if (start_dma == 0)
+                        return 0;
                 /* We may get an event for a Link TRB in the middle of a TD */
                 end_seg_dma = xhci_trb_virt_to_dma(cur_seg,
-                                &start_seg->trbs[TRBS_PER_SEGMENT - 1]);
+                                &cur_seg->trbs[TRBS_PER_SEGMENT - 1]);
                 /* If the end TRB isn't in this segment, this is set to 0 */
                 end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb);
 
@@ -893,8 +895,9 @@ static struct xhci_segment *trb_in_td(
                 }
                 cur_seg = cur_seg->next;
                 start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]);
-        } while (1);
+        } while (cur_seg != start_seg);
 
+        return 0;
 }
 
 /*
diff --git a/drivers/usb/mon/mon_bin.c b/drivers/usb/mon/mon_bin.c
index 9ed3e741bee1..10f3205798e8 100644
--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -348,12 +348,12 @@ static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp,
 
 /*
  * Return a few (kilo-)bytes to the head of the buffer.
- * This is used if a DMA fetch fails.
+ * This is used if a data fetch fails.
  */
 static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size)
 {
 
-        size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
+        /* size &= ~(PKT_ALIGN-1);  -- we're called with aligned size */
         rp->b_cnt -= size;
         if (rp->b_in < size)
                 rp->b_in += rp->b_size;
@@ -433,6 +433,7 @@ static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
         unsigned int urb_length;
         unsigned int offset;
         unsigned int length;
+        unsigned int delta;
         unsigned int ndesc, lendesc;
         unsigned char dir;
         struct mon_bin_hdr *ep;
@@ -537,8 +538,10 @@ static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
         if (length != 0) {
                 ep->flag_data = mon_bin_get_data(rp, offset, urb, length);
                 if (ep->flag_data != 0) {       /* Yes, it's 0x00, not '0' */
-                        ep->len_cap = 0;
-                        mon_buff_area_shrink(rp, length);
+                        delta = (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
+                        ep->len_cap -= length;
+                        delta -= (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
+                        mon_buff_area_shrink(rp, delta);
                 }
         } else {
                 ep->flag_data = data_tag;
diff --git a/drivers/usb/musb/cppi_dma.c b/drivers/usb/musb/cppi_dma.c
index c3577bbbae6c..ef2332a9941d 100644
--- a/drivers/usb/musb/cppi_dma.c
+++ b/drivers/usb/musb/cppi_dma.c
@@ -1442,11 +1442,6 @@ static int cppi_channel_abort(struct dma_channel *channel)
                 musb_writew(regs, MUSB_TXCSR, value);
                 musb_writew(regs, MUSB_TXCSR, value);
 
-                /* re-enable interrupt */
-                if (enabled)
-                        musb_writel(tibase, DAVINCI_TXCPPI_INTENAB_REG,
-                                        (1 << cppi_ch->index));
-
                 /* While we scrub the TX state RAM, ensure that we clean
                  * up any interrupt that's currently asserted:
                  * 1. Write to completion Ptr value 0x1(bit 0 set)
@@ -1459,6 +1454,11 @@ static int cppi_channel_abort(struct dma_channel *channel)
                 cppi_reset_tx(tx_ram, 1);
                 musb_writel(&tx_ram->tx_complete, 0, 0);
 
+                /* re-enable interrupt */
+                if (enabled)
+                        musb_writel(tibase, DAVINCI_TXCPPI_INTENAB_REG,
+                                        (1 << cppi_ch->index));
+
                 cppi_dump_tx(5, cppi_ch, " (done teardown)");
 
                 /* REVISIT tx side _should_ clean up the same way
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 3a61ddb62bd2..547e0e390726 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1450,7 +1450,7 @@ static int __init musb_core_init(u16 musb_type, struct musb *musb)
 #endif
 
                 if (hw_ep->max_packet_sz_tx) {
-                        printk(KERN_DEBUG
+                        DBG(1,
                                 "%s: hw_ep %d%s, %smax %d\n",
                                 musb_driver_name, i,
                                 hw_ep->is_shared_fifo ? "shared" : "tx",
@@ -1459,7 +1459,7 @@ static int __init musb_core_init(u16 musb_type, struct musb *musb)
                                 hw_ep->max_packet_sz_tx);
                 }
                 if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
-                        printk(KERN_DEBUG
+                        DBG(1,
                                 "%s: hw_ep %d%s, %smax %d\n",
                                 musb_driver_name, i,
                                 "rx",
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 8b3c4e2ed7b8..74073f9a43f0 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -4,6 +4,7 @@
  * Copyright 2005 Mentor Graphics Corporation
  * Copyright (C) 2005-2006 by Texas Instruments
  * Copyright (C) 2006-2007 Nokia Corporation
+ * Copyright (C) 2009 MontaVista Software, Inc. <source@mvista.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -436,14 +437,6 @@ void musb_g_tx(struct musb *musb, u8 epnum)
                         csr |= MUSB_TXCSR_P_WZC_BITS;
                         csr &= ~MUSB_TXCSR_P_SENTSTALL;
                         musb_writew(epio, MUSB_TXCSR, csr);
-                        if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
-                                dma->status = MUSB_DMA_STATUS_CORE_ABORT;
-                                musb->dma_controller->channel_abort(dma);
-                        }
-
-                        if (request)
-                                musb_g_giveback(musb_ep, request, -EPIPE);
-
                         break;
                 }
 
@@ -582,15 +575,25 @@ void musb_g_tx(struct musb *musb, u8 epnum)
  */
 static void rxstate(struct musb *musb, struct musb_request *req)
 {
-        u16                     csr = 0;
         const u8                epnum = req->epnum;
         struct usb_request      *request = &req->request;
         struct musb_ep          *musb_ep = &musb->endpoints[epnum].ep_out;
         void __iomem            *epio = musb->endpoints[epnum].regs;
         unsigned                fifo_count = 0;
         u16                     len = musb_ep->packet_sz;
+        u16                     csr = musb_readw(epio, MUSB_RXCSR);
 
-        csr = musb_readw(epio, MUSB_RXCSR);
+        /* We shouldn't get here while DMA is active, but we do... */
+        if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
+                DBG(4, "DMA pending...\n");
+                return;
+        }
+
+        if (csr & MUSB_RXCSR_P_SENDSTALL) {
+                DBG(5, "%s stalling, RXCSR %04x\n",
+                    musb_ep->end_point.name, csr);
+                return;
+        }
 
         if (is_cppi_enabled() && musb_ep->dma) {
                 struct dma_controller   *c = musb->dma_controller;
@@ -761,19 +764,10 @@ void musb_g_rx(struct musb *musb, u8 epnum)
                         csr, dma ? " (dma)" : "", request);
 
         if (csr & MUSB_RXCSR_P_SENTSTALL) {
-                if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
-                        dma->status = MUSB_DMA_STATUS_CORE_ABORT;
-                        (void) musb->dma_controller->channel_abort(dma);
-                        request->actual += musb_ep->dma->actual_len;
-                }
-
                 csr |= MUSB_RXCSR_P_WZC_BITS;
                 csr &= ~MUSB_RXCSR_P_SENTSTALL;
                 musb_writew(epio, MUSB_RXCSR, csr);
-
-                if (request)
-                        musb_g_giveback(musb_ep, request, -EPIPE);
-                goto done;
+                return;
         }
 
         if (csr & MUSB_RXCSR_P_OVERRUN) {
@@ -795,7 +789,7 @@ void musb_g_rx(struct musb *musb, u8 epnum)
                 DBG((csr & MUSB_RXCSR_DMAENAB) ? 4 : 1,
                         "%s busy, csr %04x\n",
                         musb_ep->end_point.name, csr);
-                goto done;
+                return;
         }
 
         if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
@@ -826,22 +820,15 @@ void musb_g_rx(struct musb *musb, u8 epnum)
                 if ((request->actual < request->length)
                                 && (musb_ep->dma->actual_len
                                         == musb_ep->packet_sz))
-                        goto done;
+                        return;
 #endif
                 musb_g_giveback(musb_ep, request, 0);
 
                 request = next_request(musb_ep);
                 if (!request)
-                        goto done;
-
-                /* don't start more i/o till the stall clears */
-                musb_ep_select(mbase, epnum);
-                csr = musb_readw(epio, MUSB_RXCSR);
-                if (csr & MUSB_RXCSR_P_SENDSTALL)
-                        goto done;
+                        return;
         }
 
-
         /* analyze request if the ep is hot */
         if (request)
                 rxstate(musb, to_musb_request(request));
@@ -849,8 +836,6 @@ void musb_g_rx(struct musb *musb, u8 epnum)
                 DBG(3, "packet waiting for %s%s request\n",
                                 musb_ep->desc ? "" : "inactive ",
                                 musb_ep->end_point.name);
-
-done:
         return;
 }
 
@@ -1244,7 +1229,7 @@ int musb_gadget_set_halt(struct usb_ep *ep, int value)
         void __iomem            *mbase;
         unsigned long           flags;
         u16                     csr;
-        struct musb_request     *request = NULL;
+        struct musb_request     *request;
         int                     status = 0;
 
         if (!ep)
@@ -1260,24 +1245,29 @@ int musb_gadget_set_halt(struct usb_ep *ep, int value)
 
         musb_ep_select(mbase, epnum);
 
-        /* cannot portably stall with non-empty FIFO */
         request = to_musb_request(next_request(musb_ep));
-        if (value && musb_ep->is_in) {
-                csr = musb_readw(epio, MUSB_TXCSR);
-                if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
-                        DBG(3, "%s fifo busy, cannot halt\n", ep->name);
-                        spin_unlock_irqrestore(&musb->lock, flags);
-                        return -EAGAIN;
+        if (value) {
+                if (request) {
+                        DBG(3, "request in progress, cannot halt %s\n",
+                            ep->name);
+                        status = -EAGAIN;
+                        goto done;
+                }
+                /* Cannot portably stall with non-empty FIFO */
+                if (musb_ep->is_in) {
+                        csr = musb_readw(epio, MUSB_TXCSR);
+                        if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
+                                DBG(3, "FIFO busy, cannot halt %s\n", ep->name);
+                                status = -EAGAIN;
+                                goto done;
+                        }
                 }
-
         }
 
         /* set/clear the stall and toggle bits */
         DBG(2, "%s: %s stall\n", ep->name, value ? "set" : "clear");
         if (musb_ep->is_in) {
                 csr = musb_readw(epio, MUSB_TXCSR);
-                if (csr & MUSB_TXCSR_FIFONOTEMPTY)
-                        csr |= MUSB_TXCSR_FLUSHFIFO;
                 csr |= MUSB_TXCSR_P_WZC_BITS
                         | MUSB_TXCSR_CLRDATATOG;
                 if (value)
@@ -1300,14 +1290,13 @@ int musb_gadget_set_halt(struct usb_ep *ep, int value)
                 musb_writew(epio, MUSB_RXCSR, csr);
         }
 
-done:
-
         /* maybe start the first request in the queue */
         if (!musb_ep->busy && !value && request) {
                 DBG(3, "restarting the request\n");
                 musb_ep_restart(musb, request);
         }
 
+done:
         spin_unlock_irqrestore(&musb->lock, flags);
         return status;
 }
diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c
index 7a6778675ad3..522efb31b56b 100644
--- a/drivers/usb/musb/musb_gadget_ep0.c
+++ b/drivers/usb/musb/musb_gadget_ep0.c
@@ -511,7 +511,8 @@ static void ep0_txstate(struct musb *musb)
 
         /* update the flags */
         if (fifo_count < MUSB_MAX_END0_PACKET
-                        || request->actual == request->length) {
+                        || (request->actual == request->length
+                                && !request->zero)) {
                 musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT;
                 csr |= MUSB_CSR0_P_DATAEND;
         } else
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index cf94511485f2..e3ab40a966eb 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -1301,8 +1301,11 @@ void musb_host_tx(struct musb *musb, u8 epnum)
                 return;
         } else  if (usb_pipeisoc(pipe) && dma) {
                 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
-                                offset, length))
+                                offset, length)) {
+                        if (is_cppi_enabled() || tusb_dma_omap())
+                                musb_h_tx_dma_start(hw_ep);
                         return;
+                }
         } else  if (tx_csr & MUSB_TXCSR_DMAENAB) {
                 DBG(1, "not complete, but DMA enabled?\n");
                 return;
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 698252a4dc5d..bd254ec97d14 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -50,6 +50,8 @@ static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
 static void cp210x_break_ctl(struct tty_struct *, int);
 static int cp210x_startup(struct usb_serial *);
 static void cp210x_disconnect(struct usb_serial *);
+static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
+static int cp210x_carrier_raised(struct usb_serial_port *p);
 
 static int debug;
 
@@ -143,6 +145,8 @@ static struct usb_serial_driver cp210x_device = {
         .tiocmset               = cp210x_tiocmset,
         .attach                 = cp210x_startup,
         .disconnect             = cp210x_disconnect,
+        .dtr_rts                = cp210x_dtr_rts,
+        .carrier_raised         = cp210x_carrier_raised
 };
 
 /* Config request types */
@@ -746,6 +750,14 @@ static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 }
 
+static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
+{
+        if (on)
+                cp210x_tiocmset_port(p, NULL,  TIOCM_DTR|TIOCM_RTS, 0);
+        else
+                cp210x_tiocmset_port(p, NULL,  0, TIOCM_DTR|TIOCM_RTS);
+}
+
 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
 {
         struct usb_serial_port *port = tty->driver_data;
@@ -768,6 +780,15 @@ static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
         return result;
 }
 
+static int cp210x_carrier_raised(struct usb_serial_port *p)
+{
+        unsigned int control;
+        cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
+        if (control & CONTROL_DCD)
+                return 1;
+        return 0;
+}
+
 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 {
         struct usb_serial_port *port = tty->driver_data;
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 9c60d6d4908a..ebcc6d0e2e91 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1937,7 +1937,7 @@ static void ftdi_write_bulk_callback(struct urb *urb)
                 return;
         }
         /* account for transferred data */
-        countback = urb->actual_length;
+        countback = urb->transfer_buffer_length;
         data_offset = priv->write_offset;
         if (data_offset > 0) {
                 /* Subtract the control bytes */
@@ -1950,7 +1950,6 @@ static void ftdi_write_bulk_callback(struct urb *urb)
 
         if (status) {
                 dbg("nonzero write bulk status received: %d", status);
-                return;
         }
 
         usb_serial_port_softint(port);
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index cd44c68954df..0577e4b61114 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -308,6 +308,7 @@ static int  option_resume(struct usb_serial *serial);
 
 #define DLINK_VENDOR_ID                         0x1186
 #define DLINK_PRODUCT_DWM_652                   0x3e04
+#define DLINK_PRODUCT_DWM_652_U5                0xce16
 
 #define QISDA_VENDOR_ID                         0x1da5
 #define QISDA_PRODUCT_H21_4512                  0x4512
@@ -335,6 +336,10 @@ static int  option_resume(struct usb_serial *serial);
 #define AIRPLUS_VENDOR_ID                       0x1011
 #define AIRPLUS_PRODUCT_MCD650                  0x3198
 
+/* 4G Systems products */
+#define FOUR_G_SYSTEMS_VENDOR_ID                0x1c9e
+#define FOUR_G_SYSTEMS_PRODUCT_W14              0x9603
+
 static struct usb_device_id option_ids[] = {
         { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
         { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA) },
@@ -586,6 +591,7 @@ static struct usb_device_id option_ids[] = {
         { USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, ZTE_PRODUCT_AC2726, 0xff, 0xff, 0xff) },
         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_H10) },
         { USB_DEVICE(DLINK_VENDOR_ID, DLINK_PRODUCT_DWM_652) },
+        { USB_DEVICE(ALINK_VENDOR_ID, DLINK_PRODUCT_DWM_652_U5) }, /* Yes, ALINK_VENDOR_ID */
         { USB_DEVICE(QISDA_VENDOR_ID, QISDA_PRODUCT_H21_4512) },
         { USB_DEVICE(QISDA_VENDOR_ID, QISDA_PRODUCT_H21_4523) },
         { USB_DEVICE(QISDA_VENDOR_ID, QISDA_PRODUCT_H20_4515) },
@@ -597,6 +603,7 @@ static struct usb_device_id option_ids[] = {
         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_X060S) },
         { USB_DEVICE(AIRPLUS_VENDOR_ID, AIRPLUS_PRODUCT_MCD650) },
         { USB_DEVICE(TLAYTECH_VENDOR_ID, TLAYTECH_PRODUCT_TEU800) },
+        { USB_DEVICE(FOUR_G_SYSTEMS_VENDOR_ID, FOUR_G_SYSTEMS_PRODUCT_W14) },
         { } /* Terminating entry */
 };
 MODULE_DEVICE_TABLE(usb, option_ids);