Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firewire: document the sysfs ABIs
  firewire: cdev: ABI documentation enhancements
  firewire: cdev: prevent race between first get_info ioctl and bus reset event queuing
  firewire: cdev: return -ENOTTY for unimplemented ioctls, not -EINVAL
  firewire: ohci: skip soft reset retries after card ejection
  firewire: ohci: fix PHY reg access after card ejection
  firewire: ohci: add a comment on PHY reg access serialization
  firewire: ohci: reduce potential context_stop latency
  firewire: ohci: remove superfluous posted write flushes
  firewire: net: replacing deprecated __attribute__((packed)) with __packed

1 files changed, 27 insertions, 15 deletions

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index ebb897329c1e..bcf792fac442 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -253,7 +253,6 @@ static inline struct fw_ohci *fw_ohci(struct fw_card *card)
 #define OHCI1394_MAX_PHYS_RESP_RETRIES  0x8
 
 #define OHCI1394_REGISTER_SIZE          0x800
-#define OHCI_LOOP_COUNT                 500
 #define OHCI1394_PCI_HCI_Control        0x40
 #define SELF_ID_BUF_SIZE                0x800
 #define OHCI_TCODE_PHY_PACKET           0x0e
@@ -514,6 +513,12 @@ static inline void flush_writes(const struct fw_ohci *ohci)
         reg_read(ohci, OHCI1394_Version);
 }
 
+/*
+ * Beware!  read_phy_reg(), write_phy_reg(), update_phy_reg(), and
+ * read_paged_phy_reg() require the caller to hold ohci->phy_reg_mutex.
+ * In other words, only use ohci_read_phy_reg() and ohci_update_phy_reg()
+ * directly.  Exceptions are intrinsically serialized contexts like pci_probe.
+ */
 static int read_phy_reg(struct fw_ohci *ohci, int addr)
 {
         u32 val;
@@ -522,6 +527,9 @@ static int read_phy_reg(struct fw_ohci *ohci, int addr)
         reg_write(ohci, OHCI1394_PhyControl, OHCI1394_PhyControl_Read(addr));
         for (i = 0; i < 3 + 100; i++) {
                 val = reg_read(ohci, OHCI1394_PhyControl);
+                if (!~val)
+                        return -ENODEV; /* Card was ejected. */
+
                 if (val & OHCI1394_PhyControl_ReadDone)
                         return OHCI1394_PhyControl_ReadData(val);
 
@@ -545,6 +553,9 @@ static int write_phy_reg(const struct fw_ohci *ohci, int addr, u32 val)
                   OHCI1394_PhyControl_Write(addr, val));
         for (i = 0; i < 3 + 100; i++) {
                 val = reg_read(ohci, OHCI1394_PhyControl);
+                if (!~val)
+                        return -ENODEV; /* Card was ejected. */
+
                 if (!(val & OHCI1394_PhyControl_WritePending))
                         return 0;
 
@@ -630,7 +641,6 @@ static void ar_context_link_page(struct ar_context *ctx, unsigned int index)
         ctx->last_buffer_index = index;
 
         reg_write(ctx->ohci, CONTROL_SET(ctx->regs), CONTEXT_WAKE);
-        flush_writes(ctx->ohci);
 }
 
 static void ar_context_release(struct ar_context *ctx)
@@ -1002,7 +1012,6 @@ static void ar_context_run(struct ar_context *ctx)
 
         reg_write(ctx->ohci, COMMAND_PTR(ctx->regs), ctx->descriptors_bus | 1);
         reg_write(ctx->ohci, CONTROL_SET(ctx->regs), CONTEXT_RUN);
-        flush_writes(ctx->ohci);
 }
 
 static struct descriptor *find_branch_descriptor(struct descriptor *d, int z)
@@ -1202,14 +1211,14 @@ static void context_stop(struct context *ctx)
 
         reg_write(ctx->ohci, CONTROL_CLEAR(ctx->regs), CONTEXT_RUN);
         ctx->running = false;
-        flush_writes(ctx->ohci);
 
-        for (i = 0; i < 10; i++) {
+        for (i = 0; i < 1000; i++) {
                 reg = reg_read(ctx->ohci, CONTROL_SET(ctx->regs));
                 if ((reg & CONTEXT_ACTIVE) == 0)
                         return;
 
-                mdelay(1);
+                if (i)
+                        udelay(10);
         }
         fw_error("Error: DMA context still active (0x%08x)\n", reg);
 }
@@ -1346,12 +1355,10 @@ static int at_context_queue_packet(struct context *ctx,
 
         context_append(ctx, d, z, 4 - z);
 
-        if (ctx->running) {
+        if (ctx->running)
                 reg_write(ohci, CONTROL_SET(ctx->regs), CONTEXT_WAKE);
-                flush_writes(ohci);
-        } else {
+        else
                 context_run(ctx, 0);
-        }
 
         return 0;
 }
@@ -1960,14 +1967,18 @@ static irqreturn_t irq_handler(int irq, void *data)
 
 static int software_reset(struct fw_ohci *ohci)
 {
+        u32 val;
         int i;
 
         reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_softReset);
+        for (i = 0; i < 500; i++) {
+                val = reg_read(ohci, OHCI1394_HCControlSet);
+                if (!~val)
+                        return -ENODEV; /* Card was ejected. */
 
-        for (i = 0; i < OHCI_LOOP_COUNT; i++) {
-                if ((reg_read(ohci, OHCI1394_HCControlSet) &
-                     OHCI1394_HCControl_softReset) == 0)
+                if (!(val & OHCI1394_HCControl_softReset))
                         return 0;
+
                 msleep(1);
         }
 
@@ -2197,7 +2208,9 @@ static int ohci_enable(struct fw_card *card,
                   OHCI1394_LinkControl_rcvPhyPkt);
 
         ar_context_run(&ohci->ar_request_ctx);
-        ar_context_run(&ohci->ar_response_ctx); /* also flushes writes */
+        ar_context_run(&ohci->ar_response_ctx);
+
+        flush_writes(ohci);
 
         /* We are ready to go, reset bus to finish initialization. */
         fw_schedule_bus_reset(&ohci->card, false, true);
@@ -3129,7 +3142,6 @@ static void ohci_flush_queue_iso(struct fw_iso_context *base)
                         &container_of(base, struct iso_context, base)->context;
 
         reg_write(ctx->ohci, CONTROL_SET(ctx->regs), CONTEXT_WAKE);
-        flush_writes(ctx->ohci);
 }
 
 static const struct fw_card_driver ohci_driver = {