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

3 files changed, 41 insertions, 26 deletions

diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index b1c11775839c..e6ad3bb6c1a6 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -253,14 +253,11 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
         init_waitqueue_head(&client->wait);
         init_waitqueue_head(&client->tx_flush_wait);
         INIT_LIST_HEAD(&client->phy_receiver_link);
+        INIT_LIST_HEAD(&client->link);
         kref_init(&client->kref);
 
         file->private_data = client;
 
-        mutex_lock(&device->client_list_mutex);
-        list_add_tail(&client->link, &device->client_list);
-        mutex_unlock(&device->client_list_mutex);
-
         return nonseekable_open(inode, file);
 }
 
@@ -451,15 +448,20 @@ static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
         if (ret != 0)
                 return -EFAULT;
 
+        mutex_lock(&client->device->client_list_mutex);
+
         client->bus_reset_closure = a->bus_reset_closure;
         if (a->bus_reset != 0) {
                 fill_bus_reset_event(&bus_reset, client);
-                if (copy_to_user(u64_to_uptr(a->bus_reset),
-                                 &bus_reset, sizeof(bus_reset)))
-                        return -EFAULT;
+                ret = copy_to_user(u64_to_uptr(a->bus_reset),
+                                   &bus_reset, sizeof(bus_reset));
         }
+        if (ret == 0 && list_empty(&client->link))
+                list_add_tail(&client->link, &client->device->client_list);
 
-        return 0;
+        mutex_unlock(&client->device->client_list_mutex);
+
+        return ret ? -EFAULT : 0;
 }
 
 static int add_client_resource(struct client *client,
@@ -1583,7 +1585,7 @@ static int dispatch_ioctl(struct client *client,
         if (_IOC_TYPE(cmd) != '#' ||
             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) ||
             _IOC_SIZE(cmd) > sizeof(buffer))
-                return -EINVAL;
+                return -ENOTTY;
 
         if (_IOC_DIR(cmd) == _IOC_READ)
                 memset(&buffer, 0, _IOC_SIZE(cmd));
diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c
index eced1c25bf58..03a7a85d0424 100644
--- a/drivers/firewire/net.c
+++ b/drivers/firewire/net.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/bug.h>
+#include <linux/compiler.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/ethtool.h>
@@ -73,7 +74,7 @@ struct rfc2734_arp {
         __be32 fifo_lo;         /* lo 32bits of sender's FIFO addr      */
         __be32 sip;             /* Sender's IP Address                  */
         __be32 tip;             /* IP Address of requested hw addr      */
-} __attribute__((packed));
+} __packed;
 
 /* This header format is specific to this driver implementation. */
 #define FWNET_ALEN      8
@@ -81,7 +82,7 @@ struct rfc2734_arp {
 struct fwnet_header {
         u8 h_dest[FWNET_ALEN];  /* destination address */
         __be16 h_proto;         /* packet type ID field */
-} __attribute__((packed));
+} __packed;
 
 /* IPv4 and IPv6 encapsulation header */
 struct rfc2734_header {
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 = {