firewire: core: log config rom reading errors

If reading or refreshing a config rom fails, also log the actual error
that caused it to fail.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 27 insertions, 15 deletions

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index f9f782afedf2..a3f486fbd7b7 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -481,6 +481,7 @@ static int read_rom(struct fw_device *device,
  * generation changes under us, read_config_rom will fail and get retried.
  * It's better to start all over in this case because the node from which we
  * are reading the ROM may have changed the ROM during the reset.
+ * Returns either a result code or a negative error code.
  */
 static int read_config_rom(struct fw_device *device, int generation)
 {
@@ -488,7 +489,7 @@ static int read_config_rom(struct fw_device *device, int generation)
         const u32 *old_rom, *new_rom;
         u32 *rom, *stack;
         u32 sp, key;
-        int i, end, length, ret = -1;
+        int i, end, length, ret;
 
         rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
                       sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
@@ -502,7 +503,8 @@ static int read_config_rom(struct fw_device *device, int generation)
 
         /* First read the bus info block. */
         for (i = 0; i < 5; i++) {
-                if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
+                ret = read_rom(device, generation, i, &rom[i]);
+                if (ret != RCODE_COMPLETE)
                         goto out;
                 /*
                  * As per IEEE1212 7.2, during initialization, devices can
@@ -512,8 +514,10 @@ static int read_config_rom(struct fw_device *device, int generation)
                  * harddisk).  In that case we just fail, and the
                  * retry mechanism will try again later.
                  */
-                if (i == 0 && rom[i] == 0)
+                if (i == 0 && rom[i] == 0) {
+                        ret = RCODE_BUSY;
                         goto out;
+                }
         }
 
         device->max_speed = device->node->max_speed;
@@ -563,11 +567,14 @@ static int read_config_rom(struct fw_device *device, int generation)
                  */
                 key = stack[--sp];
                 i = key & 0xffffff;
-                if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE))
+                if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) {
+                        ret = -ENXIO;
                         goto out;
+                }
 
                 /* Read header quadlet for the block to get the length. */
-                if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
+                ret = read_rom(device, generation, i, &rom[i]);
+                if (ret != RCODE_COMPLETE)
                         goto out;
                 end = i + (rom[i] >> 16) + 1;
                 if (end > MAX_CONFIG_ROM_SIZE) {
@@ -590,8 +597,8 @@ static int read_config_rom(struct fw_device *device, int generation)
                  * it references another block, and push it in that case.
                  */
                 for (; i < end; i++) {
-                        if (read_rom(device, generation, i, &rom[i]) !=
-                            RCODE_COMPLETE)
+                        ret = read_rom(device, generation, i, &rom[i]);
+                        if (ret != RCODE_COMPLETE)
                                 goto out;
 
                         if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
@@ -619,8 +626,10 @@ static int read_config_rom(struct fw_device *device, int generation)
 
         old_rom = device->config_rom;
         new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
-        if (new_rom == NULL)
+        if (new_rom == NULL) {
+                ret = -ENOMEM;
                 goto out;
+        }
 
         down_write(&fw_device_rwsem);
         device->config_rom = new_rom;
@@ -628,7 +637,7 @@ static int read_config_rom(struct fw_device *device, int generation)
         up_write(&fw_device_rwsem);
 
         kfree(old_rom);
-        ret = 0;
+        ret = RCODE_COMPLETE;
         device->max_rec = rom[2] >> 12 & 0xf;
         device->cmc     = rom[2] >> 30 & 1;
         device->irmc    = rom[2] >> 31 & 1;
@@ -967,15 +976,17 @@ static void fw_device_init(struct work_struct *work)
          * device.
          */
 
-        if (read_config_rom(device, device->generation) < 0) {
+        ret = read_config_rom(device, device->generation);
+        if (ret != RCODE_COMPLETE) {
                 if (device->config_rom_retries < MAX_RETRIES &&
                     atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
                         device->config_rom_retries++;
                         fw_schedule_device_work(device, RETRY_DELAY);
                 } else {
                         if (device->node->link_on)
-                                fw_notice(card, "giving up on Config ROM for node id %x\n",
-                                          device->node_id);
+                                fw_notice(card, "giving up on node %x: reading config rom failed: %s\n",
+                                          device->node_id,
+                                          fw_rcode_string(ret));
                         if (device->node == card->root_node)
                                 fw_schedule_bm_work(card, 0);
                         fw_device_release(&device->device);
@@ -1132,7 +1143,8 @@ static void fw_device_refresh(struct work_struct *work)
          */
         device_for_each_child(&device->device, NULL, shutdown_unit);
 
-        if (read_config_rom(device, device->generation) < 0) {
+        ret = read_config_rom(device, device->generation);
+        if (ret != RCODE_COMPLETE) {
                 if (device->config_rom_retries < MAX_RETRIES &&
                     atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
                         device->config_rom_retries++;
@@ -1159,8 +1171,8 @@ static void fw_device_refresh(struct work_struct *work)
         goto out;
 
  give_up:
-        fw_notice(card, "giving up on refresh of device %s\n",
-                  dev_name(&device->device));
+        fw_notice(card, "giving up on refresh of device %s: %s\n",
+                  dev_name(&device->device), fw_rcode_string(ret));
  gone:
         atomic_set(&device->state, FW_DEVICE_GONE);
         PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);