esp_scsi: fix reset cleanup spinlock recursion

The esp_reset_cleanup() function is called with the host lock held and
invokes starget_for_each_device() which wants to take it too.  Here is a
fix along the lines of shost_for_each_device()/__shost_for_each_device()
adding a __starget_for_each_device() counterpart which assumes the lock
has already been taken.

Eventually, I think the driver should get modified so that more work is
done as a softirq rather than in the interrupt context, but for now it
fixes a bug that causes the spinlock debugger to fire.

While at it, it fixes a small number of cosmetic problems with
starget_for_each_device() too.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c
index 4ed3a52..bfdee59 100644 (file)
--- a/drivers/scsi/esp_scsi.c
+++ b/drivers/scsi/esp_scsi.c
@@ -2026,8 +2026,8 @@ static void esp_reset_cleanup(struct esp *esp)
                tp->flags |= ESP_TGT_CHECK_NEGO;
 
                if (tp->starget)
-                       starget_for_each_device(tp->starget, NULL,
-                                               esp_clear_hold);
+                       __starget_for_each_device(tp->starget, NULL,
+                                                 esp_clear_hold);
        }
        esp->flags &= ~ESP_FLAG_RESETTING;
 }

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 1929488..0fb1709 100644 (file)
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -896,11 +896,11 @@ EXPORT_SYMBOL(__scsi_iterate_devices);
  * starget_for_each_device  -  helper to walk all devices of a target
  * @starget:   target whose devices we want to iterate over.
  *
- * This traverses over each devices of @shost.  The devices have
+ * This traverses over each device of @starget.  The devices have
  * a reference that must be released by scsi_host_put when breaking
  * out of the loop.
  */
-void starget_for_each_device(struct scsi_target *starget, void * data,
+void starget_for_each_device(struct scsi_target *starget, void *data,
                     void (*fn)(struct scsi_device *, void *))
 {
        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
@@ -914,6 +914,33 @@ void starget_for_each_device(struct scsi_target *starget, void * data,
 }
 EXPORT_SYMBOL(starget_for_each_device);
 
+/**
+ * __starget_for_each_device  -  helper to walk all devices of a target
+ *                              (UNLOCKED)
+ * @starget:   target whose devices we want to iterate over.
+ *
+ * This traverses over each device of @starget.  It does _not_
+ * take a reference on the scsi_device, so the whole loop must be
+ * protected by shost->host_lock.
+ *
+ * Note:  The only reason why drivers would want to use this is because
+ * they need to access the device list in irq context.  Otherwise you
+ * really want to use starget_for_each_device instead.
+ **/
+void __starget_for_each_device(struct scsi_target *starget, void *data,
+                              void (*fn)(struct scsi_device *, void *))
+{
+       struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+       struct scsi_device *sdev;
+
+       __shost_for_each_device(sdev, shost) {
+               if ((sdev->channel == starget->channel) &&
+                   (sdev->id == starget->id))
+                       fn(sdev, data);
+       }
+}
+EXPORT_SYMBOL(__starget_for_each_device);
+
 /**
  * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED)
  * @starget:   SCSI target pointer

diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 66e9058..6c2d80b 100644 (file)
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -242,6 +242,9 @@ extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
                                                          uint);
 extern void starget_for_each_device(struct scsi_target *, void *,
                     void (*fn)(struct scsi_device *, void *));
+extern void __starget_for_each_device(struct scsi_target *, void *,
+                                     void (*fn)(struct scsi_device *,
+                                                void *));
 
 /* only exposed to implement shost_for_each_device */
 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,