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authorTejun Heo <htejun@gmail.com>2005-05-13 17:46:08 +0200
committerJames Bottomley <jejb@mulgrave.(none)>2005-05-20 19:53:54 +0200
commitd8c37e7b9a619855e05d5d4e56c68f799b1f539c (patch)
treef32bcada38a55c16b8c0040043cd0ee087f48aec
parent[SCSI] remove spurious if tests from scsi_eh_{times_out|done} (diff)
downloadlinux-d8c37e7b9a619855e05d5d4e56c68f799b1f539c.tar.xz
linux-d8c37e7b9a619855e05d5d4e56c68f799b1f539c.zip
[SCSI] remove a timer race in scsi_queue_insert()
scsi_queue_insert() has four callers. Three callers call with timer disabled and one (the second invocation in scsi_dispatch_cmd()) calls with timer activated. scsi_queue_insert() used to always call scsi_delete_timer() and ignore the return value. This results in race with timer expiration. Remove scsi_delete_timer() call from scsi_queue_insert() and make the caller delete timer and check the return value. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
-rw-r--r--drivers/scsi/scsi.c10
-rw-r--r--drivers/scsi/scsi_lib.c8
2 files changed, 7 insertions, 11 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 05d2bd075fd4..0d730f646bce 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -638,10 +638,12 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
}
spin_unlock_irqrestore(host->host_lock, flags);
if (rtn) {
- atomic_inc(&cmd->device->iodone_cnt);
- scsi_queue_insert(cmd,
- (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ?
- rtn : SCSI_MLQUEUE_HOST_BUSY);
+ if (scsi_delete_timer(cmd)) {
+ atomic_inc(&cmd->device->iodone_cnt);
+ scsi_queue_insert(cmd,
+ (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ?
+ rtn : SCSI_MLQUEUE_HOST_BUSY);
+ }
SCSI_LOG_MLQUEUE(3,
printk("queuecommand : request rejected\n"));
}
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index c3bb28c3feef..9f996499fa9d 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -128,13 +128,7 @@ int scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
printk("Inserting command %p into mlqueue\n", cmd));
/*
- * We are inserting the command into the ml queue. First, we
- * cancel the timer, so it doesn't time out.
- */
- scsi_delete_timer(cmd);
-
- /*
- * Next, set the appropriate busy bit for the device/host.
+ * Set the appropriate busy bit for the device/host.
*
* If the host/device isn't busy, assume that something actually
* completed, and that we should be able to queue a command now.