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authorAlan Stern <stern@rowland.harvard.edu>2010-03-18 15:39:30 -0400
committerJames Bottomley <James.Bottomley@suse.de>2010-05-25 11:00:56 -0500
commitf9e8894ae5157796dd69249c56062042d02a431d (patch)
treecfc0f34d22771525330b995a2f58655bdd5aaa04 /drivers/scsi/scsi_scan.c
parent8a52da632ceb9d8b776494563df579e87b7b586b (diff)
[SCSI] fix race in scsi_target_reap
This patch (as1357) fixes a race in SCSI target allocation and release. Putting a target in the STARGET_DEL state isn't protected by the host lock, so an old target structure could be reused by a new device even though it's about to be deleted. The cure is to change the state while still holding the host lock. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/scsi_scan.c')
-rw-r--r--drivers/scsi/scsi_scan.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index c992ecf4e37..a77468cd5a3 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -492,19 +492,20 @@ void scsi_target_reap(struct scsi_target *starget)
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
unsigned long flags;
enum scsi_target_state state;
- int empty;
+ int empty = 0;
spin_lock_irqsave(shost->host_lock, flags);
state = starget->state;
- empty = --starget->reap_ref == 0 &&
- list_empty(&starget->devices) ? 1 : 0;
+ if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
+ empty = 1;
+ starget->state = STARGET_DEL;
+ }
spin_unlock_irqrestore(shost->host_lock, flags);
if (!empty)
return;
BUG_ON(state == STARGET_DEL);
- starget->state = STARGET_DEL;
if (state == STARGET_CREATED)
scsi_target_destroy(starget);
else