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authorJames Bottomley <James.Bottomley@suse.de>2011-01-27 16:12:37 -0500
committerJames Bottomley <James.Bottomley@suse.de>2011-02-12 10:17:13 -0600
commit563585ec4bf1319f193c2f51682985bcae400cb4 (patch)
treede6d2b98f972fc9a414c5d39638c5c0bc3c4a09a /drivers/scsi
parent3c6c0d6ca386fe7a8e44e887a51f333c2499c829 (diff)
[SCSI] qla2xxx: Fix race that could hang kthread_stop()
There is a small race window in qla2x00_do_dpc() between checking for kthread_should_stop() and going to sleep after setting TASK_INTERRUPTIBLE. If qla2x00_free_device() is called in this window, kthread_stop will wait forever because there will be no one to wake up the process. Fix by making sure we only set TASK_INTERRUPTIBLE before checking kthread_stop(). Reported-by: Bandan Das <bandan.das@stratus.com> Acked-by: Madhuranath Iyengar <Madhu.Iyengar@qlogic.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/qla2xxx/qla_os.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index c194c23ca1f..15ce69eaaf4 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -3282,10 +3282,10 @@ qla2x00_do_dpc(void *data)
set_user_nice(current, -20);
+ set_current_state(TASK_INTERRUPTIBLE);
while (!kthread_should_stop()) {
DEBUG3(printk("qla2x00: DPC handler sleeping\n"));
- set_current_state(TASK_INTERRUPTIBLE);
schedule();
__set_current_state(TASK_RUNNING);
@@ -3454,7 +3454,9 @@ qla2x00_do_dpc(void *data)
qla2x00_do_dpc_all_vps(base_vha);
ha->dpc_active = 0;
+ set_current_state(TASK_INTERRUPTIBLE);
} /* End of while(1) */
+ __set_current_state(TASK_RUNNING);
DEBUG(printk("scsi(%ld): DPC handler exiting\n", base_vha->host_no));