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| author | Daniel Wagner <daniel.wagner@bmw-carit.de> | 2016-09-13 10:58:48 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-09-14 13:19:15 -0400 |
| commit | 3e3f5a8a0f03e5af8a243f6b04cb007068481358 (patch) | |
| tree | 2330613954349d3d074f5dcbde398affaf07ec2a /drivers/scsi | |
| parent | 4086eae52beab7808b8aa1a9f7d4095eebc247c7 (diff) | |
| download | linux-3e3f5a8a0f03e5af8a243f6b04cb007068481358.tar.gz linux-3e3f5a8a0f03e5af8a243f6b04cb007068481358.tar.bz2 linux-3e3f5a8a0f03e5af8a243f6b04cb007068481358.zip | |
scsi: csiostor: Fix completion usage
The (re)initializing of the completion object should be done before we
trigger the transfer. Doing this after triggering the hardware opens up
a race window. Without the timeout we would problaly even deadlock. Use
also reinit_completion because we initalize the whole data structure in
csio_scscim_init().
There is only one waiter for the completion, therefore there is no need
to use complete_all(). Let's make that clear by using complete() instead
of complete_all().
The usage pattern of the completion is:
waiter context waker context
csio_eh_abort_handler()
reinit_completion()
wait_for_completion_timeout()
csio_scsi_err_handler()
complete()
[mkp: fix typo]
Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/csiostor/csio_scsi.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/scsi/csiostor/csio_scsi.c b/drivers/scsi/csiostor/csio_scsi.c index c2a6f9f29427..89a52b941ea8 100644 --- a/drivers/scsi/csiostor/csio_scsi.c +++ b/drivers/scsi/csiostor/csio_scsi.c @@ -1721,7 +1721,7 @@ out: /* Wake up waiting threads */ csio_scsi_cmnd(req) = NULL; - complete_all(&req->cmplobj); + complete(&req->cmplobj); } /* @@ -1945,6 +1945,7 @@ csio_eh_abort_handler(struct scsi_cmnd *cmnd) ready = csio_is_lnode_ready(ln); tmo = CSIO_SCSI_ABRT_TMO_MS; + reinit_completion(&ioreq->cmplobj); spin_lock_irq(&hw->lock); rv = csio_do_abrt_cls(hw, ioreq, (ready ? SCSI_ABORT : SCSI_CLOSE)); spin_unlock_irq(&hw->lock); @@ -1964,8 +1965,6 @@ csio_eh_abort_handler(struct scsi_cmnd *cmnd) goto inval_scmnd; } - /* Wait for completion */ - init_completion(&ioreq->cmplobj); wait_for_completion_timeout(&ioreq->cmplobj, msecs_to_jiffies(tmo)); /* FW didnt respond to abort within our timeout */ |