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[SCSI] ibmvscsi: Fix possible request_limit issue

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If we encounter an error when sending a management datagram (i.e. non
SCSI command, such as virtual adapter initialization command), we
end up incrementing the request_limit, even though we don't decrement
it for these commands. Fix this up by doing this increment in
the error path for SRP commands only.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Brian King 2010-06-17 13:56:03 -05:00 committed by James Bottomley
parent 1117ef8aed
commit f3a9c4d76a
1 changed files with 5 additions and 2 deletions
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7
drivers/scsi/ibmvscsi/ibmvscsi.c
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@ -548,6 +548,7 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
int request_status = 0;
int rc;
int srp_req = 0;
/* If we have exhausted our request limit, just fail this request,
* unless it is for a reset or abort.
@ -556,6 +557,7 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
* can handle more requests (can_queue) when we actually can't
*/
if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
srp_req = 1;
request_status =
atomic_dec_if_positive(&hostdata->request_limit);
/* If request limit was -1 when we started, it is now even
@ -630,7 +632,8 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
goto send_busy;
}
dev_err(hostdata->dev, "send error %d\n", rc);
atomic_inc(&hostdata->request_limit);
if (srp_req)
atomic_inc(&hostdata->request_limit);
goto send_error;
}
@ -640,7 +643,7 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
free_event_struct(&hostdata->pool, evt_struct);
if (request_status != -1)
if (srp_req && request_status != -1)
atomic_inc(&hostdata->request_limit);
return SCSI_MLQUEUE_HOST_BUSY;