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block,scsi: fixup blk_get_request dead queue scenarios

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The blk_get_request function may fail in low-memory conditions or during
device removal (even if __GFP_WAIT is set). To distinguish between these
errors, modify the blk_get_request call stack to return the appropriate
ERR_PTR. Verify that all callers check the return status and consider
IS_ERR instead of a simple NULL pointer check.

For consistency, make a similar change to the blk_mq_alloc_request leg
of blk_get_request.  It may fail if the queue is dead, or the caller was
unwilling to wait.

Signed-off-by: Joe Lawrence <[email protected]>
Acked-by: Jiri Kosina <[email protected]> [for pktdvd]
Acked-by: Boaz Harrosh <[email protected]> [for osd]
Reviewed-by: Jeff Moyer <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Joe Lawrence 2014-08-28 08:15:21 -06:00 • committed by Jens Axboe
commit a492f07545
20 changed files with 55 additions and 51 deletions
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2
drivers/target/target_core_pscsi.c
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@ -1050,7 +1050,7 @@ pscsi_execute_cmd(struct se_cmd *cmd)
req = blk_get_request(pdv->pdv_sd->request_queue,
(data_direction == DMA_TO_DEVICE),
GFP_KERNEL);
if (!req) {
if (IS_ERR(req)) {
pr_err("PSCSI: blk_get_request() failed\n");
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto fail;