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IB/srp: Avoid that mapping failure triggers an infinite loop 

The srp_queuecommand() function translates ENOMEM into QUEUE_FULL
which causes the SCSI mid-layer to retry the command. All other
error codes are translated into DID_ERROR which causes the SCSI
command to fail. Return E2BIG if mapping will always fail to
prevent that the SCSI mid-layer keeps resubmitting a command
forever.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Laurence Oberman <loberman@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2016-04-22 14:14:15 -07:00 committed by Doug Ledford
parent fa9863f869
commit ffc548bb36
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/ulp/srp/ib_srp.c
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@ -1681,6 +1681,8 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
unmap:
srp_unmap_data(scmnd, ch, req);
if (ret == -ENOMEM && req->nmdesc >= target->mr_pool_size)
ret = -E2BIG;
return ret;
}