loopback: Fix transport_generic_allocate_tasks error handling
This patch addresses a tcm_loop bug with transport_generic_allocate_tasks()
return checking in tcm_loop_submission_work() where other non zero return
codes (including -EBUSY for reservation conflicts) are incorrectly falling
through to transport_generic_map_mem_to_cmd() -> transport_handle_cdb_direct().
This bug was introduced into target-pending/for-next-merge with the following
for-3.4 commit:
commit 16786454acec0e0e55e32d508b3058b32c1f23f3
Author: Christoph Hellwig <hch@infradead.org>
Date: Thu Feb 2 17:04:42 2012 -0500
tcm_loop: switch to using transport_handle_cdb_direct
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 22f4fe7..a9b4eee 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -233,8 +233,7 @@
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
transport_generic_free_cmd(se_cmd, 0);
return;
- }
- if (ret == -EINVAL) {
+ } else if (ret < 0) {
if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
tcm_loop_queue_status(se_cmd);
else