3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nicholas Bellinger <n...@linux-iscsi.org>
commit e13d5fef88c40b87c8430f8274c3a9ca32ef90bc upstream.
Fabric drivers currently expect to internally release se_cmd in the event
of a TMR failure during target_submit_tmr(), which means the immediate call
to transport_generic_free_cmd() after TFO->queue_tm_rsp() from within
target_complete_tmr_failure() workqueue context is wrong.
This is done as some fabrics expect TMR operations to be acknowledged
before releasing the descriptor, so the assumption that core is releasing
se_cmd associated TMR memory is incorrect. This fixes a OOPs where
transport_generic_free_cmd() was being called more than once.
This bug was originally observed with tcm_qla2xxx fabric ports.
Signed-off-by: Nicholas Bellinger <n...@linux-iscsi.org>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Roland Dreier <rol...@purestorage.com>
Cc: Andy Grover <agro...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/target/target_core_transport.c | 1 -
1 file changed, 1 deletion(-)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1748,7 +1748,6 @@ static void target_complete_tmr_failure(
se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
se_cmd->se_tfo->queue_tm_rsp(se_cmd);
- transport_generic_free_cmd(se_cmd, 0);
}
/**
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