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); } /** -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/