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authorNicholas Bellinger <nab@linux-iscsi.org>2017-09-29 16:43:11 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2017-11-07 19:45:28 -0800
commit9574a497df2bbc0a676b609ce0dd24d237cee3a6 (patch)
tree73459de4d7ed7b76647ee6b4c2dc896c2f1c8941 /drivers/target
parentfd2f928b0ddd2fe8876d4f1344df2ace2b715a4d (diff)
target: Fix quiese during transport_write_pending_qf endless loop
This patch fixes a potential end-less loop during QUEUE_FULL, where cmd->se_tfo->write_pending() callback fails repeatedly but __transport_wait_for_tasks() has already been invoked to quiese the outstanding se_cmd descriptor. To address this bug, this patch adds a CMD_T_STOP|CMD_T_ABORTED check within transport_write_pending_qf() and invokes the existing se_cmd->t_transport_stop_comp to signal quiese completion back to __transport_wait_for_tasks(). Cc: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Cc: Michael Cyr <mikecyr@linux.vnet.ibm.com> Cc: Potnuri Bharat Teja <bharat@chelsio.com> Cc: Sagi Grimberg <sagi@grimberg.me> Cc: stable@vger.kernel.org # 4.11+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_transport.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index d02218c71dd6..0e89db84b200 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2560,7 +2560,20 @@ EXPORT_SYMBOL(transport_generic_new_cmd);
static void transport_write_pending_qf(struct se_cmd *cmd)
{
+ unsigned long flags;
int ret;
+ bool stop;
+
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ stop = (cmd->transport_state & (CMD_T_STOP | CMD_T_ABORTED));
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
+ if (stop) {
+ pr_debug("%s:%d CMD_T_STOP|CMD_T_ABORTED for ITT: 0x%08llx\n",
+ __func__, __LINE__, cmd->tag);
+ complete_all(&cmd->t_transport_stop_comp);
+ return;
+ }
ret = cmd->se_tfo->write_pending(cmd);
if (ret) {