Commit 527268df authored by Nicholas Bellinger's avatar Nicholas Bellinger

target: Re-add missing SCF_ACK_KREF assignment in v4.1.y

This patch fixes a regression in >= v4.1.y code where the original
SCF_ACK_KREF assignment in target_get_sess_cmd() was dropped upstream
in commit 054922bb, but the series for addressing TMR ABORT_TASK +
LUN_RESET with fabric session reinstatement in commit febe562c still
depends on this code in transport_cmd_finish_abort().

The regression manifests itself as a se_cmd->cmd_kref +1 leak, where
ABORT_TASK + LUN_RESET can hang indefinately for a specific I_T session
for drivers using SCF_ACK_KREF, resulting in hung kthreads.

This patch has been verified with v4.1.y code.
Reported-by: default avatarVaibhav Tandon <vst@datera.io>
Tested-by: default avatarVaibhav Tandon <vst@datera.io>
Cc: Vaibhav Tandon <vst@datera.io>
Cc: stable@vger.kernel.org # 4.1+
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent 1a40f0a3
...@@ -2547,8 +2547,10 @@ int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) ...@@ -2547,8 +2547,10 @@ int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
* fabric acknowledgement that requires two target_put_sess_cmd() * fabric acknowledgement that requires two target_put_sess_cmd()
* invocations before se_cmd descriptor release. * invocations before se_cmd descriptor release.
*/ */
if (ack_kref) if (ack_kref) {
kref_get(&se_cmd->cmd_kref); kref_get(&se_cmd->cmd_kref);
se_cmd->se_cmd_flags |= SCF_ACK_KREF;
}
spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
if (se_sess->sess_tearing_down) { if (se_sess->sess_tearing_down) {
......
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