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| author |   Nicholas Bellinger <nab@linux-iscsi.org> | 2017-09-29 16:43:11 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2017-11-07 19:45:28 -0800 |
| commit | 9574a497df2bbc0a676b609ce0dd24d237cee3a6 (patch) | |
| tree | 73459de4d7ed7b76647ee6b4c2dc896c2f1c8941 /drivers/target | |
| parent | target: Fix caw_sem leak in transport_generic_request_failure (diff) | |
| download | linux-dev-9574a497df2bbc0a676b609ce0dd24d237cee3a6.tar.xz linux-dev-9574a497df2bbc0a676b609ce0dd24d237cee3a6.zip | |
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.c | 13 |
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) { |