target: Fix COMPARE_AND_WRITE caw_sem leak during se_cmd quiesce
commit 1d6ef27659
upstream.
This patch addresses a COMPARE_AND_WRITE se_device->caw_sem leak,
that would be triggered during normal se_cmd shutdown or abort
via __transport_wait_for_tasks().
This would occur because target_complete_cmd() would catch this
early and do complete_all(&cmd->t_transport_stop_comp), but since
target_complete_ok_work() or target_complete_failure_work() are
never called to invoke se_cmd->transport_complete_callback(),
the COMPARE_AND_WRITE specific callbacks never release caw_sem.
To address this special case, go ahead and release caw_sem
directly from target_complete_cmd().
(Remove '&& success' from check, to release caw_sem regardless
of scsi_status - nab)
Signed-off-by: Jiang Yi <jiangyilism@gmail.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
steinar/wifi_calib_4_9_kernel
parent
fa67ac18ef
commit
672145dfae
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@ -753,6 +753,15 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
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if (cmd->transport_state & CMD_T_ABORTED ||
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cmd->transport_state & CMD_T_STOP) {
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spin_unlock_irqrestore(&cmd->t_state_lock, flags);
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/*
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* If COMPARE_AND_WRITE was stopped by __transport_wait_for_tasks(),
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* release se_device->caw_sem obtained by sbc_compare_and_write()
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* since target_complete_ok_work() or target_complete_failure_work()
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* won't be called to invoke the normal CAW completion callbacks.
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*/
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if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
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up(&dev->caw_sem);
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}
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complete_all(&cmd->t_transport_stop_comp);
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return;
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} else if (!success) {
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