From: Jiang Yi Date: Sun, 25 Jun 2017 19:28:50 +0000 (-0700) Subject: target: Fix COMPARE_AND_WRITE caw_sem leak during se_cmd quiesce X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8d832513726d1ac8a2f443dbdec1d8de58d43c48;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git target: Fix COMPARE_AND_WRITE caw_sem leak during se_cmd quiesce commit 1d6ef276594a781686058802996e09c8550fd767 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 Signed-off-by: Nicholas Bellinger Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 37c77db6e737..f71bedea973a 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -728,6 +728,15 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) if (cmd->transport_state & CMD_T_ABORTED || cmd->transport_state & CMD_T_STOP) { spin_unlock_irqrestore(&cmd->t_state_lock, flags); + /* + * If COMPARE_AND_WRITE was stopped by __transport_wait_for_tasks(), + * release se_device->caw_sem obtained by sbc_compare_and_write() + * since target_complete_ok_work() or target_complete_failure_work() + * won't be called to invoke the normal CAW completion callbacks. + */ + if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { + up(&dev->caw_sem); + } complete_all(&cmd->t_transport_stop_comp); return; } else if (!success) {