From: Bodo Stroesser bstroesser@ts.fujitsu.com
commit f2e6b75f6ee82308ef7b00f29e71e5f1c6b3d52a upstream.
Testing with Loopback I found that, after a Loopback LUN has executed a TMR, I can no longer unlink the LUN. The rm command hangs in transport_clear_lun_ref() at wait_for_completion(&lun->lun_shutdown_comp) The reason is, that transport_lun_remove_cmd() is not called at the end of target_tmr_work().
It seems, that in other fabrics this call happens implicitly when the fabric drivers call transport_generic_free_cmd() during their ->queue_tm_rsp().
Unfortunately Loopback seems to not comply to the common way of calling transport_generic_free_cmd() from ->queue_*(). Instead it calls transport_generic_free_cmd() from its ->check_stop_free() only.
But the ->check_stop_free() is called by transport_cmd_check_stop_to_fabric() after it has reset the se_cmd->se_lun pointer. Therefore the following transport_generic_free_cmd() skips the transport_lun_remove_cmd().
So this patch re-adds the transport_lun_remove_cmd() at the end of target_tmr_work(), which was removed during commit 2c9fa49e100f ("scsi: target/core: Make ABORT and LUN RESET handling synchronous").
For fabrics using transport_generic_free_cmd() in the usual way the double call to transport_lun_remove_cmd() doesn't harm, as transport_lun_remove_cmd() checks for this situation and does not release lun_ref twice.
Link: https://lore.kernel.org/r/20200513153443.3554-1-bstroesser@ts.fujitsu.com Fixes: 2c9fa49e100f ("scsi: target/core: Make ABORT and LUN RESET handling synchronous") Cc: stable@vger.kernel.org Tested-by: Bryant G. Ly bryangly@gmail.com Reviewed-by: Bart van Assche bvanassche@acm.org Signed-off-by: Bodo Stroesser bstroesser@ts.fujitsu.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/target/target_core_transport.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -3349,6 +3349,7 @@ static void target_tmr_work(struct work_
cmd->se_tfo->queue_tm_rsp(cmd);
+ transport_lun_remove_cmd(cmd); transport_cmd_check_stop_to_fabric(cmd); return;