linux-kernel - [PATCH 1/2] sched/wait: Add wait_event_lock_irq_timeout for TASK

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Date:   Wed, 10 Oct 2018 03:23:09 +0000
From:   "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:     target-devel <target-devel@...r.kernel.org>
Cc:     linux-scsi <linux-scsi@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Mike Christie <mchristi@...hat.com>,
        Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Nicholas Bellinger <nab@...ux-iscsi.org>,
        Bart Van Assche <bvanassche@....org>
Subject: [PATCH 1/2] sched/wait: Add wait_event_lock_irq_timeout for TASK_UNINTERRUPTIBLE usage

From: Nicholas Bellinger <nab@...ux-iscsi.org>

Short of reverting commit 00d909a107 for v4.19, target-core needs a
wait_event_t marco can be executed using TASK_UNINTERRUPTIBLE to
function correctly with existing fabric drivers that expect to run
with signals pending during session shutdown and active se_cmd I/O
quiesce.

The most notable is iscsi-target/iser-target, while ibmvscsi_tgt invokes
session shutdown logic from userspace via configfs attribute that could
also potentially have signals pending.

So go ahead and introduce wait_event_lock_irq_timeout() to achieve this,
and update + rename __wait_event_lock_irq_timeout() to make it accept
'state' as a parameter.

Fixes: 00d909a107 ("scsi: target: Make the session shutdown code also wait for commands that are being aborted")
Cc: Bart Van Assche <bvanassche@....org>
Cc: Mike Christie <mchristi@...hat.com>
Cc: Hannes Reinecke <hare@...e.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>
Cc: Bryant G. Ly <bryantly@...ux.vnet.ibm.com>
Cc: Peter Zijlstra (Intel) <peterz@...radead.org>
Tested-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
---
 include/linux/wait.h | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/include/linux/wait.h b/include/linux/wait.h
index d9f131e..ed7c122 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -1052,10 +1052,9 @@ void __wake_up_locked_key_bookmark(struct wait_queue_head *wq_head,
 	__ret;									\
 })
 
-#define __wait_event_interruptible_lock_irq_timeout(wq_head, condition,		\
-						    lock, timeout)		\
+#define __wait_event_lock_irq_timeout(wq_head, condition, lock, timeout, state)	\
 	___wait_event(wq_head, ___wait_cond_timeout(condition),			\
-		      TASK_INTERRUPTIBLE, 0, timeout,				\
+		      state, 0, timeout,					\
 		      spin_unlock_irq(&lock);					\
 		      __ret = schedule_timeout(__ret);				\
 		      spin_lock_irq(&lock));
@@ -1089,8 +1088,19 @@ void __wake_up_locked_key_bookmark(struct wait_queue_head *wq_head,
 ({										\
 	long __ret = timeout;							\
 	if (!___wait_cond_timeout(condition))					\
-		__ret = __wait_event_interruptible_lock_irq_timeout(		\
-					wq_head, condition, lock, timeout);	\
+		__ret = __wait_event_lock_irq_timeout(				\
+					wq_head, condition, lock, timeout,	\
+					TASK_INTERRUPTIBLE);			\
+	__ret;									\
+})
+
+#define wait_event_lock_irq_timeout(wq_head, condition, lock, timeout)		\
+({										\
+	long __ret = timeout;							\
+	if (!___wait_cond_timeout(condition))					\
+		__ret = __wait_event_lock_irq_timeout(				\
+					wq_head, condition, lock, timeout,	\
+					TASK_UNINTERRUPTIBLE);			\
 	__ret;									\
 })
 
-- 
1.9.1