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

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Date:   Thu, 11 Oct 2018 19:18:01 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     "Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
        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>
Subject: Re: [PATCH 1/2] sched/wait: Add wait_event_lock_irq_timeout for
 TASK_UNINTERRUPTIBLE usage

On 10/9/18 8:23 PM, Nicholas A. Bellinger wrote:
> 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>

Reviewed-by: Bart Van Assche <bvanassche@....org>