From: Aaron Lu <aaron.lu@intel.com>
To: Sujit Reddy Thumma <sthumma@codeaurora.org>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-pm@vger.kernel.org, linux-scsi@vger.kernel.org,
stable@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org,
'James Bottomley' <James.Bottomley@HansenPartnership.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] block: Fix possible sleep in invalid context
Date: Tue, 02 Jul 2013 11:04:22 +0800 [thread overview]
Message-ID: <51D24336.5020504@intel.com> (raw)
In-Reply-To: <1372692515-31969-1-git-send-email-sthumma@codeaurora.org>
On 07/01/2013 11:28 PM, Sujit Reddy Thumma wrote:
> When block runtime PM is enabled following warning is seen
> while resuming the device.
>
> BUG: sleeping function called from invalid context at
> .../drivers/base/power/runtime.c:923
> in_atomic(): 1, irqs_disabled(): 128, pid: 12, name: kworker/0:1
> [<c0014448>] (unwind_backtrace+0x0/0x120) from
> [<c03120e4>] (__pm_runtime_suspend+0x34/0xa0) from
> [<c021c33c>] (blk_post_runtime_resume+0x4c/0x5c) from
> [<c03297cc>] (scsi_runtime_resume+0x90/0xb4) from
> [<c0310940>] (__rpm_callback+0x30/0x58) from
> [<c0310980>] (rpm_callback+0x18/0x28) from
> [<c0311ab0>] (rpm_resume+0x3dc/0x540) from
> [<c03120a4>] (pm_runtime_work+0x8c/0x98) from
> [<c007767c>] (process_one_work+0x238/0x3e4) from
> [<c0077b90>] (worker_thread+0x1ac/0x2ac) from
> [<c007cfdc>] (kthread+0x88/0x94) from
> [<c000ece0>] (kernel_thread_exit+0x0/0x8)
>
> Fix this by releasing spin_lock_irq() before calling
> pm_runtime_autosuspend() in blk_post_runtime_resume().
Hi Sujit,
Thanks for testing out block layer runtime PM!
As for the problem here, it is already fixed by:
commit c60855cdb976c632b3bf8922eeab8a0e78edfc04
Author: Aaron Lu <aaron.lu@intel.com>
Date: Fri May 17 15:47:20 2013 +0800
blkpm: avoid sleep when holding queue lock
-Aaron
>
> Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
> Cc: stable@vger.kernel.org
> ---
> block/blk-core.c | 6 ++++--
> 1 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/block/blk-core.c b/block/blk-core.c
> index 33c33bc..2456116 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -3159,16 +3159,18 @@ EXPORT_SYMBOL(blk_pre_runtime_resume);
> */
> void blk_post_runtime_resume(struct request_queue *q, int err)
> {
> - spin_lock_irq(q->queue_lock);
> if (!err) {
> + spin_lock_irq(q->queue_lock);
> q->rpm_status = RPM_ACTIVE;
> __blk_run_queue(q);
> pm_runtime_mark_last_busy(q->dev);
> + spin_unlock_irq(q->queue_lock);
> pm_runtime_autosuspend(q->dev);
> } else {
> + spin_lock_irq(q->queue_lock);
> q->rpm_status = RPM_SUSPENDED;
> + spin_unlock_irq(q->queue_lock);
> }
> - spin_unlock_irq(q->queue_lock);
> }
> EXPORT_SYMBOL(blk_post_runtime_resume);
> #endif
>
next prev parent reply other threads:[~2013-07-02 3:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-01 15:28 [PATCH] block: Fix possible sleep in invalid context Sujit Reddy Thumma
2013-07-01 22:17 ` Andrew Morton
2013-07-01 22:24 ` James Bottomley
2013-07-01 22:30 ` Andrew Morton
2013-07-02 3:04 ` Aaron Lu [this message]
2013-07-02 3:27 ` Sujit Reddy Thumma
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=51D24336.5020504@intel.com \
--to=aaron.lu@intel.com \
--cc=James.Bottomley@HansenPartnership.com \
--cc=akpm@linux-foundation.org \
--cc=axboe@kernel.dk \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=stable@vger.kernel.org \
--cc=sthumma@codeaurora.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).