From: Rabin Vincent <rabin@rab.in>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Chanho Min <chanho0207@gmail.com>, Jens Axboe <axboe@kernel.dk>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/backing-dev.c: fix crash when USB/SCSI device is detached
Date: Sun, 15 Jan 2012 21:11:07 +0530 [thread overview]
Message-ID: <20120115153838.GA4279@debian> (raw)
In-Reply-To: <20120115125853.GA9234@localhost>
On Sun, Jan 15, 2012 at 08:58:53PM +0800, Wu Fengguang wrote:
> On Sun, Jan 15, 2012 at 03:58:43PM +0530, Rabin Vincent wrote:
> > diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> > index 71034f4..a39ad70 100644
> > --- a/mm/backing-dev.c
> > +++ b/mm/backing-dev.c
> > @@ -318,7 +318,7 @@ static void wakeup_timer_fn(unsigned long data)
> > if (bdi->wb.task) {
> > trace_writeback_wake_thread(bdi);
> > wake_up_process(bdi->wb.task);
> > - } else {
> > + } else if (bdi->dev) {
> > /*
> > * When bdi tasks are inactive for long time, they are killed.
> > * In this case we have to wake-up the forker thread which
> > @@ -584,6 +584,8 @@ EXPORT_SYMBOL(bdi_register_dev);
> > */
> > static void bdi_wb_shutdown(struct backing_dev_info *bdi)
> > {
> > + struct task_struct *task = NULL;
>
> NULL not necessary?
Will fix.
Also, I notice another problem here. bdi->dev should be made NULL before the
device is unregistered, not after:
if (!bdi_cap_flush_forker(bdi))
bdi_wb_shutdown(bdi);
bdi_debug_unregister(bdi);
device_unregister(bdi->dev);
bdi->dev = NULL;
next prev parent reply other threads:[~2012-01-15 15:42 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-05 8:49 [PATCH] mm/backing-dev.c: fix crash when USB/SCSI device is detached Chanho Min
2012-01-15 10:28 ` Rabin Vincent
2012-01-15 12:58 ` Wu Fengguang
2012-01-15 15:41 ` Rabin Vincent [this message]
2012-01-16 2:53 ` Wu Fengguang
2012-01-16 5:28 ` Chanho Min
2012-01-16 5:50 ` Wu Fengguang
2012-01-16 5:53 ` Wu Fengguang
2012-01-16 6:34 ` Chanho Min
2012-01-18 19:43 ` Rabin Vincent
2012-01-19 16:50 ` [PATCHv2] backing-dev: fix wakeup timer races with bdi_unregister() Rabin Vincent
2012-01-19 23:46 ` Namjae Jeon
2012-01-20 5:24 ` Rabin Vincent
2012-01-20 6:15 ` Namjae Jeon
2012-01-20 10:03 ` Rabin Vincent
2012-01-20 11:18 ` Namjae Jeon
2012-01-20 12:08 ` Rabin Vincent
2012-01-20 15:04 ` Namjae Jeon
2012-01-31 13:24 ` Wu Fengguang
[not found] <004401ccc932$444a0070$ccde0150$@min@lge.com>
2012-01-02 9:57 ` [PATCH] mm/backing-dev.c: fix crash when USB/SCSI device is detached Wu Fengguang
[not found] ` <002e01ccc9c7$1928c940$4b7a5bc0$@min@lge.com>
2012-01-03 4:49 ` Wu Fengguang
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