From: Qing Huang <qing.huang@oracle.com>
To: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Grant Likely <grant.likely@linaro.org>,
Santosh Shilimkar <santosh.shilimkar@oracle.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] device probe: add self triggered delayed work request
Date: Mon, 8 Aug 2016 17:10:05 -0700 [thread overview]
Message-ID: <57A91F5D.1060605@oracle.com> (raw)
In-Reply-To: <20160808104250.GA12480@shamir-linux.uk.oracle.com>
On 08/08/2016 03:42 AM, Shamir Rabinovitch wrote:
> Hi Qing,
>
> I suspect there is potential dead-lock with this patch:
>
> cpu0 cpu1
>
> driver_deferred_probe_add deferred_probe_work_func
> ... mutex_unlock(&deferred_probe_mutex)
> mutex_lock(&deferred_probe_mutex) bus_probe_device(dev)
> ... device return -EPROBE_DEFER
> ... driver_deferred_probe_add
> ... mutex_lock(&deferred_probe_mutex)
> ... <deadlock!>
> cancel_delayed_work(&deferred_probe_trigger_work)
> <work will never end - deadlock!>
Not sure if I understood your scenario. Why there is a deadlock here?
>
> Please confirm if this scenario is possible.
>
> BR, Shamir Rabinovitch
next prev parent reply other threads:[~2016-08-09 0:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-08 10:42 [PATCH] device probe: add self triggered delayed work request Shamir Rabinovitch
2016-08-09 0:10 ` Qing Huang [this message]
2016-08-09 10:11 ` Shamir Rabinovitch
2016-08-09 20:57 ` Qing Huang
-- strict thread matches above, loose matches on Subject: below --
2016-07-30 5:39 Qing Huang
2016-08-08 20:44 ` Frank Rowand
2016-08-08 21:51 ` Qing Huang
2016-08-09 1:11 ` Frank Rowand
2016-08-09 1:15 ` Santosh Shilimkar
2016-08-09 7:16 ` Frank Rowand
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