Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 09 Jul 2015 11:40:40 -0600 | From | Shuah Khan <> | Subject | Re: Linux 4.2-rc1 |
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On 07/09/2015 08:45 AM, Greg Kroah-Hartman wrote: > On Thu, Jul 09, 2015 at 07:44:04AM -0600, Shuah Khan wrote: >> On 07/09/2015 07:10 AM, Shuah Khan wrote: >>> On 07/08/2015 09:17 PM, Linus Torvalds wrote: >>>> On Wed, Jul 8, 2015 at 5:58 PM, Ming Lei <ming.lei@canonical.com> wrote: >>>>> On Thu, Jul 9, 2015 at 1:29 AM, Linus Torvalds >>>>> <torvalds@linux-foundation.org> wrote: >>>>>> Also, it looks like you need to hold the "fw_lock" to even look at >>>>>> that pointer, since the buffer can get reallocated etc. >>>>> >>>>> Yes, the above code with holding 'fw_lock' is right fix for the issue since >>>>> sysfs read can happen anytime, and there is one race between firmware >>>>> request abort and reading uevent of sysfs. >>>> >>>> So if fw_priv->buf is NULL, what should we do? >>>> >>>> Should we skip the TIMEOUT= and ASYNC= fields too? >>>> >>>> Something like the attached, perhaps? >>>> >>>> Shuah, how reproducible is this? Does this (completely untested) patch >>>> make any difference? >>>> >>> >>> Happened both times I booted 4.2-rc1 up, so I would say 100% so far. >>> I will test with your patch and report results. >>> >> >> Yes. This patch fixed the problem. > > That's great, but what changed recently to cause this problem to happen? > Any chance you can bisect to the problem commit? >
:) Starting bisect now. Thankfully I built 4.1.0 in this tree which is good place to start. Let you know in a bit
-- Shuah
-- Shuah Khan Sr. Linux Kernel Developer Open Source Innovation Group Samsung Research America (Silicon Valley) shuahkh@osg.samsung.com | (970) 217-8978
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