linux-kernel - Re: [PATCH V7 2/4] rpmsg: Guard against null endpoint ops in destroy

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Date:   Fri, 7 Aug 2020 17:33:53 -0700
From:   Chris Lew <clew@...eaurora.org>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Deepak Kumar Singh <deesin@...eaurora.org>
Cc:     bjorn.andersson@...aro.org, mathieu.poirier@...aro.org,
        Arun Kumar Neelakantam <aneela@...eaurora.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        "open list:REMOTE PROCESSOR MESSAGING (RPMSG) SUBSYSTEM" 
        <linux-remoteproc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V7 2/4] rpmsg: Guard against null endpoint ops in destroy

Hi Greg,

On 8/7/2020 12:59 AM, Greg KH wrote:
> On Wed, Jun 24, 2020 at 10:15:19PM +0530, Deepak Kumar Singh wrote:
>> From: Chris Lew <clew@...eaurora.org>
>>
>> In RPMSG GLINK the chrdev device will allocate an ept as part of the
>> rpdev creation. This device will not register endpoint ops even though
>> it has an allocated ept. Protect against the case where the device is
>> being destroyed.
>>
>> Signed-off-by: Chris Lew <clew@...eaurora.org>
>> Signed-off-by: Deepak Kumar Singh <deesin@...eaurora.org>
>> Signed-off-by: Arun Kumar Neelakantam <aneela@...eaurora.org>
> 
> Should this be marked for stable kernels?
> 
> And if so, what commit does this fix?  Any reason the Fixes: tag was not
> used here?
> 

The crash that this fixes doesn't show up unless one of the previous 
patches in the series is applied.

[PATCH V6 3/5] rpmsg: glink: Add support for rpmsg glink chrdev

I'm not sure if the fixes tag should apply to this change or one of the 
commits to the base rpmsg code.

> And what happened to this series?  I don't see it in linux-next, did the
> maintainer ignore it?
> 

I believe most of the review feedback for the series has been addressed 
by Deepak. There is one remaining action item for me and Deepak to 
provide more concrete evidence that the first patch in the series is 
needed.

[PATCH V6 1/5] rpmsg: glink: Use complete_all for open states

> thanks,
> 
> greg k-h
> 

Thanks,
Chris

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