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Subject: Re: linux-next: umh: fix processed error when UMH_WAIT_PROC is used
 seems to break linux bridge on s390x (bisected)
From:   Christian Borntraeger <borntraeger@de.ibm.com>
To:     Luis Chamberlain <mcgrof@kernel.org>
Cc:     Christoph Hellwig <hch@infradead.org>, ast@kernel.org,
        axboe@kernel.dk, bfields@fieldses.org,
        bridge@lists.linux-foundation.org, chainsaw@gentoo.org,
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Message-ID: <fd88506a-bde9-0e63-3473-6b15ed8dbaa2@de.ibm.com>
Date:   Thu, 25 Jun 2020 15:26:43 +0200
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On 24.06.20 20:37, Christian Borntraeger wrote:
> 
> 
> On 24.06.20 20:32, Christian Borntraeger wrote:
> [...]> 
>> So the translations look correct. But your change is actually a sematic change
>> if(ret) will only trigger if there is an error
>> if (KWIFEXITED(ret)) will always trigger when the process ends. So we will always overwrite -ECHILD
>> and we did not do it before. 
>>
> 
> So the right fix is
> 
> diff --git a/kernel/umh.c b/kernel/umh.c
> index f81e8698e36e..a3a3196e84d1 100644
> --- a/kernel/umh.c
> +++ b/kernel/umh.c
> @@ -154,7 +154,7 @@ static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info)
>                  * the real error code is already in sub_info->retval or
>                  * sub_info->retval is 0 anyway, so don't mess with it then.
>                  */
> -               if (KWIFEXITED(ret))
> +               if (KWEXITSTATUS(ret))
>                         sub_info->retval = KWEXITSTATUS(ret);
>         }

Ping. Shall I send this as a proper patch or are we merging this fixup in Andrews patch queue?