linux-kernel - Re: [RESEND][PATCH] ALSA: info: Fix llseek return value when using callback

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Date:   Wed, 17 Aug 2022 14:56:05 +0200
From:   Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>
To:     Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org
Cc:     Cezary Rojewski <cezary.rojewski@...el.com>,
        linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>
Subject: Re: [RESEND][PATCH] ALSA: info: Fix llseek return value when using
 callback

On 8/17/2022 2:49 PM, Amadeusz Sławiński wrote:
> When using callback there was a flow of
> 
> 	ret = -EINVAL
> 	if (callback) {
> 		offset = callback();
> 		goto out;
> 	}
> 	...
> 	offset = some other value in case of no callback;
> 	ret = offset;
> out:
> 	return ret;
> 
> which causes the snd_info_entry_llseek() to return -EINVAL when there is
> callback handler. Fix this by setting "ret" directly to callback return
> value before jumping to "out".
> 
> 73029e0ff18d ("ALSA: info - Implement common llseek for binary mode")
> Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@...ux.intel.com>
> ---
>   sound/core/info.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/core/info.c b/sound/core/info.c
> index b8058b341178..0b2f04dcb589 100644
> --- a/sound/core/info.c
> +++ b/sound/core/info.c
> @@ -111,9 +111,9 @@ static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
>   	entry = data->entry;
>   	mutex_lock(&entry->access);
>   	if (entry->c.ops->llseek) {
> -		offset = entry->c.ops->llseek(entry,
> -					      data->file_private_data,
> -					      file, offset, orig);
> +		ret = entry->c.ops->llseek(entry,
> +					   data->file_private_data,
> +					   file, offset, orig);
>   		goto out;
>   	}
>   

Doing resend, because I did copy paste mistake when pasting Takashi 
email to git command, additionally alsa-devel blocked my previous mail.
I've seen that Cezary already discussed this issue, and it doesn't seem 
to be fixed, can this be somehow investigated? I guess we can provide 
response we get from server when email fails?

For example lkml accepted both messages just fine...
previous mail:
https://lore.kernel.org/lkml/20220817124642.3974015-1-amadeuszx.slawinski@linux.intel.com/T/#u
and resend:
https://lore.kernel.org/lkml/20220817124924.3974577-1-amadeuszx.slawinski@linux.intel.com/T/#u