linux-kernel - Re: [PATCH v7 1/2] firmware_loader: use -ETIMEDOUT instead of -EAGAIN in fw_load_sysfs

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Date:   Mon, 26 Jul 2021 10:56:54 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Anirudh Rayabharam <mail@...rudhrb.com>, mcgrof@...nel.org,
        gregkh@...uxfoundation.org, rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v7 1/2] firmware_loader: use -ETIMEDOUT instead of -EAGAIN
 in fw_load_sysfs_fallback

On 7/24/21 6:11 AM, Anirudh Rayabharam wrote:
> The only motivation for using -EAGAIN in commit 0542ad88fbdd81bb
> ("firmware loader: Fix _request_firmware_load() return val for fw load
> abort") was to distinguish the error from -ENOMEM, and so there is no
> real reason in keeping it. -EAGAIN is typically used to tell the
> userspace to try something again and in this case re-using the sysfs
> loading interface cannot be retried when a timeout happens, so the
> return value is also bogus.
> 
> -ETIMEDOUT is received when the wait times out and returning that
> is much more telling of what the reason for the failure was. So, just
> propagate that instead of returning -EAGAIN.
> 
> Suggested-by: Luis Chamberlain <mcgrof@...nel.org>
> Signed-off-by: Anirudh Rayabharam <mail@...rudhrb.com>
> ---
>   drivers/base/firmware_loader/fallback.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c
> index 91899d185e31..1a48be0a030e 100644
> --- a/drivers/base/firmware_loader/fallback.c
> +++ b/drivers/base/firmware_loader/fallback.c
> @@ -535,8 +535,6 @@ static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs, long timeout)
>   	if (fw_state_is_aborted(fw_priv)) {
>   		if (retval == -ERESTARTSYS)
>   			retval = -EINTR;
> -		else
> -			retval = -EAGAIN;
>   	} else if (fw_priv->is_paged_buf && !fw_priv->data)
>   		retval = -ENOMEM;
>   
> 

Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah