linux-kernel - Re: [PATCH v2] staging: r8188eu: convert rtw_pwr

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Message-ID: <20220726133559.GP2338@kadam>
Date:   Tue, 26 Jul 2022 16:35:59 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Phillip Potter <phil@...lpotter.co.uk>
Cc:     gregkh@...uxfoundation.org, Larry.Finger@...inger.net,
        paskripkin@...il.com, straube.linux@...il.com, martin@...ser.cx,
        abdun.nihaal@...il.com, philipp.g.hortmann@...il.com,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: r8188eu: convert rtw_pwr_wakeup to correct
 error code semantics

On Mon, Jul 25, 2022 at 11:07:45PM +0100, Phillip Potter wrote:
> Convert the rtw_pwr_wakeup function to use 0 on success and an appropriate
> error code on error. For the first failure block where ips_leave is
> invoked, use -ENOMEM as this is the main cause of failure here anyway.
> For the second failure block, use -EBUSY, as it seems the most
> appropriate.
> 
> Finally, within the functions rtw_wx_set_mode, rtw_wx_set_wap,
> rtw_wx_set_scan and rtw_wx_set_essid, pass the error code on from
> rtw_pwr_wakeup as appropriate now that it is converted.
> 
> This gets the driver closer to removal of the non-standard _SUCCESS and
> _FAIL definitions, which are inverted compared to the standard in-kernel
> error code mechanism.
> 
> Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>
> ---
> 
> Changes from V1: Act on feedback from Dan Carpenter:
> * Try to use more appropriate error codes than -EPERM.
> * Revert the places where existing -1 was converted as they are out of
>   scope.
> * Preserve error codes in places where calling function already uses
>   proper negative semantics, so that they can be passed through to the
>   caller.
> 

This is a much better patch, right?  Everything hangs together better.

There are seven callers which need to be updated and all of them are
updated.

Reviewed-by: Dan Carpenter