linux-kernel - Re: [PATCH] Bluetooth: hidp: Fix assumptions on the return value of hidp_send

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Message-ID: <20190906111117.GB14147@kadam>
Date:   Fri, 6 Sep 2019 14:11:17 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Dan Elkouby <streetwalkermc@...il.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Brian Norris <computersforpeace@...il.com>,
        Fabian Henneke <fabian.henneke@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: hidp: Fix assumptions on the return value of
 hidp_send_message

On Fri, Sep 06, 2019 at 02:06:44PM +0300, Dan Elkouby wrote:
> hidp_send_message was changed to return non-zero values on success,
> which some other bits did not expect. This caused spurious errors to be
> propagated through the stack, breaking some drivers, such as hid-sony
> for the Dualshock 4 in Bluetooth mode.
> 
> As pointed out by Dan Carpenter, hid-microsoft directly relied on that
> assumption as well.
> 
> Fixes: 48d9cc9d85dd ("Bluetooth: hidp: Let hidp_send_message return number of queued bytes")
> 
> Signed-off-by: Dan Elkouby <streetwalkermc@...il.com>

Thanks!

Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>

regards,
dan carpenter