linux-kernel - Re: [PATCH] HID: hiddev: fix returned errno code in hiddev

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Message-ID: <alpine.LNX.2.00.1509302138380.30132@pobox.suse.cz>
Date:	Wed, 30 Sep 2015 21:40:29 +0200 (CEST)
From:	Jiri Kosina <jikos@...nel.org>
To:	Luis de Bethencourt <luisbg@....samsung.com>
cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-input@...r.kernel.org
Subject: Re: [PATCH] HID: hiddev: fix returned errno code in
 hiddev_connect()

On Wed, 30 Sep 2015, Luis de Bethencourt wrote:

> The driver is using -1 instead of the -ENOMEM defined macro to specify
> that a buffer allocation failed. Since the error number is propagated,
> the caller will get a -EPERM which is the wrong error condition.

Generally I agree that the more specific errno, the better.

But I am not really sure where you are seeing the bug (mapping to -EPERM) 
in this case? I think the only caller of hiddev_connect() should be 
hid_connect(), and the only thing that guy cares about whether individual 
callbacks succeed or fail, so that it sets hdev->clamed flags accordingly.

Could you please be more specific about the -EPERM mapping you are talking 
about?

Thanks,

-- 
Jiri Kosina
SUSE Labs

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