linux-kernel - Re: [PATCH 14/27] HID: wacom: EKR: add a worker to add/remove resources on addition/removal (fwd)

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Date:	Wed, 13 Jul 2016 18:01:53 +0200
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	Jiri Kosina <jikos@...nel.org>, Ping Cheng <pinglinux@...il.com>,
	Jason Gerecke <killertofu@...il.com>,
	Aaron Skomra <skomra@...il.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH 14/27] HID: wacom: EKR: add a worker to add/remove
 resources on addition/removal (fwd)

Hi,

On Jul 07 2016 or thereabouts, Julia Lawall wrote:
> The lack of unlock looks suspicious, although I haven't studied the
> complete context.  Also, is 0 correct as a return value in an error case?

Yes, the lack of unlock is a bug, but the return value is correct. It
was not an error but a boolean controlling an action from the caller. It
was a weird think to do and misleading so I just turned the function
into a void one in v2 (to be sent in a few minutes).

Cheers,
Benjamin

> 
> julia
> 
> ---------- Forwarded message ----------
> Date: Wed, 6 Jul 2016 00:27:34 +0800
> From: kbuild test robot <fengguang.wu@...el.com>
> To: kbuild@...org
> Cc: Julia Lawall <julia.lawall@...6.fr>
> Subject: Re: [PATCH 14/27] HID: wacom: EKR: add a worker to add/remove resources
>      on addition/removal
> 
> CC: kbuild-all@...org
> In-Reply-To: <1467729563-23318-15-git-send-email-benjamin.tissoires@...hat.com>
> TO: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> CC: Jiri Kosina <jikos@...nel.org>, Ping Cheng <pinglinux@...il.com>, Jason Gerecke <killertofu@...il.com>, Aaron Skomra <skomra@...il.com>, Peter Hutterer <peter.hutterer@...-t.net>
> CC: linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
> 
> Hi,
> 
> [auto build test WARNING on hid/for-next]
> [also build test WARNING on v4.7-rc6 next-20160705]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> 
> url:    https://github.com/0day-ci/linux/commits/Benjamin-Tissoires/HID-wacom-cleanup-EKR-LED/20160705-225431
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid.git for-next
> :::::: branch date: 2 hours ago
> :::::: commit date: 2 hours ago
> 
> >> drivers/hid/wacom_wac.c:851:2-8: preceding lock on line 846
> 
> git remote add linux-review https://github.com/0day-ci/linux
> git remote update linux-review
> git checkout cbd7a16fa28311673663974b9edc48bd00d83815
> vim +851 drivers/hid/wacom_wac.c
> 
> 72b236d6 Aaron Skomra       2015-08-20  840  		bool connected = data[j+2];
> 72b236d6 Aaron Skomra       2015-08-20  841
> cbd7a16f Benjamin Tissoires 2016-07-05  842  		remote_data.remote[i].serial = serial;
> cbd7a16f Benjamin Tissoires 2016-07-05  843  		remote_data.remote[i].connected = connected;
> 72b236d6 Aaron Skomra       2015-08-20  844  	}
> 72b236d6 Aaron Skomra       2015-08-20  845
> cbd7a16f Benjamin Tissoires 2016-07-05 @846  	spin_lock_irqsave(&wacom->remote_lock, flags);
> 72b236d6 Aaron Skomra       2015-08-20  847
> cbd7a16f Benjamin Tissoires 2016-07-05  848  	ret = kfifo_in(&wacom->remote_fifo, &remote_data, sizeof(remote_data));
> cbd7a16f Benjamin Tissoires 2016-07-05  849  	if (ret != sizeof(remote_data)) {
> cbd7a16f Benjamin Tissoires 2016-07-05  850  		hid_err(wacom->hdev, "Can't queue Remote status event.\n");
> cbd7a16f Benjamin Tissoires 2016-07-05 @851  		return 0;
> 72b236d6 Aaron Skomra       2015-08-20  852  	}
> 72b236d6 Aaron Skomra       2015-08-20  853
> cbd7a16f Benjamin Tissoires 2016-07-05  854  	spin_unlock_irqrestore(&wacom->remote_lock, flags);
> 
> ---
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