linux-kernel - Re: [PATCH 4.19 09/78] iio: adc: mcp3422: fix locking on error path

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Message-ID: <20200916073100.GA32537@duo.ucw.cz>
Date:   Wed, 16 Sep 2020 09:31:00 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Angelo Compagnucci <angelo.compagnucci@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 09/78] iio: adc: mcp3422: fix locking on error path

Hi!

> [ Upstream commit a139ffa40f0c24b753838b8ef3dcf6ad10eb7854 ]
> 
> Reading from the chip should be unlocked on error path else the lock
> could never being released.
> 
> Fixes: 07914c84ba30 ("iio: adc: Add driver for Microchip MCP3422/3/4 high resolution ADC")
> Fixes: 3f1093d83d71 ("iio: adc: mcp3422: fix locking scope")

Well, 3f1093d83d71 is only applied later in the stable series, so this
introduces spurious unlock.

Ideally this should go just after 3f1093d83d71 ("iio: adc: mcp3422:
fix locking scope").

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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