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From: Linus Walleij <>
To: Ricardo Ribalda Delgado <>,
	Grygorii Strashko <>,
	Roger Quadros <>
Cc: Alexandre Courbot <>,
	"" <>,
	"" <>
Subject: Re: [PATCH 2/2] gpiolib: Fix unaligned used of reference counters
Date: Wed, 8 Jun 2016 10:41:37 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Fri, Jun 3, 2016 at 7:10 PM, Ricardo Ribalda Delgado
<> wrote:

> gpiolib relies on the reference counters to clean up the gpio_device
> structure.
> Although the number of get/put is properly aligned on gpiolib.c
> itself, it does not take into consideration how the referece counters
> are affected by other external functions such as cdev_add and device_add.
> Because of this, after the last call to put_device, the reference counter
> has a value of +3, therefore never calling gpiodevice_release.
> Due to the fact that some of the device  has already been cleaned on
> gpiochip_remove, the library will end up OOPsing the kernel (e.g. a call
> to of_gpiochip_find_and_xlate).
> Signed-off-by: Ricardo Ribalda Delgado <>

Again, thanks for fixing my stupid mistakes.

Applied and tagged for stable.

Linus Walleij

  reply	other threads:[~2016-06-08  8:54 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-03 17:10 [PATCH 1/2] gpiolib: Fix NULL pointer deference Ricardo Ribalda Delgado
2016-06-03 17:10 ` [PATCH 2/2] gpiolib: Fix unaligned used of reference counters Ricardo Ribalda Delgado
2016-06-08  8:41   ` Linus Walleij [this message]
2016-06-08  8:39 ` [PATCH 1/2] gpiolib: Fix NULL pointer deference Linus Walleij
2016-06-08  9:46   ` Grygorii Strashko

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