From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Linus Walleij <linusw@kernel.org>,
Bartosz Golaszewski <brgl@kernel.org>,
Andy Shevchenko <andy@kernel.org>,
Janusz Krzysztofik <jmkrzyszt@gmail.com>,
linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 2/7] gpiolib: fix fast-path cancellation in gpiod_get_array()
Date: Wed, 4 Nov 2026 14:09:32 +0200 [thread overview]
Message-ID: <ausgfFandlNVa2pJ@ashevche-desk.local> (raw)
In-Reply-To: <20261103-b4-gpiolib-free-v2-2-ea46767c9cf8@gmail.com>
On Tue, Nov 03, 2026 at 07:40:30PM -0800, Dmitry Torokhov wrote:
> In gpiod_get_array(), when a pin on the same chip is not in hardware
> order and the preceding pins form a contiguous block, the fast path is
> cancelled by setting array_info to NULL. However, descs->info was
> already populated with the array_info pointer during the first
> iteration, leaving descs->info pointing to the aborted array_info.
> Consequently, subsequent array operations still use the fast path with
> remaining bits set in the masks and wrong hardware pin numbers.
>
> Clear descs->info alongside array_info when cancelling the fast path so
> callers do not erroneously use the aborted array_info.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2026-11-04 12:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-04 3:40 [PATCH v2 0/7] gpiolib: scope-based management and cleanup for GPIO descriptor arrays Dmitry Torokhov
2026-11-04 3:40 ` [PATCH v2 1/7] gpiolib: fix GPIO descriptor leak in gpiod_get_array() Dmitry Torokhov
2026-11-04 12:06 ` Andy Shevchenko
2026-11-04 12:08 ` Andy Shevchenko
2026-11-04 3:40 ` [PATCH v2 2/7] gpiolib: fix fast-path cancellation " Dmitry Torokhov
2026-11-04 12:09 ` Andy Shevchenko [this message]
2026-11-04 3:40 ` [PATCH v2 3/7] gpiolib: of: return -ENOENT from of_gpio_count() stub Dmitry Torokhov
2026-11-04 12:07 ` Andy Shevchenko
2026-11-04 3:40 ` [PATCH v2 4/7] gpiolib: add support for scope-based management of GPIO descriptors Dmitry Torokhov
2026-11-04 12:10 ` Andy Shevchenko
2026-11-04 3:40 ` [PATCH v2 5/7] gpiolib: use __free(gpiod_put_array) in gpiod_get_array() Dmitry Torokhov
2026-11-04 12:13 ` Andy Shevchenko
2026-11-04 3:40 ` [PATCH v2 6/7] gpiolib: avoid krealloc() " Dmitry Torokhov
2026-11-04 12:20 ` Andy Shevchenko
2026-11-04 3:40 ` [PATCH v2 7/7] gpiolib: use bitmap_zalloc() for fastpath bitmaps Dmitry Torokhov
2026-11-04 12:17 ` Andy Shevchenko
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