From: Andy Shevchenko <andy@kernel.org>
To: Kent Gibson <warthog618@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
brgl@bgdev.pl, linus.walleij@linaro.org
Subject: Re: [PATCH v2 4/5] gpiolib: cdev: reduce locking in gpio_desc_to_lineinfo()
Date: Thu, 14 Dec 2023 17:10:23 +0200 [thread overview]
Message-ID: <ZXsa39xneH6Rh7Gd@smile.fi.intel.com> (raw)
In-Reply-To: <20231214095814.132400-5-warthog618@gmail.com>
On Thu, Dec 14, 2023 at 05:58:13PM +0800, Kent Gibson wrote:
> Reduce the time holding the gpio_lock by snapshotting the desc flags,
> rather than testing them individually while holding the lock.
>
> Accept that the calculation of the used field is inherently racy, and
> only check the availability of the line from pinctrl if other checks
> pass, so avoiding the check for lines that are otherwise in use.
...
> - spin_lock_irqsave(&gpio_lock, flags);
Shouldn't this be covered by patch 1 (I mean conversion to scoped_guard()
instead of spinlock)?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2023-12-14 15:10 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-14 9:58 [PATCH v2 0/5] gpiolib: cdev: relocate debounce_period_us Kent Gibson
2023-12-14 9:58 ` [PATCH v2 1/5] gpiolib: cdev: adopt scoped_guard() Kent Gibson
2023-12-14 11:50 ` Kent Gibson
2023-12-14 14:53 ` Andy Shevchenko
2023-12-14 14:53 ` Andy Shevchenko
2023-12-14 9:58 ` [PATCH v2 2/5] gpiolib: cdev: relocate debounce_period_us from struct gpio_desc Kent Gibson
2023-12-14 14:29 ` Bartosz Golaszewski
2023-12-14 14:45 ` Kent Gibson
2023-12-14 14:56 ` Bartosz Golaszewski
2023-12-14 15:08 ` Kent Gibson
2023-12-14 15:03 ` Andy Shevchenko
2023-12-14 15:09 ` Andy Shevchenko
2023-12-14 16:14 ` Kent Gibson
2023-12-14 16:41 ` Andy Shevchenko
2023-12-14 21:06 ` Bartosz Golaszewski
2023-12-15 1:04 ` Kent Gibson
2023-12-15 8:07 ` Bartosz Golaszewski
2023-12-15 8:15 ` Kent Gibson
2023-12-15 16:31 ` Andy Shevchenko
2023-12-14 9:58 ` [PATCH v2 3/5] gpiolib: remove " Kent Gibson
2023-12-14 9:58 ` [PATCH v2 4/5] gpiolib: cdev: reduce locking in gpio_desc_to_lineinfo() Kent Gibson
2023-12-14 15:10 ` Andy Shevchenko [this message]
2023-12-14 15:19 ` Kent Gibson
2023-12-14 15:27 ` Andy Shevchenko
2023-12-14 15:34 ` Kent Gibson
2023-12-14 15:46 ` Kent Gibson
2023-12-14 15:52 ` Andy Shevchenko
2023-12-14 15:53 ` Kent Gibson
2023-12-14 16:02 ` Andy Shevchenko
2023-12-14 15:50 ` Andy Shevchenko
2023-12-14 16:05 ` Kent Gibson
2023-12-14 9:58 ` [PATCH v2 5/5] gpiolib: cdev: improve documentation of get/set values Kent Gibson
2023-12-14 15:12 ` Andy Shevchenko
2023-12-14 15:23 ` Kent Gibson
2023-12-14 15:27 ` Andy Shevchenko
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