From: Jacek Anaszewski <jacek.anaszewski@gmail.com>
To: Pavel Machek <pavel@ucw.cz>, Jacek Anaszewski <j.anaszewski@samsung.com>
Cc: linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org,
Hans de Goede <hdegoede@redhat.com>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Andrew Lunn <andrew@lunn.ch>
Subject: Re: [PATCH] leds: Add mutex protection in brightness_show()
Date: Wed, 9 Nov 2016 22:23:51 +0100 [thread overview]
Message-ID: <b4d76bf3-c973-c12a-23a9-69c6d47d0ffb@gmail.com> (raw)
In-Reply-To: <20161109123800.GB3488@amd>
Hi,
On 11/09/2016 01:38 PM, Pavel Machek wrote:
> Hi!
>
>> Initially the claim about no need for lock in brightness_show()
>> was valid as the function was just returning unchanged
>> LED brightness. After the addition of led_update_brightness() this
>
> The claim was probably wrong from the day one, unless brightness is of
> type "atomic_t".
>
> /* Ensures consistent access to the LED Flash Class device */
> struct mutex led_access;
> };
>
> This should really list fields that are protected by led_access.
Originally it was introduced to facilitate disabling LED subsystem
sysfs interface, i.e. it protects flags property of
struct led_classdev.
--
Best regards,
Jacek Anaszewski
prev parent reply other threads:[~2016-11-09 21:24 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-04 7:52 Jacek Anaszewski
2016-11-04 11:53 ` Hans de Goede
2016-11-04 16:06 ` Jacek Anaszewski
2016-11-04 16:46 ` Hans de Goede
2016-11-06 14:52 ` Hans de Goede
2016-11-07 9:11 ` Jacek Anaszewski
2016-11-09 12:37 ` Pavel Machek
2016-11-09 20:26 ` Pavel Machek
2016-11-09 21:23 ` Jacek Anaszewski
2016-11-09 12:38 ` Pavel Machek
2016-11-09 21:23 ` Jacek Anaszewski [this message]
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