From: "H. Peter Anvin" <hpa@zytor.com>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Vivien Didelot <vivien.didelot@savoirfairelinux.com>,
x86@kernel.org,
Jonas Fonseca <jonas.fonseca@savoirfairelinux.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [v2 3/4] platform: (TS-5500) add LED support
Date: Mon, 29 Aug 2011 22:37:53 -0700 [thread overview]
Message-ID: <4E5C7731.3080309@zytor.com> (raw)
In-Reply-To: <20110829221654.GD26846@sirena.org.uk>
On 08/29/2011 03:16 PM, Mark Brown wrote:
> On Fri, Aug 26, 2011 at 07:40:26PM -0400, Vivien Didelot wrote:
>
>> +static void ts5500_led_work(struct work_struct *work)
>> +{
>> + struct ts5500_led *led = container_of(work, struct ts5500_led, work);
>> + u8 val = led->new_brightness ? led->bit : 0;
>> +
>> + outb(val, led->ioaddr);
>> +}
>
> Can you not do outb() from atomic context? The reason lots of LED
> drivers update the hardware in a workqueue is that they communicate with
> the hardware over buses that can't be used in atomic context like I2C or
> SPI but if that's not an issue then the workqueue is not required and
> the code can be simplified.
outb() can definitely be executed from atomic context.
-hpa
next prev parent reply other threads:[~2011-08-30 5:38 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-26 23:40 [v2 0/4] Support for the TS-5500 platform Vivien Didelot
2011-08-26 23:40 ` [v2 1/4] platform: (TS-5500) add base support Vivien Didelot
2011-08-26 23:40 ` [v2 2/4] platform: (TS-5500) add GPIO support Vivien Didelot
2011-08-29 22:11 ` Mark Brown
2011-08-30 5:36 ` H. Peter Anvin
2011-08-30 11:00 ` Mark Brown
2011-08-30 14:49 ` Vivien Didelot
2011-08-30 15:12 ` Mark Brown
2011-10-12 16:41 ` Linus Walleij
2011-10-13 3:31 ` Grant Likely
2011-08-30 18:39 ` Vivien Didelot
2011-08-30 18:41 ` Mark Brown
2011-08-30 18:43 ` H. Peter Anvin
2011-08-30 21:12 ` Vivien Didelot
2011-10-12 15:35 ` Ingo Molnar
2011-10-14 6:14 ` Ingo Molnar
2011-10-15 14:29 ` Vivien Didelot
2011-08-26 23:40 ` [v2 3/4] platform: (TS-5500) add LED support Vivien Didelot
2011-08-29 22:16 ` Mark Brown
2011-08-30 5:37 ` H. Peter Anvin [this message]
2011-08-30 21:14 ` Vivien Didelot
2011-08-30 21:15 ` Mark Brown
2011-08-30 21:17 ` H. Peter Anvin
2011-08-30 21:56 ` Vivien Didelot
2011-08-30 22:04 ` H. Peter Anvin
2011-08-31 20:01 ` Vivien Didelot
2011-10-12 15:34 ` Ingo Molnar
2011-10-15 14:42 ` Vivien Didelot
2011-10-15 14:56 ` Ingo Molnar
2011-11-16 5:41 ` Ingo Molnar
2011-11-16 12:50 ` Mark Brown
2011-10-26 15:41 ` Ingo Molnar
2011-11-17 15:27 ` Vivien Didelot
2011-08-26 23:40 ` [v2 4/4] platform: (TS-5500) add ADC support Vivien Didelot
2011-08-29 22:13 ` Mark Brown
2011-09-12 7:28 ` [v2 0/4] Support for the TS-5500 platform Pavel Machek
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4E5C7731.3080309@zytor.com \
--to=hpa@zytor.com \
--cc=broonie@opensource.wolfsonmicro.com \
--cc=jonas.fonseca@savoirfairelinux.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
--cc=vivien.didelot@savoirfairelinux.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox