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From: Stephane Grosjean <s.grosjean-g4cQ8AsIbFbL9ATBNaCtXw@public.gmane.org>
To: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Questions about i2c_transfer() usage in timer context...
Date: Mon, 20 Feb 2012 14:01:52 +0100	[thread overview]
Message-ID: <4F424440.300@peak-system.com> (raw)

Hi,

I'm facing a deadlock regarding a timer callback which is only calling 
i2c_transfer(), and I wonder if this comes from that call: I first 
googled and found that i2c_transfer() may sleep (which is forbidden in 
my timer callback) but when I have a look the beginning of the function, 
it starts to check if it is in any atomic context, before trying to 
acquire  a lock...

So I'm afraid I'm lost and I hope someone will be able to understand to 
that question: might i2c_transfer() be used in a timer callback or 
should I handle my periodic call to i2c_tranfer() by means of a delayed 
work?

Thanks for your reply,

Regards,

Stéphane

             reply	other threads:[~2012-02-20 13:01 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-20 13:01 Stephane Grosjean [this message]
     [not found] ` <4F424440.300-g4cQ8AsIbFbL9ATBNaCtXw@public.gmane.org>
2012-02-20 13:11   ` Questions about i2c_transfer() usage in timer context Jean Delvare
     [not found]     ` <20120220141112.1e633beb-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2012-02-20 13:19       ` Stephane Grosjean
     [not found]     ` <CADkCAusvXZC5Ju2oNbBgi6aZO2E9upoDPbtFqTbrbBhd8eCu8A@mail.gmail.com>
     [not found]       ` <CADkCAusvXZC5Ju2oNbBgi6aZO2E9upoDPbtFqTbrbBhd8eCu8A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-02-20 14:13         ` Jean Delvare

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