From mboxrd@z Thu Jan  1 00:00:00 1970
From: neil.baylis@gmail.com (Neil Baylis)
Date: Thu, 2 Jun 2011 13:43:05 -0700
Subject: Calling printk with locks held
Message-ID: <BANLkTim4iXf79fnUswpEDdgZ5rQ7RfOFjA@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

I've just been told that it's not OK to call printk while holding a lock.
This came as a surprise to me, as I've written thousands of lines of code
that calls printk while holding multiple locks, and have not seen any
problem. The only explanation I was given was that it can deadlock.

Is this correct? I thought there were very few places where it was not safe
to call printk.

Neil Baylis
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