From: Jonathan Corbet <corbet@lwn.net>
Date: Sun, 18 May 2008 20:27:41 +0000 (-0600)
Subject: Add cycle_kernel_lock()
X-Git-Tag: v2.6.27-rc1~1103^2~88
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b2806768899dba5967bcd4a3b93eaed9a1dc4f3;p=pandora-kernel.git

Add cycle_kernel_lock()

A number of driver functions are so obviously trivial that they do not need
the big kernel lock - at least not overtly.  It turns out that the
acquisition of the BKL in driver open() functions can perform a sort of
poor-hacker's serialization function, delaying the open operation until the
driver is certain to have completed its initialization.  Add a simple
cycle_kernel_lock() function for these cases to make it clear that there is
no need to *hold* the BKL, just to be sure that we can acquire it.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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