From: Jean Delvare <khali@linux-fr.org>
Date: Fri, 29 Jun 2012 10:47:19 +0000 (-0300)
Subject: [media] i2c: Export an unlocked flavor of i2c_transfer
X-Git-Tag: v3.6-rc1~40^2^2~110
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b37d2a3a75cb0e72e18c29336cb2095b63dabfc8;p=pandora-kernel.git

[media] i2c: Export an unlocked flavor of i2c_transfer

Some drivers (in particular for TV cards) need exclusive access to
their I2C buses for specific operations. Export an unlocked flavor
of i2c_transfer to give them full control.

The unlocked flavor has the following limitations:
* Obviously, caller must hold the i2c adapter lock.
* No debug messages are logged. We don't want to log messages while
  holding a rt_mutex.
* No check is done on the existence of adap->algo->master_xfer. It
  is thus the caller's responsibility to ensure that the function is
  OK to call.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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