libata: make ->scr_read/write callbacks return error code
authorTejun Heo <htejun@gmail.com>
Mon, 16 Jul 2007 05:29:40 +0000 (14:29 +0900)
committerJeff Garzik <jeff@garzik.org>
Fri, 20 Jul 2007 12:02:11 +0000 (08:02 -0400)
Convert ->scr_read/write callbacks to return error code to better
indicate failure.  This will help handling of SCR_NOTIFICATION.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

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