xen/blkback: use drv_get/set_drvdata rather than directly accessing driver_data.
authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Fri, 12 Feb 2010 00:07:31 +0000 (16:07 -0800)
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Thu, 14 Apr 2011 22:26:09 +0000 (18:26 -0400)
Direct driver_data access is obsolete and will disappear.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

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