From: Alex Ivanov <gnidorah@p0n4ik.tk>
Date: Fri, 20 Sep 2013 13:36:06 +0000 (+0400)
Subject: drm/radeon: Make r100_cp_ring_info() and radeon_ring_gfx() safe (v2)
X-Git-Tag: v3.12-rc3~7^2~1^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0eb3448aa6b31fbf24c31756aba7940cac5ad6b8;p=pandora-kernel.git

drm/radeon: Make r100_cp_ring_info() and radeon_ring_gfx() safe (v2)

Prevent NULL pointer dereference in case when radeon_ring_fini() did it's job.

Reading of r100_cp_ring_info and radeon_ring_gfx debugfs entries will lead to a KP if ring buffer was deallocated, e.g. on failed ring test.
Seen on PA-RISC machine having "radeon: ring test failed (scratch(0x8504)=0xCAFEDEAD)" issue.

v2: agd5f: add some parens around ring->ready check

Signed-off-by: Alex Ivanov <gnidorah@p0n4ik.tk>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
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