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drm/i915: Round l3 parity reads down

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We always read a register for l3 parity reads, and we don't really want
to ever let userspace trick us into giving back less than the dword.

Writes are okay because we assume everything will be 0 filled, and as
such, if a user really wants to write less than a dword, let them.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2013-09-12 22:28:28 -07:00 committed by Daniel Vetter
parent 472f8acc4d
commit 1c3dcd1cf6
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_sysfs.c
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@ -121,6 +121,8 @@ i915_l3_read(struct file *filp, struct kobject *kobj,
uint32_t misccpctl;
int i, ret;
count = round_down(count, 4);
ret = l3_access_valid(drm_dev, offset);
if (ret)
return ret;