| From 755a13bc2436e3b67931585c49d2bae0ce299d21 Mon Sep 17 00:00:00 2001 |
| From: Ben Widawsky <benjamin.widawsky@intel.com> |
| Date: Thu, 12 Sep 2013 22:28:28 -0700 |
| Subject: drm/i915: Round l3 parity reads down |
| MIME-Version: 1.0 |
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| Content-Transfer-Encoding: 8bit |
| |
| 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> |
| (cherry picked from commit 1c3dcd1cf66d078bc273275c754000ba0d397ac0) |
| Signed-off-by: Darren Hart <dvhart@linux.intel.com> |
| --- |
| drivers/gpu/drm/i915/i915_sysfs.c | 2 ++ |
| 1 file changed, 2 insertions(+) |
| |
| diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c |
| index c8c4112de110..9070f503d332 100644 |
| --- a/drivers/gpu/drm/i915/i915_sysfs.c |
| +++ b/drivers/gpu/drm/i915/i915_sysfs.c |
| @@ -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; |
| -- |
| 1.8.5.rc3 |
| |
