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drm/radeon: check return value of radeon_ring_lock

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Function radeon_ring_lock() returns an errno on failure, and its return
value should be validated. However, in functions r420_cp_errata_init()
and r420_cp_errata_fini(), its return value is not checked. This patch
adds the checks.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Pan Bian 2017-04-24 16:38:05 +08:00 committed by Alex Deucher
parent 91faed9ee1
commit c346fb74fb
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/radeon/r420.c
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@ -203,6 +203,7 @@ static void r420_clock_resume(struct radeon_device *rdev)
static void r420_cp_errata_init(struct radeon_device *rdev)
{
int r;
struct radeon_ring *ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];
/* RV410 and R420 can lock up if CP DMA to host memory happens
@ -212,7 +213,8 @@ static void r420_cp_errata_init(struct radeon_device *rdev)
* of the CP init, apparently.
*/
radeon_scratch_get(rdev, &rdev->config.r300.resync_scratch);
radeon_ring_lock(rdev, ring, 8);
r = radeon_ring_lock(rdev, ring, 8);
WARN_ON(r);
radeon_ring_write(ring, PACKET0(R300_CP_RESYNC_ADDR, 1));
radeon_ring_write(ring, rdev->config.r300.resync_scratch);
radeon_ring_write(ring, 0xDEADBEEF);
@ -221,12 +223,14 @@ static void r420_cp_errata_init(struct radeon_device *rdev)
static void r420_cp_errata_fini(struct radeon_device *rdev)
{
int r;
struct radeon_ring *ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];
/* Catch the RESYNC we dispatched all the way back,
* at the very beginning of the CP init.
*/
radeon_ring_lock(rdev, ring, 8);
r = radeon_ring_lock(rdev, ring, 8);
WARN_ON(r);
radeon_ring_write(ring, PACKET0(R300_RB3D_DSTCACHE_CTLSTAT, 0));
radeon_ring_write(ring, R300_RB3D_DC_FINISH);
radeon_ring_unlock_commit(rdev, ring, false);