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drm/radeon: check return value of radeon_ring_lock()

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[ Upstream commit 71225e1c930942cb1e042fc08c5cc0c4ef30e95e ]

In the unlikely event of radeon_ring_lock() failing, its errno return
value should be processed. This patch checks said return value and
prints a debug message in case of an error.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: 48c0c902e2 ("drm/radeon/kms: add support for CP setup on SI")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nikita Zhandarovich 2023-08-08 11:04:16 -07:00 committed by Greg Kroah-Hartman
parent bf48d89123
commit 94aa82723a
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/radeon/si.c
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@ -3616,6 +3616,10 @@ static int si_cp_start(struct radeon_device *rdev)
for (i = RADEON_RING_TYPE_GFX_INDEX; i <= CAYMAN_RING_TYPE_CP2_INDEX; ++i) { for (i = RADEON_RING_TYPE_GFX_INDEX; i <= CAYMAN_RING_TYPE_CP2_INDEX; ++i) {
ring = &rdev->ring[i]; ring = &rdev->ring[i];
r = radeon_ring_lock(rdev, ring, 2); r = radeon_ring_lock(rdev, ring, 2);
if (r) {
DRM_ERROR("radeon: cp failed to lock ring (%d).\n", r);
return r;
}
/* clear the compute context state */ /* clear the compute context state */
radeon_ring_write(ring, PACKET3_COMPUTE(PACKET3_CLEAR_STATE, 0)); radeon_ring_write(ring, PACKET3_COMPUTE(PACKET3_CLEAR_STATE, 0));