[PATCH 1/8] drm/msm/a6xx: Check BX dependency vote index

[Akhil P Oommen]

a6xx_gmu_rpmh_arc_index() returns a signed error value. Check the result
before passing it to FIELD_MODIFY(), which rejects a compiler-propagated
negative value as too large for the field.

Fixes: 020b8eaa1db8 ("drm/msm/a6xx: Add BX rail support to GMU dependency votes")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202610070334.bYvBJSpj-lkp@xxxxxxxxx/
Signed-off-by: Akhil P Oommen <akhilpo@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 662f09bec9d5..9e02d6f939af 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -1867,6 +1867,9 @@ static int a6xx_gmu_rpmh_dep_votes_init(struct device *dev, u32 *votes,
 		 * back to the highest BX corner if none is high enough.
 		 */
 		bx = a6xx_gmu_rpmh_arc_index(dev, gbx, gbx_count, gx[index], true);
+		if (bx < 0)
+			return bx;
+
 		FIELD_MODIFY(GMU_BX_MASK, &votes[i], bx);
 	}
 

-- 
2.55.0