[PATCH][next] drm/amd/amdgpu: Fix a less than zero check on a uint32_t struct field

[PATCH][next] drm/amd/amdgpu: Fix a less than zero check on a uint32_t struct field

[Colin Ian King]

Currently the error check from the call to mes_v12_inv_tlb_convert_hub_id
is always false because a uint32_t struct field hub_id is being used to
to perform the less than zero error check. Fix this by using the int
variable ret to perform the check.

Fixes: 87e65052616c ("drm/amd/amdgpu : Use the MES INV_TLBS API for tlb invalidation on gfx12")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/mes_v12_0.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c b/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c
index cd5c966cee95..ff5df28b57ec 100644
--- a/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c
@@ -899,6 +899,7 @@ static int mes_v12_0_inv_tlbs_pasid(struct amdgpu_mes *mes,
 				    struct mes_inv_tlbs_pasid_input *input)
 {
 	union MESAPI__INV_TLBS mes_inv_tlbs;
+	int ret;
 
 	memset(&mes_inv_tlbs, 0, sizeof(mes_inv_tlbs));
 
@@ -911,9 +912,10 @@ static int mes_v12_0_inv_tlbs_pasid(struct amdgpu_mes *mes,
 	mes_inv_tlbs.invalidate_tlbs.inv_sel_id = input->pasid;
 
 	/*convert amdgpu_mes_hub_id to mes expected hub_id */
-	mes_inv_tlbs.invalidate_tlbs.hub_id = mes_v12_inv_tlb_convert_hub_id(input->hub_id);
-	if (mes_inv_tlbs.invalidate_tlbs.hub_id < 0)
+	ret = mes_v12_inv_tlb_convert_hub_id(input->hub_id);
+	if (ret < 0)
 		return -EINVAL;
+	mes_inv_tlbs.invalidate_tlbs.hub_id = ret;
 	return mes_v12_0_submit_pkt_and_poll_completion(mes, AMDGPU_MES_KIQ_PIPE,
 			&mes_inv_tlbs, sizeof(mes_inv_tlbs),
 			offsetof(union MESAPI__INV_TLBS, api_status));
-- 
2.51.0

Re: [PATCH][next] drm/amd/amdgpu: Fix a less than zero check on a uint32_t struct field

[Dan Carpenter]

Are you editing your CC list?  The get_maintainer.pl script gives me a
longer list.  The most important thing is that you've left off Shaoyun Liu
from the Fixes tag.  Added.

The kbuild-bot did report this bug on Friday so the AMD folks likely have
a patch kicking around on their end, but just haven't sent it out
publicly yet?
https://lore.kernel.org/all/202508290749.ti6u3cLL-lkp@intel.com/

Anyway, the patch is fine.

Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>

regards,
dan carpenter

Re: [PATCH][next] drm/amd/amdgpu: Fix a less than zero check on a uint32_t struct field

[Alex Deucher]

Applied.  Thanks!

Alex

On Wed, Sep 3, 2025 at 7:24 AM Dan Carpenter <dan.carpenter@linaro.org> wrote:
>
> Are you editing your CC list?  The get_maintainer.pl script gives me a
> longer list.  The most important thing is that you've left off Shaoyun Liu
> from the Fixes tag.  Added.
>
> The kbuild-bot did report this bug on Friday so the AMD folks likely have
> a patch kicking around on their end, but just haven't sent it out
> publicly yet?
> https://lore.kernel.org/all/202508290749.ti6u3cLL-lkp@intel.com/
>
> Anyway, the patch is fine.
>
> Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
>
> regards,
> dan carpenter