linux-kernel - [PATCH][next] drm/amdkfd: fix uint32 variable compared to less than zero

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Date:   Thu, 22 Apr 2021 13:31:58 +0100
From:   Colin King <colin.king@...onical.com>
To:     Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Alex Sierra <alex.sierra@....com>,
        Philip Yang <Philip.Yang@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] drm/amdkfd: fix uint32 variable compared to less than zero

From: Colin Ian King <colin.king@...onical.com>

Currently the call to kfd_process_gpuidx_from_gpuid is returning an
int value and this is being assigned to a uint32_t variable gpuidx
and this is being checked for a negative error return which is always
going to be false. Fix this by making gpuidx an int32_t. This makes
gpuidx also type consistent with the use of gpuidx from the callers.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: cda0f85bfa5e ("drm/amdkfd: refine migration policy with xnack on")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 0e0b4ffd20ab..bf3c8de85b4a 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1330,7 +1330,7 @@ static void svm_range_unreserve_bos(struct svm_validate_context *ctx)
  */
 static int svm_range_validate_and_map(struct mm_struct *mm,
 				      struct svm_range *prange,
-				      uint32_t gpuidx, bool intr, bool wait)
+				      int32_t gpuidx, bool intr, bool wait)
 {
 	struct svm_validate_context ctx;
 	struct hmm_range *hmm_range;
-- 
2.30.2