[Freedreno] [PATCH -next] drm/msm/adreno: adreno_gpu: Switch to memdup_user_nul() helper

[Ruan Jinjie]

Use memdup_user_nul() helper instead of open-coding to simplify the code.

Signed-off-by: Ruan Jinjie <ruanjin...@huawei.com>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c 
b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 5c5901d65950..9416c41cd13f 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -400,17 +400,9 @@ int adreno_set_param(struct msm_gpu *gpu, struct 
msm_file_private *ctx,
        case MSM_PARAM_CMDLINE: {
                char *str, **paramp;
 
-               str = kmalloc(len + 1, GFP_KERNEL);
-               if (!str)
-                       return -ENOMEM;
-
-               if (copy_from_user(str, u64_to_user_ptr(value), len)) {
-                       kfree(str);
-                       return -EFAULT;
-               }
-
-               /* Ensure string is null terminated: */
-               str[len] = '\0';
+               str = memdup_user_nul(u64_to_user_ptr(value), len);
+               if (IS_ERR(str))
+                       return PTR_ERR(str);
 
                mutex_lock(&gpu->lock);
 
-- 
2.34.1