[PATCH] drm/amd/ras: use proper error checking for kthread_run return

[Miaoqian Lin]

kthread_run() returns an error pointer on failure, not NULL.
Replace NULL check with IS_ERR and use PTR_ERR to
propagate the real error from kthread_run.

Fixes: ea61341b9014 ("drm/amd/ras: Add thread to handle ras events")
Cc: sta...@vger.kernel.org
Signed-off-by: Miaoqian Lin <linmq...@gmail.com>
---
 drivers/gpu/drm/amd/ras/rascore/ras_process.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/ras/rascore/ras_process.c 
b/drivers/gpu/drm/amd/ras/rascore/ras_process.c
index 3267dcdb169c..c001074c8c56 100644
--- a/drivers/gpu/drm/amd/ras/rascore/ras_process.c
+++ b/drivers/gpu/drm/amd/ras/rascore/ras_process.c
@@ -248,9 +248,10 @@ int ras_process_init(struct ras_core_context *ras_core)
 
        ras_proc->ras_process_thread = kthread_run(ras_process_thread,
                                                        (void *)ras_core, 
"ras_process_thread");
-       if (!ras_proc->ras_process_thread) {
+       if (IS_ERR(ras_proc->ras_process_thread)) {
                RAS_DEV_ERR(ras_core->dev, "Failed to create 
ras_process_thread.\n");
-               ret =  -ENOMEM;
+               ret = PTR_ERR(ras_proc->ras_process_thread);
+               ras_proc->ras_process_thread = NULL;
                goto err;
        }
 
-- 
2.39.5 (Apple Git-154)