[PATCH] drm/i915/gt: Use the correct error value when kernel_context() fails

[Andi Shyti]

kernel_context() returns an error pointer. Use pointer-error
conversion functions to evaluate its return value, rather than
checking for a '0' return.

Fixes: eb5c10cbbc2f ("drm/i915: Remove I915_USER_PRIORITY_SHIFT")
Reported-by: Dan Carpenter <dan.carpen...@linaro.org>
Signed-off-by: Andi Shyti <andi.sh...@linux.intel.com>
Cc: Chris Wilson < ch...@chris-wilson.co.uk>
Cc: <sta...@vger.kernel.org> # v5.13+
---
 drivers/gpu/drm/i915/gt/selftest_execlists.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c 
b/drivers/gpu/drm/i915/gt/selftest_execlists.c
index 736b89a8ecf54..4202df5b8c122 100644
--- a/drivers/gpu/drm/i915/gt/selftest_execlists.c
+++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c
@@ -1530,8 +1530,8 @@ static int live_busywait_preempt(void *arg)
        struct drm_i915_gem_object *obj;
        struct i915_vma *vma;
        enum intel_engine_id id;
-       int err = -ENOMEM;
        u32 *map;
+       int err;
 
        /*
         * Verify that even without HAS_LOGICAL_RING_PREEMPTION, we can
@@ -1539,13 +1539,17 @@ static int live_busywait_preempt(void *arg)
         */
 
        ctx_hi = kernel_context(gt->i915, NULL);
-       if (!ctx_hi)
-               return -ENOMEM;
+       if (IS_ERR(ctx_hi))
+               return PTR_ERR(ctx_hi);
+
        ctx_hi->sched.priority = I915_CONTEXT_MAX_USER_PRIORITY;
 
        ctx_lo = kernel_context(gt->i915, NULL);
-       if (!ctx_lo)
+       if (IS_ERR(ctx_lo)) {
+               err = PTR_ERR(ctx_lo);
                goto err_ctx_hi;
+       }
+
        ctx_lo->sched.priority = I915_CONTEXT_MIN_USER_PRIORITY;
 
        obj = i915_gem_object_create_internal(gt->i915, PAGE_SIZE);
-- 
2.40.1