drm/msm/dp: fix error check return value of irq_of_parse_and_map()

The irq_of_parse_and_map() function returns 0 on failure, and does not
return an negative value.

Fixes: 8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets")
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/483176/
Link: https://lore.kernel.org/r/20220424032418.3173632-1-lv.ruyi@zte.com.cn
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 0a8b845..2119d70 100644 (file)
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1278,10 +1278,9 @@ int dp_display_request_irq(struct msm_dp *dp_display)
        dp = container_of(dp_display, struct dp_display_private, dp_display);
 
        dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
-       if (dp->irq < 0) {
-               rc = dp->irq;
-               DRM_ERROR("failed to get irq: %d\n", rc);
-               return rc;
+       if (!dp->irq) {
+               DRM_ERROR("failed to get irq\n");
+               return -EINVAL;
        }
 
        rc = devm_request_irq(&dp->pdev->dev, dp->irq,