From: Sean Paul <seanpaul@xxxxxxxxxxxx>
clk_get_parent returns an error pointer upon failure, not NULL. So the
checks as they exist won't catch a failure. This patch changes the
checks and the return values to properly handle an error pointer.
Fixes: c4d8cfe516dc ("drm/msm/dsi: add implementation for helper functions")
Cc: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
Cc: Rob Clark <robdclark@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.19+
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
---
drivers/gpu/drm/msm/dsi/dsi_host.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index aa35d18ab43c9..02acb4338721a 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -421,15 +421,15 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host)
}
msm_host->byte_clk_src = clk_get_parent(msm_host->byte_clk);
- if (!msm_host->byte_clk_src) {
- ret = -ENODEV;
+ if (IS_ERR(msm_host->byte_clk_src)) {
+ ret = PTR_ERR(msm_host->byte_clk_src);
pr_err("%s: can't find byte_clk clock. ret=%d\n", __func__, ret);
goto exit;
}
msm_host->pixel_clk_src = clk_get_parent(msm_host->pixel_clk);
- if (!msm_host->pixel_clk_src) {
- ret = -ENODEV;
+ if (IS_ERR(msm_host->pixel_clk_src)) {
+ ret = PTR_ERR(msm_host->pixel_clk_src);
pr_err("%s: can't find pixel_clk clock. ret=%d\n", __func__, ret);
goto exit;
}
--
Sean Paul, Software Engineer, Google / Chromium OS
