On 06/08/2021 12:15, Christophe JAILLET wrote:
'of_find_device_by_node()' takes a reference that must be released when not needed anymore. This is expected to be done in 'dsi_destroy()'.
However, there are 2 issues in 'dsi_get_phy()'.
First, if 'of_find_device_by_node()' succeeds but 'platform_get_drvdata()' returns NULL, 'msm_dsi->phy_dev' will still be NULL, and the reference won't be released in 'dsi_destroy()'.
Secondly, as 'of_find_device_by_node()' already takes a reference, there is no need for an additional 'get_device()'.
Move the assignment to 'msm_dsi->phy_dev' a few lines above and remove the unneeded 'get_device()' to solve both issues.
Fixes: ec31abf6684e ("drm/msm/dsi: Separate PHY to another platform device") Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr
Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org
Review carefully, management of reference counted resources is sometimes tricky.
drivers/gpu/drm/msm/dsi/dsi.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c index 75afc12a7b25..29d11f1cb79b 100644 --- a/drivers/gpu/drm/msm/dsi/dsi.c +++ b/drivers/gpu/drm/msm/dsi/dsi.c @@ -26,8 +26,10 @@ static int dsi_get_phy(struct msm_dsi *msm_dsi) }
phy_pdev = of_find_device_by_node(phy_node);
- if (phy_pdev)
if (phy_pdev) { msm_dsi->phy = platform_get_drvdata(phy_pdev);
msm_dsi->phy_dev = &phy_pdev->dev;}
of_node_put(phy_node);
@@ -36,8 +38,6 @@ static int dsi_get_phy(struct msm_dsi *msm_dsi) return -EPROBE_DEFER; }
- msm_dsi->phy_dev = get_device(&phy_pdev->dev);
- return 0; }