From: Christophe JAILLET christophe.jaillet@wanadoo.fr
stable inclusion from linux-4.19.207 commit a94fdd4b5661cc2f4c5e20f825049a594262ac18
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[ Upstream commit 6977cc89c87506ff17e6c05f0e37f46752256e82 ]
'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 Link: https://lore.kernel.org/r/f15bc57648a00e7c99f943903468a04639d50596.162824109... Signed-off-by: Rob Clark robdclark@chromium.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- 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 ff8164cc6738d..822cef472a7e9 100644 --- a/drivers/gpu/drm/msm/dsi/dsi.c +++ b/drivers/gpu/drm/msm/dsi/dsi.c @@ -34,8 +34,10 @@ 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);
@@ -44,8 +46,6 @@ static int dsi_get_phy(struct msm_dsi *msm_dsi) return -EPROBE_DEFER; }
- msm_dsi->phy_dev = get_device(&phy_pdev->dev); - return 0; }