Make sure to drop the reference taken to the SCP device when attempting
to look up its driver data before the driver has been bound.
Note that holding a reference to a device does not prevent its driver
data from going away.
Fixes: 63c13d61eafe ("remoteproc/mediatek: add SCP support for mt8183")
Cc: [email protected] # 5.6
Cc: Erin Lo <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
---
drivers/remoteproc/mtk_scp.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 85a74c9ec521..436656bdfa8b 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -36,6 +36,7 @@ struct mtk_scp *scp_get(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *scp_node;
struct platform_device *scp_pdev;
+ struct mtk_scp *scp;
scp_node = of_parse_phandle(dev->of_node, "mediatek,scp", 0);
if (!scp_node) {
@@ -51,7 +52,13 @@ struct mtk_scp *scp_get(struct platform_device *pdev)
return NULL;
}
- return platform_get_drvdata(scp_pdev);
+ scp = platform_get_drvdata(scp_pdev);
+ if (!scp) {
+ put_device(&scp_pdev->dev);
+ return NULL;
+ }
+
+ return scp;
}
EXPORT_SYMBOL_GPL(scp_get);
--
2.54.0
