5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <johan@kernel.org>
commit 22f9efb3ae07f966a1901d929d16df1388cce65c upstream.
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: <redacted> # 5.6
Cc: Erin Lo <redacted>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20260706065614.389412-1-johan@kernel.org (local)
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/remoteproc/mtk_scp.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -36,6 +36,7 @@ struct mtk_scp *scp_get(struct platform_
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_
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);