[PATCH] EDAC/versalnet: fix remoteproc reference leak

[Guangshuo Li]

mc_probe() acquires a reference to the remote processor with
rproc_get_by_phandle(), but mc_remove() does not release the reference.

rproc_shutdown() only balances the power reference acquired by
rproc_boot(); it does not drop the device reference acquired by
rproc_get_by_phandle(). As a result, successful driver removal leaves
the remoteproc reference unbalanced.

Call rproc_put() during removal to release the reference acquired in
mc_probe().

This issue was found by manual code inspection.

Fixes: d5fe2fec6c40d ("EDAC: Add a driver for the AMD Versal NET DDR controller")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/edac/versalnet_edac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/edac/versalnet_edac.c b/drivers/edac/versalnet_edac.c
index 97ec05d68bbb..3a06b41c1d84 100644
--- a/drivers/edac/versalnet_edac.c
+++ b/drivers/edac/versalnet_edac.c
@@ -953,6 +953,7 @@ static void mc_remove(struct platform_device *pdev)
 	remove_versalnet(priv);
 	rproc_shutdown(priv->mcdi->r5_rproc);
 	cdx_mcdi_finish(priv->mcdi);
+	rproc_put(priv->mcdi->r5_rproc);
 	kfree(priv->mcdi);
 }
 
-- 
2.43.0