ARM: 9207/1: amba: fix refcount underflow if amba_device_add() fails

"ARM: 9192/1: amba: fix memory leak in amba_device_try_add()" leads
to a refcount underflow if amba_device_add() fails, which called by
of_amba_device_create(), the of_amba_device_create() already exists
the error handling, so amba_put_device() only need to be added into
amba_deferred_retry().

Fixes: 7719a68b2fa4 ("ARM: 9192/1: amba: fix memory leak in amba_device_try_add()")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 0e3ed5e..0cb2032 100644 (file)
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -493,13 +493,8 @@ static int amba_device_try_add(struct amba_device *dev, struct resource *parent)
                goto skip_probe;
 
        ret = amba_read_periphid(dev);
-       if (ret) {
-               if (ret != -EPROBE_DEFER) {
-                       amba_device_put(dev);
-                       goto err_out;
-               }
+       if (ret)
                goto err_release;
-       }
 
 skip_probe:
        ret = device_add(&dev->dev);
@@ -546,6 +541,7 @@ static int amba_deferred_retry(void)
                        continue;
 
                list_del_init(&ddev->node);
+               amba_device_put(ddev->dev);
                kfree(ddev);
        }