If the clocks priv->iclk and priv->fclk were not enabled in ehci_hcd_sh_probe,
they should not be disabled in any path.
Conversely, if they was enabled in ehci_hcd_sh_probe, they must be disabled
in all error paths to ensure proper cleanup.
Found by Linux Verification Center (linuxtesting.org) with Klever.
Fixes: 63c845522263 ("usb: ehci-hcd: Add support for SuperH EHCI.")
Cc: stable@xxxxxxxxxxxxxxx # ff30bd6a6618: sh: clk: Fix clk_enable() to return 0 on NULL clk
Signed-off-by: Vitalii Mordan <mordan@xxxxxxxxx>
---
drivers/usb/host/ehci-sh.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/host/ehci-sh.c b/drivers/usb/host/ehci-sh.c
index d31d9506e41a..77460aac6dbd 100644
--- a/drivers/usb/host/ehci-sh.c
+++ b/drivers/usb/host/ehci-sh.c
@@ -119,8 +119,12 @@ static int ehci_hcd_sh_probe(struct platform_device *pdev)
if (IS_ERR(priv->iclk))
priv->iclk = NULL;
- clk_enable(priv->fclk);
- clk_enable(priv->iclk);
+ ret = clk_enable(priv->fclk);
+ if (ret)
+ goto fail_request_resource;
+ ret = clk_enable(priv->iclk);
+ if (ret)
+ goto fail_iclk;
ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (ret != 0) {
@@ -136,6 +140,7 @@ static int ehci_hcd_sh_probe(struct platform_device *pdev)
fail_add_hcd:
clk_disable(priv->iclk);
+fail_iclk:
clk_disable(priv->fclk);
fail_request_resource:
--
2.25.1
