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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Alan Stern <stern@rowland.harvard.edu>,
        Evgeny Novikov <novikov@ispras.ru>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.14 197/432] USB: EHCI: ehci-mv: improve error handling in mv_ehci_enable()
Date:   Thu, 16 Sep 2021 17:59:06 +0200
Message-Id: <20210916155817.467117100@linuxfoundation.org>
In-Reply-To: <20210916155810.813340753@linuxfoundation.org>
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From: Evgeny Novikov <novikov@ispras.ru>

[ Upstream commit 61136a12cbed234374ec6f588af57c580b20b772 ]

mv_ehci_enable() did not disable and unprepare clocks in case of
failures of phy_init(). Besides, it did not take into account failures
of ehci_clock_enable() (in effect, failures of clk_prepare_enable()).
The patch fixes both issues and gets rid of redundant wrappers around
clk_prepare_enable() and clk_disable_unprepare() to simplify this a bit.

Found by Linux Driver Verification project (linuxtesting.org).

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Link: https://lore.kernel.org/r/20210708083056.21543-1-novikov@ispras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/host/ehci-mv.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/host/ehci-mv.c b/drivers/usb/host/ehci-mv.c
index cffdc8d01b2a..8fd27249ad25 100644
--- a/drivers/usb/host/ehci-mv.c
+++ b/drivers/usb/host/ehci-mv.c
@@ -42,26 +42,25 @@ struct ehci_hcd_mv {
 	int (*set_vbus)(unsigned int vbus);
 };
 
-static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
+static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
 {
-	clk_prepare_enable(ehci_mv->clk);
-}
+	int retval;
 
-static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
-{
-	clk_disable_unprepare(ehci_mv->clk);
-}
+	retval = clk_prepare_enable(ehci_mv->clk);
+	if (retval)
+		return retval;
 
-static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
-{
-	ehci_clock_enable(ehci_mv);
-	return phy_init(ehci_mv->phy);
+	retval = phy_init(ehci_mv->phy);
+	if (retval)
+		clk_disable_unprepare(ehci_mv->clk);
+
+	return retval;
 }
 
 static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
 {
 	phy_exit(ehci_mv->phy);
-	ehci_clock_disable(ehci_mv);
+	clk_disable_unprepare(ehci_mv->clk);
 }
 
 static int mv_ehci_reset(struct usb_hcd *hcd)
-- 
2.30.2