diff options
| author | Evgeny Novikov <novikov@ispras.ru> | 2021-07-08 10:30:56 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-21 10:04:41 +0200 |
| commit | 61136a12cbed234374ec6f588af57c580b20b772 (patch) | |
| tree | 5d752f5ef70730ba09ae8b7fc0dc214ef401418f | |
| parent | usb: gadget: u_ether: fix a potential null pointer dereference (diff) | |
| download | linux-61136a12cbed234374ec6f588af57c580b20b772.tar.xz linux-61136a12cbed234374ec6f588af57c580b20b772.zip | |
USB: EHCI: ehci-mv: improve error handling in mv_ehci_enable()
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>
| -rw-r--r-- | drivers/usb/host/ehci-mv.c | 23 |
1 files 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) |