On Mon, Sep 21, 2015 at 10:48:52AM +0800, Lu, Baolu wrote:
>
>
> On 09/16/2015 10:08 PM, Sudip Mukherjee wrote:
> >On error find_tt() returns either a NULL pointer or the error value in
> >ERR_PTR. But we were dereferencing it directly without even checking if
> >find_tt() returned a valid pointer or not.
> >
> >Signed-off-by: Sudip Mukherjee <sudip@xxxxxxxxxxxxxxx>
> >---
> > drivers/usb/host/ehci-sched.c | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> >diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
> >index f9a3327..27bced7 100644
> >--- a/drivers/usb/host/ehci-sched.c
> >+++ b/drivers/usb/host/ehci-sched.c
> >@@ -257,6 +257,8 @@ static void reserve_release_intr_bandwidth(struct ehci_hcd *ehci,
> > /* FS/LS bus bandwidth */
> > if (tt_usecs) {
> > tt = find_tt(qh->ps.udev);
> >+ if (!tt || IS_ERR(tt))
>
> Why not IS_ERR_OR_NULL()?
This was v1, corrected in v2. And Alan has already explained why this
patch is not required.
regards
sudip
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