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[PATCH] USB: ehci: fix bogus alteration of a local variable 

In a rare and all-but-unused path, the EHCI driver could reuse a variable
in a way that'd make trouble.  Specifically, if the first root hub port
gets an overcurrent event (rare) during a remote wakeup scenario (all but
unused in today's Linux, except for folk working with suspend-to-RAM and
similar sleep states), that would look like a fatal error which would shut
down the controller.  Fix by not reusing that variable.

Spotted by Per Hallsmark <saxofon@musiker.nu>
Fixes http://bugzilla.kernel.org/show_bug.cgi?id=6661

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell 2006-06-30 02:34:42 -07:00 committed by Greg Kroah-Hartman
parent 69de51fdda
commit b972b68c39
1 changed files with 4 additions and 3 deletions
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7
drivers/usb/host/ehci-hcd.c
View File

@ -625,10 +625,11 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd, struct pt_regs *regs)
writel (status | CMD_RUN, &ehci->regs->command);
while (i--) {
status = readl (&ehci->regs->port_status [i]);
if (status & PORT_OWNER)
int pstatus = readl (&ehci->regs->port_status [i]);
if (pstatus & PORT_OWNER)
continue;
if (!(status & PORT_RESUME)
if (!(pstatus & PORT_RESUME)
|| ehci->reset_done [i] != 0)
continue;