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authorDavid Brownell <david-b@pacbell.net>2006-06-30 11:34:42 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2006-07-13 01:03:23 +0200
commitb972b68c396cfa9f8af7e0b314e22705251bc218 (patch)
tree5cd84d901fdeb4921593521197eee57ab066e2b9 /drivers
parent[PATCH] USB: add driver for non-composite Sierra Wireless devices (diff)
downloadlinux-b972b68c396cfa9f8af7e0b314e22705251bc218.tar.xz
linux-b972b68c396cfa9f8af7e0b314e22705251bc218.zip
[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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/host/ehci-hcd.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index cee6f538de0a..85b0b4ad4c16 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -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;