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| author | David Brownell <david-b@pacbell.net> | 2006-06-30 02:34:42 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-07-12 16:03:23 -0700 |
| commit | b972b68c396cfa9f8af7e0b314e22705251bc218 (patch) | |
| tree | 5cd84d901fdeb4921593521197eee57ab066e2b9 /drivers | |
| parent | 69de51fdda3fd984541978313b66e4f2c44cc23e (diff) | |
| download | linux-3.10-b972b68c396cfa9f8af7e0b314e22705251bc218.tar.gz linux-3.10-b972b68c396cfa9f8af7e0b314e22705251bc218.tar.bz2 linux-3.10-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.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index cee6f538de0..85b0b4ad4c1 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; |