This is a note to let you know that I've just added the patch titled
Subject: USB: usbserial - fix potential deadlock between write() and IRQ
to my gregkh-2.6 tree. Its filename is
usb-usbserial-fix-potential-deadlock-between-write-and-irq.patch
This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
>From [email protected] Wed Oct 24 14:28:04 2007
From: Jiri Kosina <[email protected]>
Date: Sat, 20 Oct 2007 00:05:19 +0200 (CEST)
Subject: USB: usbserial - fix potential deadlock between write() and IRQ
To: Larry Finger <[email protected]>
Cc: LKML <[email protected]>, Greg Kroah-Hartman <[email protected]>, [email protected]
Message-ID: <[email protected]>
From: Jiri Kosina <[email protected]>
USB: usbserial - fix potential deadlock between write() and IRQ
usb_serial_generic_write() doesn't disable interrupts when taking port->lock,
and could therefore deadlock with usb_serial_generic_read_bulk_callback()
being called from interrupt, taking the same lock. Fix it.
Signed-off-by: Jiri Kosina <[email protected]>
Acked-by: Larry Finger <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/serial/generic.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -208,14 +208,15 @@ int usb_serial_generic_write(struct usb_
/* only do something if we have a bulk out endpoint */
if (serial->num_bulk_out) {
- spin_lock_bh(&port->lock);
+ unsigned long flags;
+ spin_lock_irqsave(&port->lock, flags);
if (port->write_urb_busy) {
- spin_unlock_bh(&port->lock);
+ spin_unlock_irqrestore(&port->lock, flags);
dbg("%s - already writing", __FUNCTION__);
return 0;
}
port->write_urb_busy = 1;
- spin_unlock_bh(&port->lock);
+ spin_unlock_irqrestore(&port->lock, flags);
count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
Patches currently in gregkh-2.6 which might be from [email protected] are
usb/usb-usbserial-fix-potential-deadlock-between-write-and-irq.patch
-
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