From: Borislav Petkov Date: Sun, 28 Oct 2007 12:24:16 +0000 (+0100) Subject: usbserial: fix inconsistent lock state X-Git-Tag: v2.6.24-rc4~76^2~17 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=bfaeafcfc2242277e31cc1cfae687afaac0cd9ec;p=linux-2.6-omap-h63xx.git usbserial: fix inconsistent lock state In commit acd2a847e7fee7df11817f67dba75a2802793e5d usb_serial_generic_write() disables interrupts when taking &port->lock which is also taken in usb_serial_generic_read_bulk_callback() resulting in an inconsistent lock state due to the latter not disabling interrupts on the local cpu. Fix that by disabling interrupts in the latter call site also. Signed-off-by: Borislav Petkov Acked-by: Jiri Kosina Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c index 9eb4a65ee4d..d41531139c5 100644 --- a/drivers/usb/serial/generic.c +++ b/drivers/usb/serial/generic.c @@ -327,6 +327,7 @@ void usb_serial_generic_read_bulk_callback (struct urb *urb) struct usb_serial_port *port = (struct usb_serial_port *)urb->context; unsigned char *data = urb->transfer_buffer; int status = urb->status; + unsigned long flags; dbg("%s - port %d", __FUNCTION__, port->number); @@ -339,11 +340,11 @@ void usb_serial_generic_read_bulk_callback (struct urb *urb) usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data); /* Throttle the device if requested by tty */ - spin_lock(&port->lock); + spin_lock_irqsave(&port->lock, flags); if (!(port->throttled = port->throttle_req)) /* Handle data and continue reading from device */ flush_and_resubmit_read_urb(port); - spin_unlock(&port->lock); + spin_unlock_irqrestore(&port->lock, flags); } EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);