From 507ca9bc0476662f3463888d583864834eab1e11 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Sat, 23 Apr 2005 12:49:16 -0700 Subject: [PATCH] USB: add ability for usb-serial drivers to determine if their write urb is currently being used. This removes a lot of racy and buggy code by trying to check the status of the urb. Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/ipw.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'drivers/usb/serial/ipw.c') diff --git a/drivers/usb/serial/ipw.c b/drivers/usb/serial/ipw.c index 11105d74f46..85e242459c2 100644 --- a/drivers/usb/serial/ipw.c +++ b/drivers/usb/serial/ipw.c @@ -399,16 +399,21 @@ static int ipw_write(struct usb_serial_port *port, const unsigned char *buf, int dbg("%s - write request of 0 bytes", __FUNCTION__); return 0; } - - /* Racy and broken, FIXME properly! */ - if (port->write_urb->status == -EINPROGRESS) + + spin_lock(&port->lock); + if (port->write_urb_busy) { + spin_unlock(&port->lock); + dbg("%s - already writing", __FUNCTION__); return 0; + } + port->write_urb_busy = 1; + spin_unlock(&port->lock); count = min(count, port->bulk_out_size); memcpy(port->bulk_out_buffer, buf, count); dbg("%s count now:%d", __FUNCTION__, count); - + usb_fill_bulk_urb(port->write_urb, dev, usb_sndbulkpipe(dev, port->bulk_out_endpointAddress), port->write_urb->transfer_buffer, @@ -418,6 +423,7 @@ static int ipw_write(struct usb_serial_port *port, const unsigned char *buf, int ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); if (ret != 0) { + port->write_urb_busy = 0; dbg("%s - usb_submit_urb(write bulk) failed with error = %d", __FUNCTION__, ret); return ret; } -- cgit v1.2.3