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| author | Greg Kroah-Hartman <gregkh@suse.de> | 2005-04-23 12:49:16 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-06-27 14:43:47 -0700 |
| commit | 507ca9bc0476662f3463888d583864834eab1e11 (patch) | |
| tree | 421a373de235fcb4cb46a4723a1e9f00a71f709a /drivers/usb/serial/ipw.c | |
| parent | f4df0e334a9fc731689e8ba4f42a0d72a7491348 (diff) | |
| download | linux-507ca9bc0476662f3463888d583864834eab1e11.tar.gz linux-507ca9bc0476662f3463888d583864834eab1e11.tar.bz2 linux-507ca9bc0476662f3463888d583864834eab1e11.zip | |
[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 <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/ipw.c')
| -rw-r--r-- | drivers/usb/serial/ipw.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/usb/serial/ipw.c b/drivers/usb/serial/ipw.c index 11105d74f461..85e242459c27 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; } |