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| author | Johan Hovold <jhovold@gmail.com> | 2011-11-06 22:06:22 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-15 22:33:10 +0400 |
| commit | 120f9dbc968c67f9448a4be535dfff6edc3ce711 (patch) | |
| tree | 10bc1bb080f9d56893ddc488a48c839bfa8a8ea8 /drivers/usb/serial/omninet.c | |
| parent | 694c6301e515bad574af74b6552134c4d9dcb334 (diff) | |
| download | linux-120f9dbc968c67f9448a4be535dfff6edc3ce711.tar.xz | |
USB: omninet: clean up write-urb busy handling
Use port write_urbs_free mask rather than write_urb_busy field in struct
serial_port.
Compile-only tested.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/omninet.c')
| -rw-r--r-- | drivers/usb/serial/omninet.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/drivers/usb/serial/omninet.c b/drivers/usb/serial/omninet.c index 6e976649fcae..1594bde8f9b3 100644 --- a/drivers/usb/serial/omninet.c +++ b/drivers/usb/serial/omninet.c @@ -19,7 +19,6 @@ #include <linux/tty_driver.h> #include <linux/tty_flip.h> #include <linux/module.h> -#include <linux/spinlock.h> #include <linux/uaccess.h> #include <linux/usb.h> #include <linux/usb/serial.h> @@ -242,14 +241,10 @@ static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port, return 0; } - spin_lock_bh(&wport->lock); - if (wport->write_urb_busy) { - spin_unlock_bh(&wport->lock); + if (!test_and_clear_bit(0, &port->write_urbs_free)) { dbg("%s - already writing", __func__); return 0; } - wport->write_urb_busy = 1; - spin_unlock_bh(&wport->lock); count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count; @@ -270,7 +265,7 @@ static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port, wport->write_urb->dev = serial->dev; result = usb_submit_urb(wport->write_urb, GFP_ATOMIC); if (result) { - wport->write_urb_busy = 0; + set_bit(0, &wport->write_urbs_free); dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __func__, result); @@ -289,8 +284,7 @@ static int omninet_write_room(struct tty_struct *tty) int room = 0; /* Default: no room */ - /* FIXME: no consistent locking for write_urb_busy */ - if (!wport->write_urb_busy) + if (test_bit(0, &wport->write_urbs_free)) room = wport->bulk_out_size - OMNINET_HEADERLEN; dbg("%s - returns %d", __func__, room); @@ -307,7 +301,7 @@ static void omninet_write_bulk_callback(struct urb *urb) dbg("%s - port %0x", __func__, port->number); - port->write_urb_busy = 0; + set_bit(0, &port->write_urbs_free); if (status) { dbg("%s - nonzero write bulk status received: %d", __func__, status); |