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| author | Oliver Neukum <oliver@neukum.org> | 2008-01-16 17:18:52 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-02-01 14:35:03 -0800 |
| commit | a1cd7e99b343543af2be4c8c5755e26f6bfd725a (patch) | |
| tree | 41f8de097dd0889a9c6d02fa0a22b16d5146de46 /drivers/usb/serial/mos7720.c | |
| parent | 828d55c58cba6b652fd30e00c3d940cb7c523e3c (diff) | |
| download | kernel_samsung_smdk4412-a1cd7e99b343543af2be4c8c5755e26f6bfd725a.zip kernel_samsung_smdk4412-a1cd7e99b343543af2be4c8c5755e26f6bfd725a.tar.gz kernel_samsung_smdk4412-a1cd7e99b343543af2be4c8c5755e26f6bfd725a.tar.bz2 | |
USB: stop io performed by mos7720 upon close()
This fixes a problem where the mos7720 driver will make io to a device from
which it has been logically disconnected. It does so by introducing a flag by
which the generic usb serial code can signal the subdrivers their
disconnection and appropriate locking.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/mos7720.c')
| -rw-r--r-- | drivers/usb/serial/mos7720.c | 33 |
1 files changed, 18 insertions, 15 deletions
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c index 725991f..40f3a01 100644 --- a/drivers/usb/serial/mos7720.c +++ b/drivers/usb/serial/mos7720.c @@ -564,22 +564,25 @@ static void mos7720_close(struct usb_serial_port *port, struct file *filp) } /* While closing port, shutdown all bulk read, write * - * and interrupt read if they exists */ - if (serial->dev) { - dbg("Shutdown bulk write"); - usb_kill_urb(port->write_urb); - dbg("Shutdown bulk read"); - usb_kill_urb(port->read_urb); + * and interrupt read if they exists, otherwise nop */ + dbg("Shutdown bulk write"); + usb_kill_urb(port->write_urb); + dbg("Shutdown bulk read"); + usb_kill_urb(port->read_urb); + + mutex_lock(&serial->disc_mutex); + /* these commands must not be issued if the device has + * been disconnected */ + if (!serial->disconnected) { + data = 0x00; + send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor, + 0x04, &data); + + data = 0x00; + send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor, + 0x01, &data); } - - data = 0x00; - send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor, - 0x04, &data); - - data = 0x00; - send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor, - 0x01, &data); - + mutex_unlock(&serial->disc_mutex); mos7720_port->open = 0; dbg("Leaving %s", __FUNCTION__); |