Disconnecting a device is not just a hang up. The device is gone.
We should tell user space the truth immediately.
Signed-off-by: Oliver Neukum <oneu...@suse.com>
---
drivers/usb/serial/generic.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 54e170d..147696d 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -505,6 +505,10 @@ int usb_serial_generic_tiocmiwait(struct tty_struct *tty,
unsigned long arg)
usb_serial_generic_msr_changed(tty, arg, &cnow));
if (!ret && !test_bit(ASYNCB_INITIALIZED, &port->port.flags))
ret = -EIO;
+ mutex_lock(&port->serial->disc_mutex);
+ if (port->serial->disconnected)
+ ret = -ENODEV;
+ mutex_unlock(&port->serial->disc_mutex);
return ret;
}
--
2.1.4
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