From: Ian Abbott <[EMAIL PROTECTED]>
The anti user-DoS mechanism in the USB serial 'visor' driver can fail in
the following way:
visor_open: priv->outstanding_urbs = 0
visor_write: ++priv->outstanding_urbs
visor_close:
visor_open: priv->outstanding_urbs = 0
visor_write_bulk_callback: --priv->outstanding_urbs
So priv->outstanding_urbs ends up as (unsigned long)(-1). Not good!
I haven't seen this happen with the visor driver as I don't have the
hardware, but I have seen it while testing a patch to implement the same
functionality in the ftdi_sio driver (patch not yet submitted).
The fix is pretty simple: don't reinitialize outstanding_urbs in
visor_open. (Again, I haven't tested the fix in visor, but I have
tested it in ftdi_sio.)
Signed-off-by: Ian Abbott <[EMAIL PROTECTED]>
diff -ur a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
--- a/drivers/usb/serial/visor.c 2006-06-26 10:54:02.000000000 +0100
+++ b/drivers/usb/serial/visor.c 2006-06-26 11:19:10.000000000 +0100
@@ -303,7 +303,6 @@
spin_lock_irqsave(&priv->lock, flags);
priv->bytes_in = 0;
priv->bytes_out = 0;
- priv->outstanding_urbs = 0;
priv->throttled = 0;
spin_unlock_irqrestore(&priv->lock, flags);
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