Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes" causes gobi_loader to hang

[Oliver Neukum]

Am Dienstag, 19. Januar 2010 14:29:34 schrieb Alan Cox:
> On Tue, 19 Jan 2010 14:20:29 +0100
> Oliver Neukum <oliver@xxxxxxxxxx> wrote:
> 
> > Am Montag, 18. Januar 2010 21:14:16 schrieb Matthew Garrett:
> > 
> > > drivers/usb/serial/generic.c: usb_serial_generic_write - port 0, 1565 
> > > bytes
> > > drivers/usb/serial/generic.c: usb_serial_generic_write - put 0 bytes 
> > > into fifo
> > > drivers/usb/serial/generic.c: usb_serial_generic_read_bulk_callback - 
> > > port 0
> > 
> > If the FIFO is full we can do nothing. Please try the attached patch.
> 
> If the FIFO is full how are we getting called - we should have throttled
> earlier if there is any flow control (including 'look no URBs' cases) ?

The log shows no call to usb_serial_generic_write_room()
Do you consider this a bug in the tty layer?

	Regards
		Oliver
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