Re: [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug]

From: Oliver Neukum
Date: Sat May 05 2007 - 12:47:27 EST


Am Samstag, 5. Mai 2007 18:08 schrieb Paul Fulghum:

> If the line discipline throttles the driver input,
> the cdc-acm driver stops giving data to the tty buffering
> and instead stores them internally.

So do usb serial drivers.

> In the serial driver this usually just results in dropping
> RTS to signal the remote end to stop sending. The serial

This may take considerable time in the case of usb devices.

> driver always immediately gives receive data to the tty buffering
> without regard to the throttled state.
>
> I would argue that cdc-acm should do the same as the serial driver.

Has this been tested?
If so we could reduce the complexity of the throtteling logic in the usb
drivers.

Regards
Oliver
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/