Re: [PATCH 0/4] USB: serial: closing-wait fixes and cleanups

[Greg KH]

On Mon, Apr 12, 2021 at 11:38:11AM +0200, Johan Hovold wrote:
> The port drain_delay parameter is used to add a time-based delay when
> closing the port in order to allow the transmit FIFO to drain in cases
> where we don't know how to tell if the FIFO is empty.
> 
> This series removes a redundant time-based delay which is no longer
> needed, and documents the reason for two other uses where such a delay
> is needed to let the transmitter shift register clear. As it turns out,
> this is really only needed for one of the two device types handled by
> the ti_usb_3410_5052 driver.

Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>