Re: [PATCH 0/7] USB: serial: add wait_until_sent-support

[Johan Hovold]

On Fri, May 17, 2013 at 10:46:37AM -0500, Caylan Larson wrote:
> Johan,
> 
> I have tested these patches and the performance is much better.  Thank you.

Thanks for testing. The patches are already in the usb tree (usb-linus
branch) and should show up in v3.10-rc soon.

Johan

> Tested-by: Caylan Larson <i@xxxxxxxxxx>
> 
> Caylan
> 
> 
> On May 5, 2013, at 1:32 PM, Johan Hovold <jhovold@xxxxxxxxx> wrote:
> 
> > These patches add wait_until_sent-support to usb-serial, which removes
> > the need to check hardware buffers in chars_in_buffer.
> > 
> > This fixes a problem in ftdi_sio (since 3.7) where select or TIOCMOUTQ
> > would take much longer than before due the hardware buffers being
> > queried.
> > 
> > Hardware buffers are also currently checked in chars_in_buffer in io_ti
> > (since 3.8) and ti_usb_3410_5052 (in 3.10).
> > 
> > Note that simply removing the hardware-buffer checks (e.g. for the
> > stable trees) would break tty_wait_until_sent, which is used, for
> > instance, by tcdrain, tcsendbreak, and close.
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