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USB: serial: keyspan_pda: fix stalled writes

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Make sure to clear the write-busy flag also in case no new data was
submitted due to lack of device buffer space so that writing is
resumed once space again becomes available.

Fixes: 507ca9bc04 ("[PATCH] USB: add ability for usb-serial drivers to determine if their write urb is currently being used.")
Cc: stable <stable@vger.kernel.org>     # 2.6.13
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2020-10-25 18:45:49 +01:00
parent 7353cad7ee
commit c01d2c5869
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/serial/keyspan_pda.c
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@ -548,7 +548,7 @@ static int keyspan_pda_write(struct tty_struct *tty,
rc = count; rc = count;
exit: exit:
if (rc < 0) if (rc <= 0)
set_bit(0, &port->write_urbs_free); set_bit(0, &port->write_urbs_free);
return rc; return rc;
} }