Commit c01d2c58 authored Oct 25, 2020 by Johan Hovold

USB: serial: keyspan_pda: fix stalled writes

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: 507ca9bc ("[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>

parent 7353cad7

drivers/usb/serial/keyspan_pda.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -548,7 +548,7 @@ static int keyspan_pda_write(struct tty_struct *tty,

		rc = count;
		exit:
		if (rc < 0)
		if (rc <= 0)
		set_bit(0, &port->write_urbs_free);
		return rc;
		}

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