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Commit 97d303b7 authored by David Daney's avatar David Daney Committed by Greg Kroah-Hartman
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serial: 8250: Don't delay after transmitter is ready. 



The loop in wait_for_xmitr() is delaying one extra uS after the ready
condition has been met.  Rewrite the loop to only delay if the
transmitter is not ready.

Signed-off-by: default avatarDavid Daney <ddaney@caviumnetworks.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent fd8b6cb4

drivers/serial/8250.c

+4 −2
Original line number Diff line number Diff line
@@ -1867,15 +1867,17 @@ static void wait_for_xmitr(struct uart_8250_port *up, int bits) 
	unsigned int status, tmout = 10000;



	/* Wait up to 10ms for the character(s) to be sent. */

	do {

	for (;;) {

		status = serial_in(up, UART_LSR);



		up->lsr_saved_flags |= status & LSR_SAVE_FLAGS;



		if ((status & bits) == bits)

			break;

		if (--tmout == 0)

			break;

		udelay(1);

	} while ((status & bits) != bits);

	}



	/* Wait up to 1s for flow control if necessary */

	if (up->port.flags & UPF_CONS_FLOW) {