Commit 864eeed0 authored by Sascha Hauer's avatar Sascha Hauer Committed by Russell King
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[ARM] 4994/1: <IMX UART>: Move error handling into execution path 



Move the error handling code for erroneous receive characters into
execution path. This makes the code more readable and the compiler
should know how to optimize this, right?

Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 8c9915bf

drivers/serial/imx.c

+33 −41
Original line number Diff line number Diff line
@@ -354,10 +354,9 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) 
	struct tty_struct *tty = sport->port.info->tty;

	unsigned long flags, temp;



	rx = readl(sport->port.membase + URXD0);

	spin_lock_irqsave(&sport->port.lock,flags);



	do {

	while ((rx = readl(sport->port.membase + URXD0)) & URXD_CHARRDY) {

		flg = TTY_NORMAL;

		sport->port.icount.rx++;
@@ -365,29 +364,14 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) 
		if (temp & USR2_BRCD) {

			writel(temp | USR2_BRCD, sport->port.membase + USR2);

			if (uart_handle_break(&sport->port))

				goto ignore_char;

				continue;

		}



		if (uart_handle_sysrq_char

		            (&sport->port, (unsigned char)rx))

			goto ignore_char;

			continue;



		if( rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) )

			goto handle_error;



	error_return:

		tty_insert_flip_char(tty, rx, flg);



	ignore_char:

		rx = readl(sport->port.membase + URXD0);

	} while(rx & URXD_CHARRDY);



out:

	spin_unlock_irqrestore(&sport->port.lock,flags);

	tty_flip_buffer_push(tty);

	return IRQ_HANDLED;



handle_error:

		if (rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) ) {

			if (rx & URXD_PRERR)

				sport->port.icount.parity++;

			else if (rx & URXD_FRMERR)
@@ -398,7 +382,7 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) 
			if (rx & sport->port.ignore_status_mask) {

				if (++ignored > 100)

					goto out;

		goto ignore_char;

				continue;

			}



			rx &= sport->port.read_status_mask;
@@ -413,7 +397,15 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) 
#ifdef SUPPORT_SYSRQ

			sport->port.sysrq = 0;

#endif

	goto error_return;

		}



		tty_insert_flip_char(tty, rx, flg);

	}



out:

	spin_unlock_irqrestore(&sport->port.lock,flags);

	tty_flip_buffer_push(tty);

	return IRQ_HANDLED;

}



/*