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[ARM] 4994/1: <IMX UART>: Move error handling into execution path

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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: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Sascha Hauer 2008-04-17 08:39:22 +01:00 committed by Russell King
parent 8c9915bf31
commit 864eeed051
1 changed files with 33 additions and 41 deletions
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74
drivers/serial/imx.c
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@ -354,66 +354,58 @@ 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++;
temp = readl(sport->port.membase + USR2);
if( temp & USR2_BRCD ) {
if (temp & USR2_BRCD) {
writel(temp | USR2_BRCD, sport->port.membase + USR2);
if(uart_handle_break(&sport->port))
goto ignore_char;
if (uart_handle_break(&sport->port))
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;
if (rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) ) {
if (rx & URXD_PRERR)
sport->port.icount.parity++;
else if (rx & URXD_FRMERR)
sport->port.icount.frame++;
if (rx & URXD_OVRRUN)
sport->port.icount.overrun++;
if (rx & sport->port.ignore_status_mask) {
if (++ignored > 100)
goto out;
continue;
}
rx &= sport->port.read_status_mask;
if (rx & URXD_PRERR)
flg = TTY_PARITY;
else if (rx & URXD_FRMERR)
flg = TTY_FRAME;
if (rx & URXD_OVRRUN)
flg = TTY_OVERRUN;
#ifdef SUPPORT_SYSRQ
sport->port.sysrq = 0;
#endif
}
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)
sport->port.icount.parity++;
else if (rx & URXD_FRMERR)
sport->port.icount.frame++;
if (rx & URXD_OVRRUN)
sport->port.icount.overrun++;
if (rx & sport->port.ignore_status_mask) {
if (++ignored > 100)
goto out;
goto ignore_char;
}
rx &= sport->port.read_status_mask;
if (rx & URXD_PRERR)
flg = TTY_PARITY;
else if (rx & URXD_FRMERR)
flg = TTY_FRAME;
if (rx & URXD_OVRRUN)
flg = TTY_OVERRUN;
#ifdef SUPPORT_SYSRQ
sport->port.sysrq = 0;
#endif
goto error_return;
}
/*