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xtensa: ISS: fix rs_put_char

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ISS serial console prints garbage instead of symbols printed via
rs_put_char. gcc optimizes away putting prined symbol into memory buffer
because there's no evidence that the buffer is used afterwards.

Make rs_put_char and rs_write use simc_write that has explicit wmb.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Max Filippov 2012-10-15 03:55:33 +04:00 committed by Chris Zankel
parent 50c08f8e9f
commit c88d8df0cc
1 changed files with 2 additions and 7 deletions
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9
arch/xtensa/platforms/iss/console.c
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@ -91,7 +91,7 @@ static int rs_write(struct tty_struct * tty,
{
/* see drivers/char/serialX.c to reference original version */
__simc (SYS_write, 1, (unsigned long)buf, count, 0, 0);
simc_write(1, buf, count);
return count;
}
@ -122,12 +122,7 @@ static void rs_poll(unsigned long priv)
static int rs_put_char(struct tty_struct *tty, unsigned char ch)
{
char buf[2];
buf[0] = ch;
buf[1] = '\0'; /* Is this NULL necessary? */
__simc (SYS_write, 1, (unsigned long) buf, 1, 0, 0);
return 1;
return rs_write(tty, &ch, 1);
}
static void rs_flush_chars(struct tty_struct *tty)