提交 c88d8df0 编写于 作者: M Max Filippov 提交者: Chris Zankel

xtensa: ISS: fix rs_put_char

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: NMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NChris Zankel <chris@zankel.net>
上级 50c08f8e
......@@ -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)
......
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