unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

parisc: pass through '\t' to early (iodc) console

Browse source 
The firmware handles '\t' internally, so stop trying to emulate it
(which, incidentally, had a bug in it.)

Fixes a really weird hang at bootup in rcu_bootup_announce, which,
as far as I can tell, is the first printk in the core kernel to use
a tab as the first character.

Cc: stable@kernel.org
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kyle McMartin 2010-08-03 20:38:08 -04:00 committed by Linus Torvalds
parent f46e9913fa
commit d9b68e5e88
1 changed files with 2 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
arch/parisc/kernel/firmware.c
View file

@ -1123,7 +1123,6 @@ static char __attribute__((aligned(64))) iodc_dbuf[4096];
*/
int pdc_iodc_print(const unsigned char *str, unsigned count)
{
static int posx; /* for simple TAB-Simulation... */
unsigned int i;
unsigned long flags;
@ -1133,19 +1132,12 @@ int pdc_iodc_print(const unsigned char *str, unsigned count)
iodc_dbuf[i+0] = '\r';
iodc_dbuf[i+1] = '\n';
i += 2;
posx = 0;
goto print;
case '\t':
while (posx & 7) {
iodc_dbuf[i] = ' ';
i++, posx++;
}
break;
case '\b': /* BS */
posx -= 2;
i--; /* overwrite last */
default:
iodc_dbuf[i] = str[i];
i++, posx++;
i++;
break;
}
}