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

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>

1 files changed, 2 insertions, 10 deletions

diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c
index 4c247e02d9b1..df971fa0c32f 100644
--- a/arch/parisc/kernel/firmware.c
+++ b/arch/parisc/kernel/firmware.c
@@ -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;
                 }
         }