diff options
| author | Guy Martin <gmsoft@tuxicoman.be> | 2010-12-06 16:48:04 +0100 |
|---|---|---|
| committer | AK <andi@firstfloor.org> | 2011-03-31 11:57:52 -0700 |
| commit | f1127642d5214684a533ba465bb62f013c51fe99 (patch) | |
| tree | b488808c28101f5adecd9de7bc1cb71af0a88d57 /arch | |
| parent | e6acb2773a21f1863cf3a7a6831e4a0c2d926011 (diff) | |
parisc : Remove broken line wrapping handling pdc_iodc_print()
commit fbea668498e93bb38ac9226c7af9120a25957375 upstream.
Remove the broken line wrapping handling in pdc_iodc_print().
It is broken in 3 ways :
- It doesn't keep track of the current screen position, it just
assumes that the new buffer will be printed at the begining of the
screen.
- It doesn't take in account that non printable characters won't
increase the current position on the screen.
- And last but not least, it triggers a kernel panic if a backspace
is the first char in the provided buffer :
Backtrace:
[<0000000040128ec4>] pdc_console_write+0x44/0x78
[<0000000040128f18>] pdc_console_tty_write+0x20/0x38
[<000000004032f1ac>] n_tty_write+0x2a4/0x550
[<000000004032b158>] tty_write+0x1e0/0x2d8
[<00000000401bb420>] vfs_write+0xb8/0x188
[<00000000401bb630>] sys_write+0x68/0xb8
[<0000000040104eb8>] syscall_exit+0x0/0x14
Most terminals handle the line wrapping just fine. I've confirmed that
it works correctly on a C8000 with both vga and serial output.
Signed-off-by: Guy Martin <gmsoft@tuxicoman.be>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/kernel/firmware.c | 13 |
1 files changed, 1 insertions, 12 deletions
diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c index df971fa0c32..4896ed09058 100644 --- a/arch/parisc/kernel/firmware.c +++ b/arch/parisc/kernel/firmware.c @@ -1126,15 +1126,13 @@ int pdc_iodc_print(const unsigned char *str, unsigned count) unsigned int i; unsigned long flags; - for (i = 0; i < count && i < 79;) { + for (i = 0; i < count;) { switch(str[i]) { case '\n': iodc_dbuf[i+0] = '\r'; iodc_dbuf[i+1] = '\n'; i += 2; goto print; - case '\b': /* BS */ - i--; /* overwrite last */ default: iodc_dbuf[i] = str[i]; i++; @@ -1142,15 +1140,6 @@ int pdc_iodc_print(const unsigned char *str, unsigned count) } } - /* if we're at the end of line, and not already inserting a newline, - * insert one anyway. iodc console doesn't claim to support >79 char - * lines. don't account for this in the return value. - */ - if (i == 79 && iodc_dbuf[i-1] != '\n') { - iodc_dbuf[i+0] = '\r'; - iodc_dbuf[i+1] = '\n'; - } - print: spin_lock_irqsave(&pdc_lock, flags); real32_call(PAGE0->mem_cons.iodc_io, |