This patch avoids recursive crash (leading to kernel stack overflow) in
die() on CHRP/PReP machines when CONFIG_PMAC_BACKLIGHT=y.
set_backlight_* functions are placed in pmac section, which is discarded
when _machine != _MACH_Pmac.
I already posted this patch to LKML few months ago:
http://www.ussg.iu.edu/hypermail/linux/kernel/0412.0/0300.html
and it has been applied to linux-2.4 tree, but still not 2.6.
(patch was made against 2.4.27, but still applies cleanly against
kernels up to 2.6.11.12)
Signed-off-by: Jakub Bogusz <[email protected]>
--- linux-2.4.27/arch/ppc/kernel/traps.c.orig Wed Apr 14 15:05:27 2004
+++ linux-2.4.27/arch/ppc/kernel/traps.c Mon Nov 29 19:05:28 2004
@@ -88,8 +88,10 @@
console_verbose();
spin_lock_irq(&die_lock);
#ifdef CONFIG_PMAC_BACKLIGHT
- set_backlight_enable(1);
- set_backlight_level(BACKLIGHT_MAX);
+ if (_machine == _MACH_Pmac) {
+ set_backlight_enable(1);
+ set_backlight_level(BACKLIGHT_MAX);
+ }
#endif
printk("Oops: %s, sig: %ld\n", str, err);
show_regs(fp);
--
Jakub Bogusz http://qboosh.cs.net.pl/
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