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[PATCH] powerpc: enable NAP only on cpus who support it to avoid memory corruption

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This patch fixes incorrect setting of powersave_nap to 1 on all
PowerMacs, potentially causing memory corruption on some models. This
bug was introuced by me during the 32/64 bits merge.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt 2006-03-12 10:55:01 +11:00 committed by Paul Mackerras
parent cd9c99d7e5
commit c6cb3b5f36
2 changed files with 4 additions and 9 deletions
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9
arch/powerpc/platforms/powermac/feature.c
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@ -2491,9 +2491,7 @@ found:
pmac_mb.model_id = PMAC_TYPE_COMET;
iounmap(mach_id_ptr);
}
#endif /* CONFIG_POWER4 */
#ifdef CONFIG_6xx
/* Set default value of powersave_nap on machines that support it.
* It appears that uninorth rev 3 has a problem with it, we don't
* enable it on those. In theory, the flush-on-lock property is
@ -2522,10 +2520,11 @@ found:
* NAP mode
*/
powersave_lowspeed = 1;
#endif /* CONFIG_6xx */
#ifdef CONFIG_POWER4
#else /* CONFIG_POWER4 */
powersave_nap = 1;
#endif
#endif /* CONFIG_POWER4 */
/* Check for "mobile" machine */
if (model && (strncmp(model, "PowerBook", 9) == 0
|| strncmp(model, "iBook", 5) == 0))

4
arch/powerpc/platforms/powermac/setup.c
View File

@ -621,10 +621,6 @@ static void __init pmac_init_early(void)
/* Probe motherboard chipset */
pmac_feature_init();
/* We can NAP */
powersave_nap = 1;
printk(KERN_INFO "Using native/NAP idle loop\n");
/* Initialize debug stuff */
udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
udbg_adb_init(!!strstr(cmd_line, "btextdbg"));