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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2006-03-12 10:55:01 +1100
committerPaul Mackerras <paulus@samba.org>2006-03-16 16:55:02 +1100
commitc6cb3b5f368bae67c0b258cfebc0b9dbd8e1d929 (patch)
treee50019d058117bac9530539ada13dc43af99bbcc
parentcd9c99d7e5f75e137c2ea0cf693773d63c8d945c (diff)
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[PATCH] powerpc: enable NAP only on cpus who support it to avoid memory corruption
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>
-rw-r--r--arch/powerpc/platforms/powermac/feature.c9
-rw-r--r--arch/powerpc/platforms/powermac/setup.c4
2 files changed, 4 insertions, 9 deletions
diff --git a/arch/powerpc/platforms/powermac/feature.c b/arch/powerpc/platforms/powermac/feature.c
index 34714d3ea69..bbe794891a2 100644
--- a/arch/powerpc/platforms/powermac/feature.c
+++ b/arch/powerpc/platforms/powermac/feature.c
@@ -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))
diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c
index 1955462f408..29c2946f1c7 100644
--- a/arch/powerpc/platforms/powermac/setup.c
+++ b/arch/powerpc/platforms/powermac/setup.c
@@ -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"));