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authorCHIKAMA masaki <masaki.chikama@gmail.com>2008-06-05 22:46:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-06-06 11:29:11 -0700
commit879000f94442860e72c934f9e568989bc7fb8ec4 (patch)
treec6d9aa713735deb49503ca9c65edbc8d557f3a71 /drivers/cpufreq
parent10732c35dff6c2e15e413e7806a7114a2faa0ecf (diff)
downloadlinux-879000f94442860e72c934f9e568989bc7fb8ec4.tar.bz2
cpufreq: fix null object access on Transmeta CPU
If cpu specific cpufreq driver(i.e. longrun) has "setpolicy" function, governor object isn't set into cpufreq_policy object at "__cpufreq_set_policy" function in driver/cpufreq/cpufreq.c . This causes a null object access at "store_scaling_setspeed" and "show_scaling_setspeed" function in driver/cpufreq/cpufreq.c when reading or writing through /sys interface (ex. cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed) Addresses: http://bugzilla.kernel.org/show_bug.cgi?id=10654 https://bugzilla.redhat.com/show_bug.cgi?id=443354 Signed-off-by: CHIKAMA Masaki <masaki.chikama@gmail.com> Cc: Dave Jones <davej@codemonkey.org.uk> Cc: Chuck Ebbert <cebbert@redhat.com> Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 86f0a2430624..4e07d1f43a43 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -625,7 +625,7 @@ static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy,
unsigned int freq = 0;
unsigned int ret;
- if (!policy->governor->store_setspeed)
+ if (!policy->governor || !policy->governor->store_setspeed)
return -EINVAL;
ret = sscanf(buf, "%u", &freq);
@@ -639,7 +639,7 @@ static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy,
static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf)
{
- if (!policy->governor->show_setspeed)
+ if (!policy->governor || !policy->governor->show_setspeed)
return sprintf(buf, "<unsupported>\n");
return policy->governor->show_setspeed(policy, buf);