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| author | Julia Lawall <julia@diku.dk> | 2008-07-25 22:44:53 +0200 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2008-10-09 13:52:43 -0400 |
| commit | f1829e4a371f26430185a9d5b97b8d9d19824e08 (patch) | |
| tree | e93626b049d174430d1431708398a90a4b756ed5 /drivers/cpufreq/cpufreq.c | |
| parent | 888a794cacd8950ac6be701db20b62a4ab2ce90c (diff) | |
| download | linux-f1829e4a371f26430185a9d5b97b8d9d19824e08.tar.gz linux-f1829e4a371f26430185a9d5b97b8d9d19824e08.tar.bz2 linux-f1829e4a371f26430185a9d5b97b8d9d19824e08.zip | |
[CPUFREQ] drivers/cpufreq/cpufreq.c: Adjust error handling code involving cpufreq_cpu_put
After calling cpufreq_cpu_get, error handling code should call
cpufreq_cpu_put.
The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@r@
expression x,E;
statement S;
position p1,p2,p3;
@@
(
if ((x = cpufreq_cpu_get@p1(...)) == NULL || ...) S
|
x = cpufreq_cpu_get@p1(...)
... when != x
if (x == NULL || ...) S
)
<...
if@p3 (...) { ... when != cpufreq_cpu_put(x)
when != if (x) { ... cpufreq_cpu_put(x); ...}
return@p2 ...;
}
...>
(
return x;
|
return 0;
|
x = E
|
E = x
|
cpufreq_cpu_put(x)
)
@exists@
position r.p1,r.p2,r.p3;
expression x;
int ret != 0;
statement S;
@@
* x = cpufreq_cpu_get@p1(...)
<...
* if@p3 (...)
S
...>
* return@p2 \(NULL\|ret\);
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 8a67f16987db..9bbdc258624c 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1467,20 +1467,22 @@ int cpufreq_driver_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation) { - int ret; + int ret = -EINVAL; policy = cpufreq_cpu_get(policy->cpu); if (!policy) - return -EINVAL; + goto no_policy; if (unlikely(lock_policy_rwsem_write(policy->cpu))) - return -EINVAL; + goto fail; ret = __cpufreq_driver_target(policy, target_freq, relation); unlock_policy_rwsem_write(policy->cpu); +fail: cpufreq_cpu_put(policy); +no_policy: return ret; } EXPORT_SYMBOL_GPL(cpufreq_driver_target); @@ -1717,13 +1719,17 @@ int cpufreq_update_policy(unsigned int cpu) { struct cpufreq_policy *data = cpufreq_cpu_get(cpu); struct cpufreq_policy policy; - int ret = 0; + int ret; - if (!data) - return -ENODEV; + if (!data) { + ret = -ENODEV; + goto no_policy; + } - if (unlikely(lock_policy_rwsem_write(cpu))) - return -EINVAL; + if (unlikely(lock_policy_rwsem_write(cpu))) { + ret = -EINVAL; + goto fail; + } dprintk("updating policy for CPU %u\n", cpu); memcpy(&policy, data, sizeof(struct cpufreq_policy)); @@ -1750,7 +1756,9 @@ int cpufreq_update_policy(unsigned int cpu) unlock_policy_rwsem_write(cpu); +fail: cpufreq_cpu_put(data); +no_policy: return ret; } EXPORT_SYMBOL(cpufreq_update_policy); |