diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2014-06-21 17:08:08 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-10 01:45:36 +0200 |
| commit | 6d827fbcc370ca259a2905309f64161ab7b10596 (patch) | |
| tree | a9f92ac3d796ca010b7d9bcb7c1b5d8a0ef8da3f /drivers/char | |
| parent | Drivers: hv: util: Fix a bug in the KVP code (diff) | |
| download | linux-6d827fbcc370ca259a2905309f64161ab7b10596.tar.xz linux-6d827fbcc370ca259a2905309f64161ab7b10596.zip | |
i8k: Fix non-SMP operation
Commit f36fdb9f0266 (i8k: Force SMM to run on CPU 0) adds support
for multi-core CPUs to the driver. Unfortunately, that causes it
to fail loading if compiled without SMP support, at least on
32 bit kernels. Kernel log shows "i8k: unable to get SMM Dell
signature", and function i8k_smm is found to return -EINVAL.
Testing revealed that the culprit is the missing return value check
of set_cpus_allowed_ptr.
Fixes: f36fdb9f0266 (i8k: Force SMM to run on CPU 0)
Reported-by: Jim Bos <jim876@xs4all.nl>
Tested-by: Jim Bos <jim876@xs4all.nl>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Cc: Andreas Mohr <andi@lisas.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/i8k.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c index d915707d2ba1..93dcad0c1cbe 100644 --- a/drivers/char/i8k.c +++ b/drivers/char/i8k.c @@ -138,7 +138,9 @@ static int i8k_smm(struct smm_regs *regs) if (!alloc_cpumask_var(&old_mask, GFP_KERNEL)) return -ENOMEM; cpumask_copy(old_mask, ¤t->cpus_allowed); - set_cpus_allowed_ptr(current, cpumask_of(0)); + rc = set_cpus_allowed_ptr(current, cpumask_of(0)); + if (rc) + goto out; if (smp_processor_id() != 0) { rc = -EBUSY; goto out; |