[Xen-devel] [PATCH v2 4/6] hwmon: use smp_call_sync_on_phys_cpu() for dell-smm i8k

[Juergen Gross <jgross@xxxxxxxx>]

Use the smp_call_sync_on_phys_cpu() function to call system management
mode on cpu 0.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 drivers/hwmon/dell-smm-hwmon.c | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index c43318d..4875462 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -130,23 +130,15 @@ static inline const char *i8k_get_dmi_data(int field)
 /*
  * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
  */
-static int i8k_smm(struct smm_regs *regs)
+static int i8k_smm_func(void *par)
 {
        int rc;
+       struct smm_regs *regs = par;
        int eax = regs->eax;
-       cpumask_var_t old_mask;
 
        /* SMM requires CPU 0 */
-       if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
-               return -ENOMEM;
-       cpumask_copy(old_mask, &current->cpus_allowed);
-       rc = set_cpus_allowed_ptr(current, cpumask_of(0));
-       if (rc)
-               goto out;
-       if (smp_processor_id() != 0) {
-               rc = -EBUSY;
-               goto out;
-       }
+       if (smp_processor_id() != 0)
+               return -EBUSY;
 
 #if defined(CONFIG_X86_64)
        asm volatile("pushq %%rax\n\t"
@@ -204,13 +196,18 @@ static int i8k_smm(struct smm_regs *regs)
        if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
                rc = -EINVAL;
 
-out:
-       set_cpus_allowed_ptr(current, old_mask);
-       free_cpumask_var(old_mask);
        return rc;
 }
 
 /*
+ * Call the System Management Mode BIOS.
+ */
+static int i8k_smm(struct smm_regs *regs)
+{
+       return smp_call_sync_on_phys_cpu(0, i8k_smm_func, regs);
+}
+
+/*
  * Read the fan status.
  */
 static int i8k_get_fan_status(int fan)
-- 
2.6.2


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