diff options
Diffstat (limited to 'drivers/firmware/dcdbas.c')
| -rw-r--r-- | drivers/firmware/dcdbas.c | 49 |
1 files changed, 18 insertions, 31 deletions
diff --git a/drivers/firmware/dcdbas.c b/drivers/firmware/dcdbas.c index 18d65fb42ee7..e8727817c8b5 100644 --- a/drivers/firmware/dcdbas.c +++ b/drivers/firmware/dcdbas.c @@ -237,6 +237,23 @@ static ssize_t host_control_on_shutdown_store(struct device *dev, return count; } +static long generate_smi(void *_smi_cmd) +{ + struct smi_cmd *smi_cmd = _smi_cmd; + + /* generate SMI */ + asm volatile ( + "outb %b0,%w1" + : /* no output args */ + : "a" (smi_cmd->command_code), + "d" (smi_cmd->command_address), + "b" (smi_cmd->ebx), + "c" (smi_cmd->ecx) + : "memory" + ); + return 0; +} + /** * dcdbas_smi_request: generate SMI request * @@ -244,9 +261,6 @@ static ssize_t host_control_on_shutdown_store(struct device *dev, */ int dcdbas_smi_request(struct smi_cmd *smi_cmd) { - cpumask_var_t old_mask; - int ret = 0; - if (smi_cmd->magic != SMI_CMD_MAGIC) { dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n", __func__); @@ -254,35 +268,8 @@ int dcdbas_smi_request(struct smi_cmd *smi_cmd) } /* SMI requires CPU 0 */ - 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)); - if (smp_processor_id() != 0) { - dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n", - __func__); - ret = -EBUSY; - goto out; - } - - /* generate SMI */ - asm volatile ( - "outb %b0,%w1" - : /* no output args */ - : "a" (smi_cmd->command_code), - "d" (smi_cmd->command_address), - "b" (smi_cmd->ebx), - "c" (smi_cmd->ecx) - : "memory" - ); - -out: - set_cpus_allowed_ptr(current, old_mask); - free_cpumask_var(old_mask); - return ret; + return work_on_cpu(0, generate_smi, smi_cmd); } - /** * smi_request_store: * |