irq: Remove superfluous NULL pointer check in check_irq_resend()

[safe/jmp/linux-2.6] / kernel / irq / proc.c

diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index fac014a..692363d 100644 (file)
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -20,11 +20,11 @@ static struct proc_dir_entry *root_irq_dir;
 static int irq_affinity_proc_show(struct seq_file *m, void *v)
 {
        struct irq_desc *desc = irq_to_desc((long)m->private);
-       cpumask_t *mask = &desc->affinity;
+       const struct cpumask *mask = desc->affinity;
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
        if (desc->status & IRQ_MOVE_PENDING)
-               mask = &desc->pending_mask;
+               mask = desc->pending_mask;
 #endif
        seq_cpumask(m, mask);
        seq_putc(m, '\n');
@@ -40,33 +40,42 @@ static ssize_t irq_affinity_proc_write(struct file *file,
                const char __user *buffer, size_t count, loff_t *pos)
 {
        unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
-       cpumask_t new_value;
+       cpumask_var_t new_value;
        int err;
 
        if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity ||
            irq_balancing_disabled(irq))
                return -EIO;
 
+       if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
+               return -ENOMEM;
+
        err = cpumask_parse_user(buffer, count, new_value);
        if (err)
-               return err;
+               goto free_cpumask;
 
-       if (!is_affinity_mask_valid(new_value))
-               return -EINVAL;
+       if (!is_affinity_mask_valid(new_value)) {
+               err = -EINVAL;
+               goto free_cpumask;
+       }
 
        /*
         * Do not allow disabling IRQs completely - it's a too easy
         * way to make the system unusable accidentally :-) At least
         * one online CPU still has to be targeted.
         */
-       if (!cpus_intersects(new_value, cpu_online_map))
+       if (!cpumask_intersects(new_value, cpu_online_mask)) {
                /* Special case for empty set - allow the architecture
                   code to set default SMP affinity. */
-               return irq_select_affinity(irq) ? -EINVAL : count;
-
-       irq_set_affinity(irq, new_value);
+               err = irq_select_affinity_usr(irq) ? -EINVAL : count;
+       } else {
+               irq_set_affinity(irq, new_value);
+               err = count;
+       }
 
-       return count;
+free_cpumask:
+       free_cpumask_var(new_value);
+       return err;
 }
 
 static int irq_affinity_proc_open(struct inode *inode, struct file *file)
@@ -84,7 +93,7 @@ static const struct file_operations irq_affinity_proc_fops = {
 
 static int default_affinity_show(struct seq_file *m, void *v)
 {
-       seq_cpumask(m, &irq_default_affinity);
+       seq_cpumask(m, irq_default_affinity);
        seq_putc(m, '\n');
        return 0;
 }
@@ -92,27 +101,37 @@ static int default_affinity_show(struct seq_file *m, void *v)
 static ssize_t default_affinity_write(struct file *file,
                const char __user *buffer, size_t count, loff_t *ppos)
 {
-       cpumask_t new_value;
+       cpumask_var_t new_value;
        int err;
 
+       if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
+               return -ENOMEM;
+
        err = cpumask_parse_user(buffer, count, new_value);
        if (err)
-               return err;
+               goto out;
 
-       if (!is_affinity_mask_valid(new_value))
-               return -EINVAL;
+       if (!is_affinity_mask_valid(new_value)) {
+               err = -EINVAL;
+               goto out;
+       }
 
        /*
         * Do not allow disabling IRQs completely - it's a too easy
         * way to make the system unusable accidentally :-) At least
         * one online CPU still has to be targeted.
         */
-       if (!cpus_intersects(new_value, cpu_online_map))
-               return -EINVAL;
+       if (!cpumask_intersects(new_value, cpu_online_mask)) {
+               err = -EINVAL;
+               goto out;
+       }
 
-       irq_default_affinity = new_value;
+       cpumask_copy(irq_default_affinity, new_value);
+       err = count;
 
-       return count;
+out:
+       free_cpumask_var(new_value);
+       return err;
 }
 
 static int default_affinity_open(struct inode *inode, struct file *file)
@@ -220,7 +239,7 @@ void unregister_handler_proc(unsigned int irq, struct irqaction *action)
        }
 }
 
-void register_default_affinity_proc(void)
+static void register_default_affinity_proc(void)
 {
 #ifdef CONFIG_SMP
        proc_create("irq/default_smp_affinity", 0600, NULL,
@@ -243,7 +262,11 @@ void init_irq_proc(void)
        /*
         * Create entries for all existing IRQs.
         */
-       for_each_irq_desc(irq, desc)
+       for_each_irq_desc(irq, desc) {
+               if (!desc)
+                       continue;
+
                register_irq_proc(irq, desc);
+       }
 }