USB: musb: minor locking fix

[safe/jmp/linux-2.6] / drivers / rtc / rtc-dev.c

diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index 0a870b7..45152f4 100644 (file)
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -13,7 +13,6 @@
 
 #include <linux/module.h>
 #include <linux/rtc.h>
-#include <linux/smp_lock.h>
 #include "rtc-core.h"
 
 static dev_t rtc_devt;
@@ -27,11 +26,8 @@ static int rtc_dev_open(struct inode *inode, struct file *file)
                                        struct rtc_device, char_dev);
        const struct rtc_class_ops *ops = rtc->ops;
 
-       lock_kernel();
-       if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags)) {
-               err = -EBUSY;
-               goto out;
-       }
+       if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags))
+               return -EBUSY;
 
        file->private_data = rtc;
 
@@ -41,13 +37,11 @@ static int rtc_dev_open(struct inode *inode, struct file *file)
                rtc->irq_data = 0;
                spin_unlock_irq(&rtc->irq_lock);
 
-               goto out;
+               return 0;
        }
 
        /* something has gone wrong */
        clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
-out:
-       unlock_kernel();
        return err;
 }
 
@@ -98,10 +92,10 @@ static void rtc_uie_timer(unsigned long data)
        spin_unlock_irqrestore(&rtc->irq_lock, flags);
 }
 
-static void clear_uie(struct rtc_device *rtc)
+static int clear_uie(struct rtc_device *rtc)
 {
        spin_lock_irq(&rtc->irq_lock);
-       if (rtc->irq_active) {
+       if (rtc->uie_irq_active) {
                rtc->stop_uie_polling = 1;
                if (rtc->uie_timer_active) {
                        spin_unlock_irq(&rtc->irq_lock);
@@ -114,9 +108,10 @@ static void clear_uie(struct rtc_device *rtc)
                        flush_scheduled_work();
                        spin_lock_irq(&rtc->irq_lock);
                }
-               rtc->irq_active = 0;
+               rtc->uie_irq_active = 0;
        }
        spin_unlock_irq(&rtc->irq_lock);
+       return 0;
 }
 
 static int set_uie(struct rtc_device *rtc)
@@ -128,8 +123,8 @@ static int set_uie(struct rtc_device *rtc)
        if (err)
                return err;
        spin_lock_irq(&rtc->irq_lock);
-       if (!rtc->irq_active) {
-               rtc->irq_active = 1;
+       if (!rtc->uie_irq_active) {
+               rtc->uie_irq_active = 1;
                rtc->stop_uie_polling = 0;
                rtc->oldsecs = tm.tm_sec;
                rtc->uie_task_active = 1;
@@ -140,6 +135,16 @@ static int set_uie(struct rtc_device *rtc)
        spin_unlock_irq(&rtc->irq_lock);
        return 0;
 }
+
+int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc, unsigned int enabled)
+{
+       if (enabled)
+               return set_uie(rtc);
+       else
+               return clear_uie(rtc);
+}
+EXPORT_SYMBOL(rtc_dev_update_irq_enable_emul);
+
 #endif /* CONFIG_RTC_INTF_DEV_UIE_EMUL */
 
 static ssize_t
@@ -221,7 +226,7 @@ static long rtc_dev_ioctl(struct file *file,
 
        err = mutex_lock_interruptible(&rtc->ops_lock);
        if (err)
-               return -EBUSY;
+               return err;
 
        /* check that the calling task has appropriate permissions
         * for certain ioctls. doing this check here is useful
@@ -363,6 +368,22 @@ static long rtc_dev_ioctl(struct file *file,
                err = rtc_irq_set_state(rtc, NULL, 0);
                break;
 
+       case RTC_AIE_ON:
+               mutex_unlock(&rtc->ops_lock);
+               return rtc_alarm_irq_enable(rtc, 1);
+
+       case RTC_AIE_OFF:
+               mutex_unlock(&rtc->ops_lock);
+               return rtc_alarm_irq_enable(rtc, 0);
+
+       case RTC_UIE_ON:
+               mutex_unlock(&rtc->ops_lock);
+               return rtc_update_irq_enable(rtc, 1);
+
+       case RTC_UIE_OFF:
+               mutex_unlock(&rtc->ops_lock);
+               return rtc_update_irq_enable(rtc, 0);
+
        case RTC_IRQP_SET:
                err = rtc_irq_set_freq(rtc, NULL, arg);
                break;
@@ -407,14 +428,6 @@ static long rtc_dev_ioctl(struct file *file,
                        err = -EFAULT;
                return err;
 
-#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
-       case RTC_UIE_OFF:
-               clear_uie(rtc);
-               break;
-
-       case RTC_UIE_ON:
-               err = set_uie(rtc);
-#endif
        default:
                err = -ENOTTY;
                break;
@@ -425,13 +438,30 @@ done:
        return err;
 }
 
+static int rtc_dev_fasync(int fd, struct file *file, int on)
+{
+       struct rtc_device *rtc = file->private_data;
+       return fasync_helper(fd, file, on, &rtc->async_queue);
+}
+
 static int rtc_dev_release(struct inode *inode, struct file *file)
 {
        struct rtc_device *rtc = file->private_data;
 
-#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
-       clear_uie(rtc);
-#endif
+       /* We shut down the repeating IRQs that userspace enabled,
+        * since nothing is listening to them.
+        *  - Update (UIE) ... currently only managed through ioctls
+        *  - Periodic (PIE) ... also used through rtc_*() interface calls
+        *
+        * Leave the alarm alone; it may be set to trigger a system wakeup
+        * later, or be used by kernel code, and is a one-shot event anyway.
+        */
+
+       /* Keep ioctl until all drivers are converted */
+       rtc_dev_ioctl(file, RTC_UIE_OFF, 0);
+       rtc_update_irq_enable(rtc, 0);
+       rtc_irq_set_state(rtc, NULL, 0);
+
        if (rtc->ops->release)
                rtc->ops->release(rtc->dev.parent);
 
@@ -439,12 +469,6 @@ static int rtc_dev_release(struct inode *inode, struct file *file)
        return 0;
 }
 
-static int rtc_dev_fasync(int fd, struct file *file, int on)
-{
-       struct rtc_device *rtc = file->private_data;
-       return fasync_helper(fd, file, on, &rtc->async_queue);
-}
-
 static const struct file_operations rtc_dev_fops = {
        .owner          = THIS_MODULE,
        .llseek         = no_llseek,