Merge branch 'for_linus' of git://git.infradead.org/~dedekind/ubifs-2.6

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

diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index 025c60a17a4a3c9841d4105bf0344a92f9c31510..0114a78b7cbbe6687892cca1fad58dc76d8883f9 100644 (file)
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -13,6 +13,7 @@
 
 #include <linux/module.h>
 #include <linux/rtc.h>
+#include <linux/smp_lock.h>
 #include "rtc-core.h"
 
 static dev_t rtc_devt;
@@ -26,8 +27,11 @@ static int rtc_dev_open(struct inode *inode, struct file *file)
                                        struct rtc_device, char_dev);
        const struct rtc_class_ops *ops = rtc->ops;
 
-       if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags))
-               return -EBUSY;
+       lock_kernel();
+       if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags)) {
+               err = -EBUSY;
+               goto out;
+       }
 
        file->private_data = rtc;
 
@@ -37,11 +41,13 @@ static int rtc_dev_open(struct inode *inode, struct file *file)
                rtc->irq_data = 0;
                spin_unlock_irq(&rtc->irq_lock);
 
-               return 0;
+               goto out;
        }
 
        /* something has gone wrong */
        clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
+out:
+       unlock_kernel();
        return err;
 }
 
@@ -246,6 +252,15 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
        /* if the driver does not provide the ioctl interface
         * or if that particular ioctl was not implemented
         * (-ENOIOCTLCMD), we will try to emulate here.
+        *
+        * Drivers *SHOULD NOT* provide ioctl implementations
+        * for these requests.  Instead, provide methods to
+        * support the following code, so that the RTC's main
+        * features are accessible without using ioctls.
+        *
+        * RTC and alarm times will be in UTC, by preference,
+        * but dual-booting with MS-Windows implies RTCs must
+        * use the local wall clock time.
         */
 
        switch (cmd) {