efirtc: push down the BKL

Push it down as far as the EFI method calls.  Someone who knows EFI can do
the other bits.  Also fix another wrong unknown ioctl return.
Signed-off-by: NAlan Cox <alan@redhat.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/char/efirtc.c

@@ -37,8 +37,9 @@
 #include <linux/rtc.h>
 #include <linux/proc_fs.h>
 #include <linux/efi.h>
+#include <linux/smp_lock.h>
+#include <linux/uaccess.h>
 
-#include <asm/uaccess.h>
 #include <asm/system.h>
 
 #define EFI_RTC_VERSION		"0.4"
@@ -51,8 +52,8 @@
 
 static DEFINE_SPINLOCK(efi_rtc_lock);
 
-static int efi_rtc_ioctl(struct inode *inode, struct file *file,
-		     unsigned int cmd, unsigned long arg);
+static long efi_rtc_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg);
 
 #define is_leap(year) \
           ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
@@ -146,9 +147,8 @@ convert_from_efi_time(efi_time_t *eft, struct rtc_time *wtime)
 	}
 }
 
-static int
-efi_rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-		     unsigned long arg)
+static long efi_rtc_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
 {
 
 	efi_status_t	status;
@@ -175,13 +175,13 @@ efi_rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 			return -EINVAL;
 
 		case RTC_RD_TIME:
-
+			lock_kernel();
 			spin_lock_irqsave(&efi_rtc_lock, flags);
 
 			status = efi.get_time(&eft, &cap);
 
 			spin_unlock_irqrestore(&efi_rtc_lock,flags);
-
+			unlock_kernel();
 			if (status != EFI_SUCCESS) {
 				/* should never happen */
 				printk(KERN_ERR "efitime: can't read time\n");
@@ -203,11 +203,13 @@ efi_rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 
 			convert_to_efi_time(&wtime, &eft);
 
+			lock_kernel();
 			spin_lock_irqsave(&efi_rtc_lock, flags);
 
 			status = efi.set_time(&eft);
 
 			spin_unlock_irqrestore(&efi_rtc_lock,flags);
+			unlock_kernel();
 
 			return status == EFI_SUCCESS ? 0 : -EINVAL;
 
@@ -223,6 +225,7 @@ efi_rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 
 			convert_to_efi_time(&wtime, &eft);
 
+			lock_kernel();
 			spin_lock_irqsave(&efi_rtc_lock, flags);
 			/*
 			 * XXX Fixme:
@@ -233,16 +236,19 @@ efi_rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 			status = efi.set_wakeup_time((efi_bool_t)enabled, &eft);
 
 			spin_unlock_irqrestore(&efi_rtc_lock,flags);
+			unlock_kernel();
 
 			return status == EFI_SUCCESS ? 0 : -EINVAL;
 
 		case RTC_WKALM_RD:
 
+			lock_kernel();
 			spin_lock_irqsave(&efi_rtc_lock, flags);
 
 			status = efi.get_wakeup_time((efi_bool_t *)&enabled, (efi_bool_t *)&pending, &eft);
 
 			spin_unlock_irqrestore(&efi_rtc_lock,flags);
+			unlock_kernel();
 
 			if (status != EFI_SUCCESS) return -EINVAL;
 
@@ -256,7 +262,7 @@ efi_rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 			return copy_to_user(&ewp->time, &wtime,
 					    sizeof(struct rtc_time)) ? -EFAULT : 0;
 	}
-	return -EINVAL;
+	return -ENOTTY;
 }
 
 /*
@@ -265,8 +271,7 @@ efi_rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
  *	up things on a close.
  */
 
-static int
-efi_rtc_open(struct inode *inode, struct file *file)
+static int efi_rtc_open(struct inode *inode, struct file *file)
 {
 	/*
 	 * nothing special to do here
@@ -277,8 +282,7 @@ efi_rtc_open(struct inode *inode, struct file *file)
 	return 0;
 }
 
-static int
-efi_rtc_close(struct inode *inode, struct file *file)
+static int efi_rtc_close(struct inode *inode, struct file *file)
 {
 	return 0;
 }
@@ -289,13 +293,12 @@ efi_rtc_close(struct inode *inode, struct file *file)
 
 static const struct file_operations efi_rtc_fops = {
 	.owner		= THIS_MODULE,
-	.ioctl		= efi_rtc_ioctl,
+	.unlocked_ioctl	= efi_rtc_ioctl,
 	.open		= efi_rtc_open,
 	.release	= efi_rtc_close,
 };
 
-static struct miscdevice efi_rtc_dev=
-{
+static struct miscdevice efi_rtc_dev= {
 	EFI_RTC_MINOR,
 	"efirtc",
 	&efi_rtc_fops