mmtimer: Push BKL down into the ioctl handler

Switches to unlocked_ioctl read to remove ioctl BKL method. Fix the
unknown ioctl return. Probably a nice easy one to kill off BKL usage
entirely later

Signed-off-by: Alan Cox <alan@redhat.com>
Acked-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 15 insertions, 14 deletions

diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c
index 192961fd7173..918711aa56f3 100644
--- a/drivers/char/mmtimer.c
+++ b/drivers/char/mmtimer.c
@@ -32,6 +32,7 @@
 #include <linux/interrupt.h>
 #include <linux/time.h>
 #include <linux/math64.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 #include <asm/sn/addrs.h>
@@ -57,8 +58,8 @@ extern unsigned long sn_rtc_cycles_per_second;
 
 #define rtc_time()              (*RTC_COUNTER_ADDR)
 
-static int mmtimer_ioctl(struct inode *inode, struct file *file,
-                         unsigned int cmd, unsigned long arg);
+static long mmtimer_ioctl(struct file *file, unsigned int cmd,
+                                                unsigned long arg);
 static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma);
 
 /*
@@ -67,9 +68,9 @@ static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma);
 static unsigned long mmtimer_femtoperiod = 0;
 
 static const struct file_operations mmtimer_fops = {
-        .owner =        THIS_MODULE,
-        .mmap =         mmtimer_mmap,
-        .ioctl =        mmtimer_ioctl,
+        .owner = THIS_MODULE,
+        .mmap = mmtimer_mmap,
+        .unlocked_ioctl = mmtimer_ioctl,
 };
 
 /*
@@ -339,7 +340,6 @@ restart:
 
 /**
  * mmtimer_ioctl - ioctl interface for /dev/mmtimer
- * @inode: inode of the device
  * @file: file structure for the device
  * @cmd: command to execute
  * @arg: optional argument to command
@@ -365,11 +365,13 @@ restart:
  * %MMTIMER_GETCOUNTER - Gets the current value in the counter and places it
  * in the address specified by @arg.
  */
-static int mmtimer_ioctl(struct inode *inode, struct file *file,
-                         unsigned int cmd, unsigned long arg)
+static long mmtimer_ioctl(struct file *file, unsigned int cmd,
+                                                unsigned long arg)
 {
         int ret = 0;
 
+        lock_kernel();
+
         switch (cmd) {
         case MMTIMER_GETOFFSET: /* offset of the counter */
                 /*
@@ -384,15 +386,14 @@ static int mmtimer_ioctl(struct inode *inode, struct file *file,
         case MMTIMER_GETRES: /* resolution of the clock in 10^-15 s */
                 if(copy_to_user((unsigned long __user *)arg,
                                 &mmtimer_femtoperiod, sizeof(unsigned long)))
-                        return -EFAULT;
+                        ret = -EFAULT;
                 break;
 
         case MMTIMER_GETFREQ: /* frequency in Hz */
                 if(copy_to_user((unsigned long __user *)arg,
                                 &sn_rtc_cycles_per_second,
                                 sizeof(unsigned long)))
-                        return -EFAULT;
-                ret = 0;
+                        ret = -EFAULT;
                 break;
 
         case MMTIMER_GETBITS: /* number of bits in the clock */
@@ -406,13 +407,13 @@ static int mmtimer_ioctl(struct inode *inode, struct file *file,
         case MMTIMER_GETCOUNTER:
                 if(copy_to_user((unsigned long __user *)arg,
                                 RTC_COUNTER_ADDR, sizeof(unsigned long)))
-                        return -EFAULT;
+                        ret = -EFAULT;
                 break;
         default:
-                ret = -ENOSYS;
+                ret = -ENOTTY;
                 break;
         }
-
+        unlock_kernel();
         return ret;
 }