cris: push down BKL into some device drivers

A number of cris specific device drivers still use the
locked ->ioctl operation. Convert them to unlocked_ioctl
with explicit lock_kernel calls.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>

4 files changed, 60 insertions, 22 deletions

diff --git a/arch/cris/arch-v10/drivers/ds1302.c b/arch/cris/arch-v10/drivers/ds1302.c
index 77630df9434..884275629ef 100644
--- a/arch/cris/arch-v10/drivers/ds1302.c
+++ b/arch/cris/arch-v10/drivers/ds1302.c
@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/miscdevice.h>
 #include <linux/delay.h>
+#include <linux/smp_lock.h>
 #include <linux/bcd.h>
 #include <linux/capability.h>
 
@@ -238,9 +239,7 @@ static unsigned char days_in_mo[] =
 
 /* ioctl that supports RTC_RD_TIME and RTC_SET_TIME (read and set time/date). */
 
-static int
-rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-          unsigned long arg) 
+static int rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
         unsigned long flags;
 
@@ -354,6 +353,17 @@ rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
         }
 }
 
+static long rtc_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        int ret;
+
+        lock_kernel();
+        ret = rtc_ioctl(file, cmd, arg);
+        unlock_kernel();
+
+        return ret;
+}
+
 static void
 print_rtc_status(void)
 {
@@ -375,8 +385,8 @@ print_rtc_status(void)
 /* The various file operations we support. */
 
 static const struct file_operations rtc_fops = {
-        .owner =        THIS_MODULE,
-        .ioctl =        rtc_ioctl,
+        .owner          = THIS_MODULE,
+        .unlocked_ioctl = rtc_unlocked_ioctl,
 }; 
 
 /* Probe for the chip by writing something to its RAM and try reading it back. */
diff --git a/arch/cris/arch-v10/drivers/pcf8563.c b/arch/cris/arch-v10/drivers/pcf8563.c
index 1e90c1a9c84..7dcb1f85f42 100644
--- a/arch/cris/arch-v10/drivers/pcf8563.c
+++ b/arch/cris/arch-v10/drivers/pcf8563.c
@@ -27,6 +27,7 @@
 #include <linux/delay.h>
 #include <linux/bcd.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 #include <asm/system.h>
@@ -53,7 +54,7 @@ static DEFINE_MUTEX(rtc_lock); /* Protect state etc */
 static const unsigned char days_in_month[] =
         { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
 
-int pcf8563_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
+static long pcf8563_unlocked_ioctl(struct file *, unsigned int, unsigned long);
 
 /* Cache VL bit value read at driver init since writing the RTC_SECOND
  * register clears the VL status.
@@ -62,7 +63,7 @@ static int voltage_low;
 
 static const struct file_operations pcf8563_fops = {
         .owner = THIS_MODULE,
-        .ioctl = pcf8563_ioctl,
+        .unlocked_ioctl = pcf8563_unlocked_ioctl,
 };
 
 unsigned char
@@ -212,8 +213,7 @@ pcf8563_exit(void)
  * ioctl calls for this driver. Why return -ENOTTY upon error? Because
  * POSIX says so!
  */
-int pcf8563_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
-        unsigned long arg)
+static int pcf8563_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
         /* Some sanity checks. */
         if (_IOC_TYPE(cmd) != RTC_MAGIC)
@@ -339,6 +339,17 @@ int pcf8563_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
         return 0;
 }
 
+static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+        int ret;
+
+        lock_kernel();
+        return pcf8563_ioctl(filp, cmd, arg);
+        unlock_kernel();
+
+        return ret;
+}
+
 static int __init pcf8563_register(void)
 {
         if (pcf8563_init() < 0) {
diff --git a/arch/cris/arch-v32/drivers/i2c.c b/arch/cris/arch-v32/drivers/i2c.c
index 506826399ae..2fd6a740d89 100644
--- a/arch/cris/arch-v32/drivers/i2c.c
+++ b/arch/cris/arch-v32/drivers/i2c.c
@@ -649,10 +649,10 @@ i2c_release(struct inode *inode, struct file *filp)
 /* Main device API. ioctl's to write or read to/from i2c registers.
  */
 
-static int
-i2c_ioctl(struct inode *inode, struct file *file,
-          unsigned int cmd, unsigned long arg)
+static long
+i2c_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
+        int ret;
         if(_IOC_TYPE(cmd) != ETRAXI2C_IOCTYPE) {
                 return -ENOTTY;
         }
@@ -665,9 +665,13 @@ i2c_ioctl(struct inode *inode, struct file *file,
                                  I2C_ARGREG(arg),
                                  I2C_ARGVALUE(arg)));
 
-                        return i2c_writereg(I2C_ARGSLAVE(arg),
+                        lock_kernel();
+                        ret = i2c_writereg(I2C_ARGSLAVE(arg),
                                             I2C_ARGREG(arg),
                                             I2C_ARGVALUE(arg));
+                        unlock_kernel();
+                        return ret;
+
                 case I2C_READREG:
                 {
                         unsigned char val;
@@ -675,7 +679,9 @@ i2c_ioctl(struct inode *inode, struct file *file,
                         D(printk("i2cr %d %d ",
                                 I2C_ARGSLAVE(arg),
                                 I2C_ARGREG(arg)));
+                        lock_kernel();
                         val = i2c_readreg(I2C_ARGSLAVE(arg), I2C_ARGREG(arg));
+                        unlock_kernel();
                         D(printk("= %d\n", val));
                         return val;
                 }
@@ -688,10 +694,10 @@ i2c_ioctl(struct inode *inode, struct file *file,
 }
 
 static const struct file_operations i2c_fops = {
-        .owner =    THIS_MODULE,
-        .ioctl =    i2c_ioctl,
-        .open =     i2c_open,
-        .release =  i2c_release,
+        .owner          = THIS_MODULE,
+        .unlocked_ioctl = i2c_ioctl,
+        .open           = i2c_open,
+        .release        = i2c_release,
 };
 
 static int __init i2c_init(void)
diff --git a/arch/cris/arch-v32/drivers/pcf8563.c b/arch/cris/arch-v32/drivers/pcf8563.c
index f4478506e52..bef6eb53b15 100644
--- a/arch/cris/arch-v32/drivers/pcf8563.c
+++ b/arch/cris/arch-v32/drivers/pcf8563.c
@@ -24,6 +24,7 @@
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/ioctl.h>
+#include <linux/smp_lock.h>
 #include <linux/delay.h>
 #include <linux/bcd.h>
 #include <linux/mutex.h>
@@ -49,7 +50,7 @@ static DEFINE_MUTEX(rtc_lock); /* Protect state etc */
 static const unsigned char days_in_month[] =
         { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
 
-int pcf8563_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
+static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 
 /* Cache VL bit value read at driver init since writing the RTC_SECOND
  * register clears the VL status.
@@ -57,8 +58,8 @@ int pcf8563_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
 static int voltage_low;
 
 static const struct file_operations pcf8563_fops = {
-        .owner =        THIS_MODULE,
-        .ioctl =        pcf8563_ioctl
+        .owner          = THIS_MODULE,
+        .unlocked_ioctl = pcf8563_unlocked_ioctl,
 };
 
 unsigned char
@@ -208,8 +209,7 @@ pcf8563_exit(void)
  * ioctl calls for this driver. Why return -ENOTTY upon error? Because
  * POSIX says so!
  */
-int pcf8563_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
-        unsigned long arg)
+static int pcf8563_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
         /* Some sanity checks. */
         if (_IOC_TYPE(cmd) != RTC_MAGIC)
@@ -335,6 +335,17 @@ int pcf8563_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
         return 0;
 }
 
+static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+        int ret;
+
+        lock_kernel();
+        return pcf8563_ioctl(filp, cmd, arg);
+        unlock_kernel();
+
+        return ret;
+}
+
 static int __init pcf8563_register(void)
 {
         if (pcf8563_init() < 0) {