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cris: autoconvert trivial BKL users 

All uses of the big kernel lock in the cris architecture
are for ioctl and open functions of character device drivers,
which can be trivially converted to a per-driver mutex.

Most of these are probably unnecessary, so it may make sense
to audit them and eventually remove the extra mutex introduced
by this patch.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: linux-cris-kernel@axis.com
This commit is contained in:
Arnd Bergmann 2010-09-11 18:18:22 +02:00
parent 80eb4a6f89
commit 0890b5880d
8 changed files with 36 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/cris/arch-v10/drivers/ds1302.c
View File

@ -19,7 +19,7 @@
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/bcd.h>
#include <linux/capability.h>
@ -34,6 +34,7 @@
#define RTC_MAJOR_NR 121 /* local major, change later */
static DEFINE_MUTEX(ds1302_mutex);
static const char ds1302_name[] = "ds1302";
/* The DS1302 might be connected to different bits on different products.
@ -357,9 +358,9 @@ static long rtc_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned lon
{
int ret;
lock_kernel();
mutex_lock(&ds1302_mutex);
ret = rtc_ioctl(file, cmd, arg);
unlock_kernel();
mutex_unlock(&ds1302_mutex);
return ret;
}

6
arch/cris/arch-v10/drivers/pcf8563.c
View File

@ -27,7 +27,6 @@
#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>
@ -49,6 +48,7 @@
#define rtc_read(x) i2c_readreg(RTC_I2C_READ, x)
#define rtc_write(x,y) i2c_writereg(RTC_I2C_WRITE, x, y)
static DEFINE_MUTEX(pcf8563_mutex);
static DEFINE_MUTEX(rtc_lock); /* Protect state etc */
static const unsigned char days_in_month[] =
@ -343,9 +343,9 @@ static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned
{
int ret;
lock_kernel();
mutex_lock(&pcf8563_mutex);
return pcf8563_ioctl(filp, cmd, arg);
unlock_kernel();
mutex_unlock(&pcf8563_mutex);
return ret;
}

11
arch/cris/arch-v10/drivers/sync_serial.c
View File

@ -20,7 +20,7 @@
#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/timer.h>
#include <asm/irq.h>
#include <asm/dma.h>
@ -149,6 +149,7 @@ struct sync_port {
};
static DEFINE_MUTEX(sync_serial_mutex);
static int etrax_sync_serial_init(void);
static void initialize_port(int portnbr);
static inline int sync_data_avail(struct sync_port *port);
@ -445,7 +446,7 @@ static int sync_serial_open(struct inode *inode, struct file *file)
int mode;
int err = -EBUSY;
lock_kernel();
mutex_lock(&sync_serial_mutex);
DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));
if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
@ -626,7 +627,7 @@ static int sync_serial_open(struct inode *inode, struct file *file)
ret = 0;
out:
unlock_kernel();
mutex_unlock(&sync_serial_mutex);
return ret;
}
@ -961,9 +962,9 @@ static long sync_serial_ioctl(struct file *file,
{
long ret;
lock_kernel();
mutex_lock(&sync_serial_mutex);
ret = sync_serial_ioctl_unlocked(file, cmd, arg);
unlock_kernel();
mutex_unlock(&sync_serial_mutex);
return ret;
}

4
arch/cris/arch-v32/drivers/cryptocop.c
View File

@ -3139,9 +3139,9 @@ cryptocop_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
struct inode *inode = file->f_path.dentry->d_inode;
long ret;
lock_kernel();
mutex_lock(&cryptocop_mutex);
ret = cryptocop_ioctl_unlocked(inode, filp, cmd, arg);
unlock_kernel();
mutex_unlock(&cryptocop_mutex);
return ret;
}

11
arch/cris/arch-v32/drivers/mach-a3/gpio.c
View File

@ -23,7 +23,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <asm/etraxgpio.h>
#include <hwregs/reg_map.h>
@ -66,6 +66,7 @@ static int dp_cnt;
#define DP(x)
#endif
static DEFINE_MUTEX(gpio_mutex);
static char gpio_name[] = "etrax gpio";
#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
@ -391,7 +392,7 @@ static int gpio_open(struct inode *inode, struct file *filp)
if (!priv)
return -ENOMEM;
lock_kernel();
mutex_lock(&gpio_mutex);
memset(priv, 0, sizeof(*priv));
priv->minor = p;
@ -414,7 +415,7 @@ static int gpio_open(struct inode *inode, struct file *filp)
spin_unlock_irq(&gpio_lock);
}
unlock_kernel();
mutex_unlock(&gpio_mutex);
return 0;
}
@ -667,9 +668,9 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret;
lock_kernel();
mutex_lock(&gpio_mutex);
ret = gpio_ioctl_unlocked(file, cmd, arg);
unlock_kernel();
mutex_unlock(&gpio_mutex);
return ret;
}

11
arch/cris/arch-v32/drivers/mach-fs/gpio.c
View File

@ -22,7 +22,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <asm/etraxgpio.h>
#include <hwregs/reg_map.h>
@ -64,6 +64,7 @@ static int dp_cnt;
#define DP(x)
#endif
static DEFINE_MUTEX(gpio_mutex);
static char gpio_name[] = "etrax gpio";
#if 0
@ -429,7 +430,7 @@ gpio_open(struct inode *inode, struct file *filp)
if (!priv)
return -ENOMEM;
lock_kernel();
mutex_lock(&gpio_mutex);
memset(priv, 0, sizeof(*priv));
priv->minor = p;
@ -450,7 +451,7 @@ gpio_open(struct inode *inode, struct file *filp)
alarmlist = priv;
spin_unlock_irq(&alarm_lock);
unlock_kernel();
mutex_unlock(&gpio_mutex);
return 0;
}
@ -708,9 +709,9 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret;
lock_kernel();
mutex_lock(&gpio_mutex);
ret = gpio_ioctl_unlocked(file, cmd, arg);
unlock_kernel();
mutex_unlock(&gpio_mutex);
return ret;
}

6
arch/cris/arch-v32/drivers/pcf8563.c
View File

@ -24,7 +24,6 @@
#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>
@ -45,6 +44,7 @@
#define rtc_read(x) i2c_readreg(RTC_I2C_READ, x)
#define rtc_write(x,y) i2c_writereg(RTC_I2C_WRITE, x, y)
static DEFINE_MUTEX(pcf8563_mutex);
static DEFINE_MUTEX(rtc_lock); /* Protect state etc */
static const unsigned char days_in_month[] =
@ -339,9 +339,9 @@ static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned
{
int ret;
lock_kernel();
mutex_lock(&pcf8563_mutex);
return pcf8563_ioctl(filp, cmd, arg);
unlock_kernel();
mutex_unlock(&pcf8563_mutex);
return ret;
}

11
arch/cris/arch-v32/drivers/sync_serial.c
View File

@ -13,7 +13,7 @@
#include <linux/errno.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/init.h>
@ -145,6 +145,7 @@ typedef struct sync_port
spinlock_t lock;
} sync_port;
static DEFINE_MUTEX(sync_serial_mutex);
static int etrax_sync_serial_init(void);
static void initialize_port(int portnbr);
static inline int sync_data_avail(struct sync_port *port);
@ -434,7 +435,7 @@ static int sync_serial_open(struct inode *inode, struct file *file)
reg_dma_rw_cfg cfg = {.en = regk_dma_yes};
reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes};
lock_kernel();
mutex_lock(&sync_serial_mutex);
DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));
if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
@ -583,7 +584,7 @@ static int sync_serial_open(struct inode *inode, struct file *file)
port->busy++;
ret = 0;
out:
unlock_kernel();
mutex_unlock(&sync_serial_mutex);
return ret;
}
@ -966,9 +967,9 @@ static long sync_serial_ioctl(struct file *file,
{
long ret;
lock_kernel();
mutex_lock(&sync_serial_mutex);
ret = sync_serial_ioctl_unlocked(file, cmd, arg);
unlock_kernel();
mutex_unlock(&sync_serial_mutex);
return ret;
}