W1: split master mutex to avoid deadlocks.

The 'mutex' in struct w1_master is use for two very different
purposes.

Firstly it protects various data structures such as the list of all
slaves.

Secondly it protects the w1 buss against concurrent accesses.

This can lead to deadlocks when the ->probe code called while adding a
slave needs to talk on the bus, as is the case for power_supply
devices.
ds2780 and ds2781 drivers contain a work around to track which
process hold the lock simply to avoid this deadlock.  bq27000 doesn't
have that work around and so deadlocks.

There are other possible deadlocks involving sysfs.
When removing a device the sysfs s_active lock is held, so the lock
that protects the slave list must take precedence over s_active.
However when access power_supply attributes via sysfs, the s_active
lock must take precedence over the lock that protects accesses to
the bus.

So to avoid deadlocks between w1 slaves and sysfs, these must be
two separate locks.  Making them separate means that the work around
in ds2780 and ds2781 can be removed.

So this patch:
 - adds a new mutex: "bus_mutex" which serialises access to the bus.
 - takes in mutex in w1_search and ds1wm_search while they access
   the bus for searching.  The mutex is dropped before calling the
   callback which adds the slave.
 - changes all slaves to use bus_mutex instead of mutex to
   protect access to the bus
 - removes w1_ds2790_io_nolock and w1_ds2781_io_nolock, and the
   related code from drivers/power/ds278[01]_battery.c which
   calls them.

Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

17 files changed, 57 insertions, 95 deletions

diff --git a/drivers/power/ds2780_battery.c b/drivers/power/ds2780_battery.c
index de31cae1ba53..74fad941c56c 100644
--- a/drivers/power/ds2780_battery.c
+++ b/drivers/power/ds2780_battery.c
@@ -39,7 +39,6 @@ struct ds2780_device_info {
 	struct device *dev;
 	struct power_supply bat;
 	struct device *w1_dev;
-	struct task_struct *mutex_holder;
 };
 
 enum current_types {
@@ -64,10 +63,7 @@ static inline struct power_supply *to_power_supply(struct device *dev)
 static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
 	char *buf, int addr, size_t count, int io)
 {
-	if (dev_info->mutex_holder == current)
-		return w1_ds2780_io_nolock(dev_info->w1_dev, buf, addr, count, io);
-	else
-		return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
+	return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
 }
 
 static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val,
@@ -779,7 +775,6 @@ static int __devinit ds2780_battery_probe(struct platform_device *pdev)
 	dev_info->bat.properties	= ds2780_battery_props;
 	dev_info->bat.num_properties	= ARRAY_SIZE(ds2780_battery_props);
 	dev_info->bat.get_property	= ds2780_battery_get_property;
-	dev_info->mutex_holder		= current;
 
 	ret = power_supply_register(&pdev->dev, &dev_info->bat);
 	if (ret) {
@@ -809,8 +804,6 @@ static int __devinit ds2780_battery_probe(struct platform_device *pdev)
 		goto fail_remove_bin_file;
 	}
 
-	dev_info->mutex_holder = NULL;
-
 	return 0;
 
 fail_remove_bin_file:
@@ -830,8 +823,6 @@ static int __devexit ds2780_battery_remove(struct platform_device *pdev)
 {
 	struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
 
-	dev_info->mutex_holder = current;
-
 	/* remove attributes */
 	sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 
diff --git a/drivers/power/ds2781_battery.c b/drivers/power/ds2781_battery.c
index 975684a40f15..5f92a4bb33f9 100644
--- a/drivers/power/ds2781_battery.c
+++ b/drivers/power/ds2781_battery.c
@@ -37,7 +37,6 @@ struct ds2781_device_info {
 	struct device *dev;
 	struct power_supply bat;
 	struct device *w1_dev;
-	struct task_struct *mutex_holder;
 };
 
 enum current_types {
@@ -62,11 +61,7 @@ static inline struct power_supply *to_power_supply(struct device *dev)
 static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
 	char *buf, int addr, size_t count, int io)
 {
-	if (dev_info->mutex_holder == current)
-		return w1_ds2781_io_nolock(dev_info->w1_dev, buf, addr,
-				count, io);
-	else
-		return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
+	return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
 }
 
 int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,
@@ -775,7 +770,6 @@ static int __devinit ds2781_battery_probe(struct platform_device *pdev)
 	dev_info->bat.properties	= ds2781_battery_props;
 	dev_info->bat.num_properties	= ARRAY_SIZE(ds2781_battery_props);
 	dev_info->bat.get_property	= ds2781_battery_get_property;
-	dev_info->mutex_holder		= current;
 
 	ret = power_supply_register(&pdev->dev, &dev_info->bat);
 	if (ret) {
@@ -805,8 +799,6 @@ static int __devinit ds2781_battery_probe(struct platform_device *pdev)
 		goto fail_remove_bin_file;
 	}
 
-	dev_info->mutex_holder = NULL;
-
 	return 0;
 
 fail_remove_bin_file:
@@ -826,8 +818,6 @@ static int __devexit ds2781_battery_remove(struct platform_device *pdev)
 {
 	struct ds2781_device_info *dev_info = platform_get_drvdata(pdev);
 
-	dev_info->mutex_holder = current;
-
 	/* remove attributes */
 	sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
 
diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c
index a0c8965c1a79..530a2d309063 100644
--- a/drivers/w1/masters/ds1wm.c
+++ b/drivers/w1/masters/ds1wm.c
@@ -334,7 +334,9 @@ static void ds1wm_search(void *data, struct w1_master *master_dev,
 			return;
 		}
 
+		mutex_lock(&master_dev->bus_mutex);
 		if (ds1wm_reset(ds1wm_data)) {
+			mutex_unlock(&master_dev->bus_mutex);
 			dev_dbg(&ds1wm_data->pdev->dev,
 				"pass: %d reset error (or no slaves)\n", pass);
 			break;
@@ -387,6 +389,7 @@ static void ds1wm_search(void *data, struct w1_master *master_dev,
 
 		}
 		if (ds1wm_data->read_error) {
+			mutex_unlock(&master_dev->bus_mutex);
 			dev_err(&ds1wm_data->pdev->dev,
 				"pass: %d read error, retrying\n", pass);
 			break;
@@ -400,6 +403,7 @@ static void ds1wm_search(void *data, struct w1_master *master_dev,
 		dev_dbg(&ds1wm_data->pdev->dev,
 			"pass: %d resetting bus\n", pass);
 		ds1wm_reset(ds1wm_data);
+		mutex_unlock(&master_dev->bus_mutex);
 		if ((r_prime & ((u64)1 << 63)) && (d & ((u64)1 << 63))) {
 			dev_err(&ds1wm_data->pdev->dev,
 				"pass: %d bus error, retrying\n", pass);
diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c
index 52ad812fa1e7..773dca5beafe 100644
--- a/drivers/w1/slaves/w1_bq27000.c
+++ b/drivers/w1/slaves/w1_bq27000.c
@@ -31,10 +31,10 @@ static int w1_bq27000_read(struct device *dev, unsigned int reg)
 	u8 val;
 	struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev);
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 	w1_write_8(sl->master, HDQ_CMD_READ | reg);
 	val = w1_read_8(sl->master);
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 
 	return val;
 }
diff --git a/drivers/w1/slaves/w1_ds2408.c b/drivers/w1/slaves/w1_ds2408.c
index 8e813eed0f0a..441ad3a3b586 100644
--- a/drivers/w1/slaves/w1_ds2408.c
+++ b/drivers/w1/slaves/w1_ds2408.c
@@ -52,11 +52,11 @@ static int _read_reg(struct w1_slave *sl, u8 address, unsigned char* buf)
 	if (!buf)
 		return -EINVAL;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 	dev_dbg(&sl->dev, "mutex locked");
 
 	if (w1_reset_select_slave(sl)) {
-		mutex_unlock(&sl->master->mutex);
+		mutex_unlock(&sl->master->bus_mutex);
 		return -EIO;
 	}
 
@@ -66,7 +66,7 @@ static int _read_reg(struct w1_slave *sl, u8 address, unsigned char* buf)
 	w1_write_block(sl->master, wrbuf, 3);
 	*buf = w1_read_8(sl->master);
 
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 	dev_dbg(&sl->dev, "mutex unlocked");
 	return 1;
 }
@@ -165,7 +165,7 @@ static ssize_t w1_f29_write_output(
 		return -EFAULT;
 
 	dev_dbg(&sl->dev, "locking mutex for write_output");
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 	dev_dbg(&sl->dev, "mutex locked");
 
 	if (w1_reset_select_slave(sl))
@@ -200,14 +200,14 @@ static ssize_t w1_f29_write_output(
 		/* read the result of the READ_PIO_REGS command */
 		if (w1_read_8(sl->master) == *buf) {
 			/* success! */
-			mutex_unlock(&sl->master->mutex);
+			mutex_unlock(&sl->master->bus_mutex);
 			dev_dbg(&sl->dev,
 				"mutex unlocked, retries:%d", retries);
 			return 1;
 		}
 	}
 error:
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 	dev_dbg(&sl->dev, "mutex unlocked in error, retries:%d", retries);
 
 	return -EIO;
@@ -228,7 +228,7 @@ static ssize_t w1_f29_write_activity(
 	if (count != 1 || off != 0)
 		return -EFAULT;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	if (w1_reset_select_slave(sl))
 		goto error;
@@ -236,7 +236,7 @@ static ssize_t w1_f29_write_activity(
 	while (retries--) {
 		w1_write_8(sl->master, W1_F29_FUNC_RESET_ACTIVITY_LATCHES);
 		if (w1_read_8(sl->master) == W1_F29_SUCCESS_CONFIRM_BYTE) {
-			mutex_unlock(&sl->master->mutex);
+			mutex_unlock(&sl->master->bus_mutex);
 			return 1;
 		}
 		if (w1_reset_resume_command(sl->master))
@@ -244,7 +244,7 @@ static ssize_t w1_f29_write_activity(
 	}
 
 error:
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 	return -EIO;
 }
 
@@ -263,7 +263,7 @@ static ssize_t w1_f29_write_status_control(
 	if (count != 1 || off != 0)
 		return -EFAULT;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	if (w1_reset_select_slave(sl))
 		goto error;
@@ -285,12 +285,12 @@ static ssize_t w1_f29_write_status_control(
 		w1_write_block(sl->master, w1_buf, 3);
 		if (w1_read_8(sl->master) == *buf) {
 			/* success! */
-			mutex_unlock(&sl->master->mutex);
+			mutex_unlock(&sl->master->bus_mutex);
 			return 1;
 		}
 	}
 error:
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 
 	return -EIO;
 }
diff --git a/drivers/w1/slaves/w1_ds2423.c b/drivers/w1/slaves/w1_ds2423.c
index 7a7dbe5026f1..40a10b5ed120 100644
--- a/drivers/w1/slaves/w1_ds2423.c
+++ b/drivers/w1/slaves/w1_ds2423.c
@@ -66,7 +66,7 @@ static ssize_t w1_counter_read(struct device *device,
 	wrbuf[0]	= 0xA5;
 	wrbuf[1]	= rom_addr & 0xFF;
 	wrbuf[2]	= rom_addr >> 8;
-	mutex_lock(&dev->mutex);
+	mutex_lock(&dev->bus_mutex);
 	if (!w1_reset_select_slave(sl)) {
 		w1_write_block(dev, wrbuf, 3);
 		read_byte_count = 0;
@@ -124,7 +124,7 @@ static ssize_t w1_counter_read(struct device *device,
 	} else {
 		c -= snprintf(out_buf + PAGE_SIZE - c, c, "Connection error");
 	}
-	mutex_unlock(&dev->mutex);
+	mutex_unlock(&dev->bus_mutex);
 	return PAGE_SIZE - c;
 }
 
diff --git a/drivers/w1/slaves/w1_ds2431.c b/drivers/w1/slaves/w1_ds2431.c
index 84e2410aec1d..984b30331a45 100644
--- a/drivers/w1/slaves/w1_ds2431.c
+++ b/drivers/w1/slaves/w1_ds2431.c
@@ -107,7 +107,7 @@ static ssize_t w1_f2d_read_bin(struct file *filp, struct kobject *kobj,
 	if (count == 0)
 		return 0;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	/* read directly from the EEPROM in chunks of W1_F2D_READ_MAXLEN */
 	while (todo > 0) {
@@ -126,7 +126,7 @@ static ssize_t w1_f2d_read_bin(struct file *filp, struct kobject *kobj,
 		off += W1_F2D_READ_MAXLEN;
 	}
 
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 
 	return count;
 }
@@ -214,7 +214,7 @@ static ssize_t w1_f2d_write_bin(struct file *filp, struct kobject *kobj,
 	if (count == 0)
 		return 0;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	/* Can only write data in blocks of the size of the scratchpad */
 	addr = off;
@@ -259,7 +259,7 @@ static ssize_t w1_f2d_write_bin(struct file *filp, struct kobject *kobj,
 	}
 
 out_up:
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 
 	return count;
 }
diff --git a/drivers/w1/slaves/w1_ds2433.c b/drivers/w1/slaves/w1_ds2433.c
index 0f7b8f9c509a..85f2cdb27fa2 100644
--- a/drivers/w1/slaves/w1_ds2433.c
+++ b/drivers/w1/slaves/w1_ds2433.c
@@ -107,7 +107,7 @@ static ssize_t w1_f23_read_bin(struct file *filp, struct kobject *kobj,
 	if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
 		return 0;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 #ifdef CONFIG_W1_SLAVE_DS2433_CRC
 
@@ -138,7 +138,7 @@ static ssize_t w1_f23_read_bin(struct file *filp, struct kobject *kobj,
 #endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
 
 out_up:
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 
 	return count;
 }
@@ -233,7 +233,7 @@ static ssize_t w1_f23_write_bin(struct file *filp, struct kobject *kobj,
 	}
 #endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	/* Can only write data to one page at a time */
 	idx = 0;
@@ -251,7 +251,7 @@ static ssize_t w1_f23_write_bin(struct file *filp, struct kobject *kobj,
 	}
 
 out_up:
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 
 	return count;
 }
diff --git a/drivers/w1/slaves/w1_ds2760.c b/drivers/w1/slaves/w1_ds2760.c
index 5754c9a4f58b..aa7bd5fa2fa8 100644
--- a/drivers/w1/slaves/w1_ds2760.c
+++ b/drivers/w1/slaves/w1_ds2760.c
@@ -31,7 +31,7 @@ static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,
 	if (!dev)
 		return 0;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	if (addr > DS2760_DATA_SIZE || addr < 0) {
 		count = 0;
@@ -54,7 +54,7 @@ static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,
 	}
 
 out:
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 
 	return count;
 }
@@ -76,14 +76,14 @@ static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd)
 	if (!dev)
 		return -EINVAL;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	if (w1_reset_select_slave(sl) == 0) {
 		w1_write_8(sl->master, cmd);
 		w1_write_8(sl->master, addr);
 	}
 
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 	return 0;
 }
 
diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c
index 39f78c0b143c..7b09307de0ef 100644
--- a/drivers/w1/slaves/w1_ds2780.c
+++ b/drivers/w1/slaves/w1_ds2780.c
@@ -60,30 +60,16 @@ int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
 	if (!dev)
 		return -ENODEV;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	ret = w1_ds2780_do_io(dev, buf, addr, count, io);
 
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 
 	return ret;
 }
 EXPORT_SYMBOL(w1_ds2780_io);
 
-int w1_ds2780_io_nolock(struct device *dev, char *buf, int addr, size_t count,
-			int io)
-{
-	int ret;
-
-	if (!dev)
-		return -ENODEV;
-
-	ret = w1_ds2780_do_io(dev, buf, addr, count, io);
-
-	return ret;
-}
-EXPORT_SYMBOL(w1_ds2780_io_nolock);
-
 int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
 {
 	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
@@ -91,14 +77,14 @@ int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
 	if (!dev)
 		return -EINVAL;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	if (w1_reset_select_slave(sl) == 0) {
 		w1_write_8(sl->master, cmd);
 		w1_write_8(sl->master, addr);
 	}
 
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 	return 0;
 }
 EXPORT_SYMBOL(w1_ds2780_eeprom_cmd);
diff --git a/drivers/w1/slaves/w1_ds2780.h b/drivers/w1/slaves/w1_ds2780.h
index 737379365021..a1fba79eb1b5 100644
--- a/drivers/w1/slaves/w1_ds2780.h
+++ b/drivers/w1/slaves/w1_ds2780.h
@@ -124,8 +124,6 @@
 
 extern int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
 			int io);
-extern int w1_ds2780_io_nolock(struct device *dev, char *buf, int addr,
-			size_t count, int io);
 extern int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd);
 
 #endif /* !_W1_DS2780_H */
diff --git a/drivers/w1/slaves/w1_ds2781.c b/drivers/w1/slaves/w1_ds2781.c
index 0d0c7985293f..877daf74159c 100644
--- a/drivers/w1/slaves/w1_ds2781.c
+++ b/drivers/w1/slaves/w1_ds2781.c
@@ -58,30 +58,16 @@ int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count,
 	if (!dev)
 		return -ENODEV;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	ret = w1_ds2781_do_io(dev, buf, addr, count, io);
 
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 
 	return ret;
 }
 EXPORT_SYMBOL(w1_ds2781_io);
 
-int w1_ds2781_io_nolock(struct device *dev, char *buf, int addr, size_t count,
-			int io)
-{
-	int ret;
-
-	if (!dev)
-		return -ENODEV;
-
-	ret = w1_ds2781_do_io(dev, buf, addr, count, io);
-
-	return ret;
-}
-EXPORT_SYMBOL(w1_ds2781_io_nolock);
-
 int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd)
 {
 	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
@@ -89,14 +75,14 @@ int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd)
 	if (!dev)
 		return -EINVAL;
 
-	mutex_lock(&sl->master->mutex);
+	mutex_lock(&sl->master->bus_mutex);
 
 	if (w1_reset_select_slave(sl) == 0) {
 		w1_write_8(sl->master, cmd);
 		w1_write_8(sl->master, addr);
 	}
 
-	mutex_unlock(&sl->master->mutex);
+	mutex_unlock(&sl->master->bus_mutex);
 	return 0;
 }
 EXPORT_SYMBOL(w1_ds2781_eeprom_cmd);
diff --git a/drivers/w1/slaves/w1_ds2781.h b/drivers/w1/slaves/w1_ds2781.h
index 82bc66497b43..557dfb0b4f64 100644
--- a/drivers/w1/slaves/w1_ds2781.h
+++ b/drivers/w1/slaves/w1_ds2781.h
@@ -129,8 +129,6 @@
 
 extern int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count,
 			int io);
-extern int w1_ds2781_io_nolock(struct device *dev, char *buf, int addr,
-			size_t count, int io);
 extern int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd);
 
 #endif /* !_W1_DS2781_H */
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index ff29ae747ee8..d90062b211f8 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -179,7 +179,7 @@ static ssize_t w1_therm_read(struct device *device,
 	int i, max_trying = 10;
 	ssize_t c = PAGE_SIZE;
 
-	i = mutex_lock_interruptible(&dev->mutex);
+	i = mutex_lock_interruptible(&dev->bus_mutex);
 	if (i != 0)
 		return i;
 
@@ -207,19 +207,19 @@ static ssize_t w1_therm_read(struct device *device,
 			w1_write_8(dev, W1_CONVERT_TEMP);
 
 			if (external_power) {
-				mutex_unlock(&dev->mutex);
+				mutex_unlock(&dev->bus_mutex);
 
 				sleep_rem = msleep_interruptible(tm);
 				if (sleep_rem != 0)
 					return -EINTR;
 
-				i = mutex_lock_interruptible(&dev->mutex);
+				i = mutex_lock_interruptible(&dev->bus_mutex);
 				if (i != 0)
 					return i;
 			} else if (!w1_strong_pullup) {
 				sleep_rem = msleep_interruptible(tm);
 				if (sleep_rem != 0) {
-					mutex_unlock(&dev->mutex);
+					mutex_unlock(&dev->bus_mutex);
 					return -EINTR;
 				}
 			}
@@ -258,7 +258,7 @@ static ssize_t w1_therm_read(struct device *device,
 
 	c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n",
 		w1_convert_temp(rom, sl->family->fid));
-	mutex_unlock(&dev->mutex);
+	mutex_unlock(&dev->bus_mutex);
 
 	return PAGE_SIZE - c;
 }
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index bfb898641029..1a574370d2cd 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -885,16 +885,21 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb
 		 *
 		 * Return 0 - device(s) present, 1 - no devices present.
 		 */
+		mutex_lock(&dev->bus_mutex);
 		if (w1_reset_bus(dev)) {
+			mutex_unlock(&dev->bus_mutex);
 			dev_dbg(&dev->dev, "No devices present on the wire.\n");
 			break;
 		}
 
 		/* Do fast search on single slave bus */
 		if (dev->max_slave_count == 1) {
+			int rv;
 			w1_write_8(dev, W1_READ_ROM);
+			rv = w1_read_block(dev, (u8 *)&rn, 8);
+			mutex_unlock(&dev->bus_mutex);
 
-			if (w1_read_block(dev, (u8 *)&rn, 8) == 8 && rn)
+			if (rv == 8 && rn)
 				cb(dev, rn);
 
 			break;
@@ -927,10 +932,12 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb
 			rn |= (tmp64 << i);
 
 			if (kthread_should_stop()) {
+				mutex_unlock(&dev->bus_mutex);
 				dev_dbg(&dev->dev, "Abort w1_search\n");
 				return;
 			}
 		}
+		mutex_unlock(&dev->bus_mutex);
 
 		if ( (triplet_ret & 0x03) != 0x03 ) {
 			if ( (desc_bit == last_zero) || (last_zero < 0))
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index 4d012ca3f32c..45908e56c2f8 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -180,6 +180,7 @@ struct w1_master
 
 	struct task_struct	*thread;
 	struct mutex		mutex;
+	struct mutex		bus_mutex;
 
 	struct device_driver	*driver;
 	struct device		dev;
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index 68288355727a..531434180afd 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -76,6 +76,7 @@ static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
 
 	INIT_LIST_HEAD(&dev->slist);
 	mutex_init(&dev->mutex);
+	mutex_init(&dev->bus_mutex);
 
 	memcpy(&dev->dev, device, sizeof(struct device));
 	dev_set_name(&dev->dev, "w1_bus_master%u", dev->id);