diff --git a/drivers/power/ds2780_battery.c b/drivers/power/ds2780_battery.c index de31cae1ba5..74fad941c56 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 975684a40f1..5f92a4bb33f 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 a0c8965c1a7..530a2d30906 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 52ad812fa1e..773dca5beaf 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 8e813eed0f0..441ad3a3b58 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 7a7dbe5026f..40a10b5ed12 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 84e2410aec1..984b30331a4 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 0f7b8f9c509..85f2cdb27fa 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 5754c9a4f58..aa7bd5fa2fa 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 39f78c0b143..7b09307de0e 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 73737936502..a1fba79eb1b 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 0d0c7985293..877daf74159 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 82bc66497b4..557dfb0b4f6 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 ff29ae747ee..d90062b211f 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 bfb89864102..1a574370d2c 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 4d012ca3f32..45908e56c2f 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 68288355727..531434180af 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);