From a56aaf73b960c6735622a9f402d17d0c6b5a02ed Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Wed, 23 Dec 2015 15:45:36 +0000 Subject: ledtrig-netdev: switch rwlock to spinlock MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Read/write lock was adding useless complexity, there wasn't any real gain in case of this driver. Also switch to _bh variants to avoid deadlocks. Signed-off-by: Rafał Miłecki SVN-Revision: 47986 --- .../generic/files/drivers/leds/ledtrig-netdev.c | 40 +++++++++++----------- 1 file changed, 20 insertions(+), 20 deletions(-) (limited to 'target/linux/generic/files/drivers') diff --git a/target/linux/generic/files/drivers/leds/ledtrig-netdev.c b/target/linux/generic/files/drivers/leds/ledtrig-netdev.c index 5e9b95f5ee..018392a920 100644 --- a/target/linux/generic/files/drivers/leds/ledtrig-netdev.c +++ b/target/linux/generic/files/drivers/leds/ledtrig-netdev.c @@ -68,7 +68,7 @@ #define MODE_RX 4 struct led_netdev_data { - rwlock_t lock; + spinlock_t lock; struct timer_list timer; struct notifier_block notifier; @@ -102,9 +102,9 @@ static ssize_t led_device_name_show(struct device *dev, struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_netdev_data *trigger_data = led_cdev->trigger_data; - read_lock(&trigger_data->lock); + spin_lock_bh(&trigger_data->lock); sprintf(buf, "%s\n", trigger_data->device_name); - read_unlock(&trigger_data->lock); + spin_unlock_bh(&trigger_data->lock); return strlen(buf) + 1; } @@ -118,7 +118,7 @@ static ssize_t led_device_name_store(struct device *dev, if (size < 0 || size >= IFNAMSIZ) return -EINVAL; - write_lock(&trigger_data->lock); + spin_lock_bh(&trigger_data->lock); strcpy(trigger_data->device_name, buf); if (size > 0 && trigger_data->device_name[size-1] == '\n') @@ -132,7 +132,7 @@ static ssize_t led_device_name_store(struct device *dev, set_baseline_state(trigger_data); /* updates LEDs, may start timers */ } - write_unlock(&trigger_data->lock); + spin_unlock_bh(&trigger_data->lock); return size; } @@ -144,7 +144,7 @@ static ssize_t led_mode_show(struct device *dev, struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_netdev_data *trigger_data = led_cdev->trigger_data; - read_lock(&trigger_data->lock); + spin_lock_bh(&trigger_data->lock); if (trigger_data->mode == 0) { strcpy(buf, "none\n"); @@ -158,7 +158,7 @@ static ssize_t led_mode_show(struct device *dev, strcat(buf, "\n"); } - read_unlock(&trigger_data->lock); + spin_unlock_bh(&trigger_data->lock); return strlen(buf)+1; } @@ -199,10 +199,10 @@ static ssize_t led_mode_store(struct device *dev, if (new_mode == -1) return -EINVAL; - write_lock(&trigger_data->lock); + spin_lock_bh(&trigger_data->lock); trigger_data->mode = new_mode; set_baseline_state(trigger_data); - write_unlock(&trigger_data->lock); + spin_unlock_bh(&trigger_data->lock); return size; } @@ -215,9 +215,9 @@ static ssize_t led_interval_show(struct device *dev, struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_netdev_data *trigger_data = led_cdev->trigger_data; - read_lock(&trigger_data->lock); + spin_lock_bh(&trigger_data->lock); sprintf(buf, "%u\n", jiffies_to_msecs(trigger_data->interval)); - read_unlock(&trigger_data->lock); + spin_unlock_bh(&trigger_data->lock); return strlen(buf) + 1; } @@ -237,10 +237,10 @@ static ssize_t led_interval_store(struct device *dev, /* impose some basic bounds on the timer interval */ if (count == size && value >= 5 && value <= 10000) { - write_lock(&trigger_data->lock); + spin_lock_bh(&trigger_data->lock); trigger_data->interval = msecs_to_jiffies(value); set_baseline_state(trigger_data); /* resets timer */ - write_unlock(&trigger_data->lock); + spin_unlock_bh(&trigger_data->lock); ret = count; } @@ -259,7 +259,7 @@ static int netdev_trig_notify(struct notifier_block *nb, if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER) return NOTIFY_DONE; - write_lock(&trigger_data->lock); + spin_lock_bh(&trigger_data->lock); if (strcmp(dev->name, trigger_data->device_name)) goto done; @@ -285,7 +285,7 @@ static int netdev_trig_notify(struct notifier_block *nb, set_baseline_state(trigger_data); done: - write_unlock(&trigger_data->lock); + spin_unlock_bh(&trigger_data->lock); return NOTIFY_DONE; } @@ -297,7 +297,7 @@ static void netdev_trig_timer(unsigned long arg) unsigned new_activity; struct rtnl_link_stats64 temp; - write_lock(&trigger_data->lock); + spin_lock(&trigger_data->lock); if (!trigger_data->link_up || !trigger_data->net_dev || (trigger_data->mode & (MODE_TX | MODE_RX)) == 0) { /* we don't need to do timer work, just reflect link state. */ @@ -336,7 +336,7 @@ static void netdev_trig_timer(unsigned long arg) mod_timer(&trigger_data->timer, jiffies + trigger_data->interval); no_restart: - write_unlock(&trigger_data->lock); + spin_unlock(&trigger_data->lock); } static void netdev_trig_activate(struct led_classdev *led_cdev) @@ -348,7 +348,7 @@ static void netdev_trig_activate(struct led_classdev *led_cdev) if (!trigger_data) return; - rwlock_init(&trigger_data->lock); + spin_lock_init(&trigger_data->lock); trigger_data->notifier.notifier_call = netdev_trig_notify; trigger_data->notifier.priority = 10; @@ -399,14 +399,14 @@ static void netdev_trig_deactivate(struct led_classdev *led_cdev) device_remove_file(led_cdev->dev, &dev_attr_mode); device_remove_file(led_cdev->dev, &dev_attr_interval); - write_lock(&trigger_data->lock); + spin_lock_bh(&trigger_data->lock); if (trigger_data->net_dev) { dev_put(trigger_data->net_dev); trigger_data->net_dev = NULL; } - write_unlock(&trigger_data->lock); + spin_unlock_bh(&trigger_data->lock); del_timer_sync(&trigger_data->timer); -- cgit v1.2.3