From 59b015133cd0034f5904a76969d73476380aac46 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 5 Jan 2010 17:56:02 -0800 Subject: Input: serio - fix potential deadlock when unbinding drivers sysfs_remove_group() waits for sysfs attributes to be removed, therefore we do not need to worry about driver-specific attributes being accessed after driver has been detached from the device. In fact, attempts to take serio->drv_mutex in attribute methods may lead to the following deadlock: sysfs_read_file() fill_read_buffer() sysfs_get_active_two() psmouse_attr_show_helper() serio_pin_driver() serio_disconnect_driver() mutex_lock(&serio->drv_mutex); <--------> mutex_lock(&serio_drv_mutex); psmouse_disconnect() sysfs_remove_group(... psmouse_attr_group); .... sysfs_deactivate(); wait_for_completion(); Fix this by removing calls to serio_[un]pin_driver() and functions themselves and using driver-private mutexes to serialize access to attribute's set() methods that may change device state. Signed-off-by: Eric W. Biederman Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/atkbd.c | 59 ++++++++++++++++++------------------------ 1 file changed, 25 insertions(+), 34 deletions(-) (limited to 'drivers/input/keyboard/atkbd.c') diff --git a/drivers/input/keyboard/atkbd.c b/drivers/input/keyboard/atkbd.c index 1f5e2ce..1cf32a7 100644 --- a/drivers/input/keyboard/atkbd.c +++ b/drivers/input/keyboard/atkbd.c @@ -225,8 +225,10 @@ struct atkbd { struct delayed_work event_work; unsigned long event_jiffies; - struct mutex event_mutex; unsigned long event_mask; + + /* Serializes reconnect(), attr->set() and event work */ + struct mutex mutex; }; /* @@ -577,7 +579,7 @@ static void atkbd_event_work(struct work_struct *work) { struct atkbd *atkbd = container_of(work, struct atkbd, event_work.work); - mutex_lock(&atkbd->event_mutex); + mutex_lock(&atkbd->mutex); if (!atkbd->enabled) { /* @@ -596,7 +598,7 @@ static void atkbd_event_work(struct work_struct *work) atkbd_set_repeat_rate(atkbd); } - mutex_unlock(&atkbd->event_mutex); + mutex_unlock(&atkbd->mutex); } /* @@ -612,7 +614,7 @@ static void atkbd_schedule_event_work(struct atkbd *atkbd, int event_bit) atkbd->event_jiffies = jiffies; set_bit(event_bit, &atkbd->event_mask); - wmb(); + mb(); schedule_delayed_work(&atkbd->event_work, delay); } @@ -849,12 +851,13 @@ static void atkbd_disconnect(struct serio *serio) { struct atkbd *atkbd = serio_get_drvdata(serio); + sysfs_remove_group(&serio->dev.kobj, &atkbd_attribute_group); + atkbd_disable(atkbd); /* make sure we don't have a command in flight */ cancel_delayed_work_sync(&atkbd->event_work); - sysfs_remove_group(&serio->dev.kobj, &atkbd_attribute_group); input_unregister_device(atkbd->dev); serio_close(serio); serio_set_drvdata(serio, NULL); @@ -1087,7 +1090,7 @@ static int atkbd_connect(struct serio *serio, struct serio_driver *drv) atkbd->dev = dev; ps2_init(&atkbd->ps2dev, serio); INIT_DELAYED_WORK(&atkbd->event_work, atkbd_event_work); - mutex_init(&atkbd->event_mutex); + mutex_init(&atkbd->mutex); switch (serio->id.type) { @@ -1160,19 +1163,23 @@ static int atkbd_reconnect(struct serio *serio) { struct atkbd *atkbd = serio_get_drvdata(serio); struct serio_driver *drv = serio->drv; + int retval = -1; if (!atkbd || !drv) { printk(KERN_DEBUG "atkbd: reconnect request, but serio is disconnected, ignoring...\n"); return -1; } + mutex_lock(&atkbd->mutex); + atkbd_disable(atkbd); if (atkbd->write) { if (atkbd_probe(atkbd)) - return -1; + goto out; + if (atkbd->set != atkbd_select_set(atkbd, atkbd->set, atkbd->extra)) - return -1; + goto out; atkbd_activate(atkbd); @@ -1190,8 +1197,11 @@ static int atkbd_reconnect(struct serio *serio) } atkbd_enable(atkbd); + retval = 0; - return 0; + out: + mutex_unlock(&atkbd->mutex); + return retval; } static struct serio_device_id atkbd_serio_ids[] = { @@ -1235,47 +1245,28 @@ static ssize_t atkbd_attr_show_helper(struct device *dev, char *buf, ssize_t (*handler)(struct atkbd *, char *)) { struct serio *serio = to_serio_port(dev); - int retval; - - retval = serio_pin_driver(serio); - if (retval) - return retval; - - if (serio->drv != &atkbd_drv) { - retval = -ENODEV; - goto out; - } - - retval = handler((struct atkbd *)serio_get_drvdata(serio), buf); + struct atkbd *atkbd = serio_get_drvdata(serio); -out: - serio_unpin_driver(serio); - return retval; + return handler(atkbd, buf); } static ssize_t atkbd_attr_set_helper(struct device *dev, const char *buf, size_t count, ssize_t (*handler)(struct atkbd *, const char *, size_t)) { struct serio *serio = to_serio_port(dev); - struct atkbd *atkbd; + struct atkbd *atkbd = serio_get_drvdata(serio); int retval; - retval = serio_pin_driver(serio); + retval = mutex_lock_interruptible(&atkbd->mutex); if (retval) return retval; - if (serio->drv != &atkbd_drv) { - retval = -ENODEV; - goto out; - } - - atkbd = serio_get_drvdata(serio); atkbd_disable(atkbd); retval = handler(atkbd, buf, count); atkbd_enable(atkbd); -out: - serio_unpin_driver(serio); + mutex_unlock(&atkbd->mutex); + return retval; } -- cgit v1.1