pcmcia: use pccardd to handle eject, insert, suspend and resume requests

This avoids any sysfs-related deadlock (or lockdep warning), such
as reported at http://lkml.org/lkml/2010/1/17/88 .

Reported-by: Ming Lei <tom.leiming@gmail.com>
Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 58 insertions, 119 deletions

diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index 7ba45b0cca6..823ecda3221 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -505,7 +505,10 @@ static int socket_insert(struct pcmcia_socket *skt)
 	dev_dbg(&skt->dev, "insert\n");
 
 	mutex_lock(&skt->ops_mutex);
-	WARN_ON(skt->state & SOCKET_INUSE);
+	if (skt->state & SOCKET_INUSE) {
+		mutex_unlock(&skt->ops_mutex);
+		return -EINVAL;
+	}
 	skt->state |= SOCKET_INUSE;
 
 	ret = socket_setup(skt, setup_delay);
@@ -682,16 +685,19 @@ static int pccardd(void *__skt)
 	for (;;) {
 		unsigned long flags;
 		unsigned int events;
+		unsigned int sysfs_events;
 
 		set_current_state(TASK_INTERRUPTIBLE);
 
 		spin_lock_irqsave(&skt->thread_lock, flags);
 		events = skt->thread_events;
 		skt->thread_events = 0;
+		sysfs_events = skt->sysfs_events;
+		skt->sysfs_events = 0;
 		spin_unlock_irqrestore(&skt->thread_lock, flags);
 
+		mutex_lock(&skt->skt_mutex);
 		if (events) {
-			mutex_lock(&skt->skt_mutex);
 			if (events & SS_DETECT)
 				socket_detect_change(skt);
 			if (events & SS_BATDEAD)
@@ -700,10 +706,34 @@ static int pccardd(void *__skt)
 				send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 			if (events & SS_READY)
 				send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
-			mutex_unlock(&skt->skt_mutex);
-			continue;
 		}
 
+		if (sysfs_events) {
+			if (sysfs_events & PCMCIA_UEVENT_EJECT)
+				socket_remove(skt);
+			if (sysfs_events & PCMCIA_UEVENT_INSERT)
+				socket_insert(skt);
+			if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
+				!(skt->state & SOCKET_CARDBUS)) {
+				ret = socket_resume(skt);
+				if (!ret && skt->callback)
+					skt->callback->resume(skt);
+			}
+			if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
+				!(skt->state & SOCKET_CARDBUS)) {
+				if (skt->callback)
+					ret = skt->callback->suspend(skt);
+				else
+					ret = 0;
+				if (!ret)
+					socket_suspend(skt);
+			}
+		}
+		mutex_unlock(&skt->skt_mutex);
+
+		if (events || sysfs_events)
+			continue;
+
 		if (kthread_should_stop())
 			break;
 
@@ -745,6 +775,30 @@ void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 } /* pcmcia_parse_events */
 EXPORT_SYMBOL(pcmcia_parse_events);
 
+/**
+ * pcmcia_parse_uevents() - tell pccardd to issue manual commands
+ * @s:		the PCMCIA socket we wan't to command
+ * @events:	events to pass to pccardd
+ *
+ * userspace-issued insert, eject, suspend and resume commands must be
+ * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
+ * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
+ * PCMCIA_UEVENT_RESUME (for resume) and PCMCIA_UEVENT_SUSPEND (for suspend).
+ */
+void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
+{
+	unsigned long flags;
+	dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
+	if (s->thread) {
+		spin_lock_irqsave(&s->thread_lock, flags);
+		s->sysfs_events |= events;
+		spin_unlock_irqrestore(&s->thread_lock, flags);
+
+		wake_up_process(s->thread);
+	}
+}
+EXPORT_SYMBOL(pcmcia_parse_uevents);
+
 
 /* register pcmcia_callback */
 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
@@ -828,121 +882,6 @@ int pcmcia_reset_card(struct pcmcia_socket *skt)
 EXPORT_SYMBOL(pcmcia_reset_card);
 
 
-/* These shut down or wake up a socket.  They are sort of user
- * initiated versions of the APM suspend and resume actions.
- */
-int pcmcia_suspend_card(struct pcmcia_socket *skt)
-{
-	int ret;
-
-	dev_dbg(&skt->dev, "suspending socket\n");
-
-	mutex_lock(&skt->skt_mutex);
-	do {
-		if (!(skt->state & SOCKET_PRESENT)) {
-			ret = -ENODEV;
-			break;
-		}
-		if (skt->state & SOCKET_CARDBUS) {
-			ret = -EPERM;
-			break;
-		}
-		if (skt->callback) {
-			ret = skt->callback->suspend(skt);
-			if (ret)
-				break;
-		}
-		ret = socket_suspend(skt);
-	} while (0);
-	mutex_unlock(&skt->skt_mutex);
-
-	return ret;
-} /* suspend_card */
-EXPORT_SYMBOL(pcmcia_suspend_card);
-
-
-int pcmcia_resume_card(struct pcmcia_socket *skt)
-{
-	int ret;
-
-	dev_dbg(&skt->dev, "waking up socket\n");
-
-	mutex_lock(&skt->skt_mutex);
-	do {
-		if (!(skt->state & SOCKET_PRESENT)) {
-			ret = -ENODEV;
-			break;
-		}
-		if (skt->state & SOCKET_CARDBUS) {
-			ret = -EPERM;
-			break;
-		}
-		ret = socket_resume(skt);
-		if (!ret && skt->callback)
-			skt->callback->resume(skt);
-	} while (0);
-	mutex_unlock(&skt->skt_mutex);
-
-	return ret;
-} /* resume_card */
-EXPORT_SYMBOL(pcmcia_resume_card);
-
-
-/* These handle user requests to eject or insert a card. */
-int pcmcia_eject_card(struct pcmcia_socket *skt)
-{
-	int ret;
-
-	dev_dbg(&skt->dev, "user eject request\n");
-
-	mutex_lock(&skt->skt_mutex);
-	do {
-		if (!(skt->state & SOCKET_PRESENT)) {
-			ret = -ENODEV;
-			break;
-		}
-
-		ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
-		if (ret != 0) {
-			ret = -EINVAL;
-			break;
-		}
-
-		socket_remove(skt);
-		ret = 0;
-	} while (0);
-	mutex_unlock(&skt->skt_mutex);
-
-	return ret;
-} /* eject_card */
-EXPORT_SYMBOL(pcmcia_eject_card);
-
-
-int pcmcia_insert_card(struct pcmcia_socket *skt)
-{
-	int ret;
-
-	dev_dbg(&skt->dev, "user insert request\n");
-
-	mutex_lock(&skt->skt_mutex);
-	do {
-		if (skt->state & SOCKET_PRESENT) {
-			ret = -EBUSY;
-			break;
-		}
-		if (socket_insert(skt) == -ENODEV) {
-			ret = -ENODEV;
-			break;
-		}
-		ret = 0;
-	} while (0);
-	mutex_unlock(&skt->skt_mutex);
-
-	return ret;
-} /* insert_card */
-EXPORT_SYMBOL(pcmcia_insert_card);
-
-
 static int pcmcia_socket_uevent(struct device *dev,
 				struct kobj_uevent_env *env)
 {