pcmcia: add locking to struct pcmcia_socket->pcmcia_state()

Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index bcb9ef1..0eb242c 100644 (file)
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -649,10 +649,17 @@ static void pcmcia_delayed_add_device(struct work_struct *work)
 {
        struct pcmcia_socket *s =
                container_of(work, struct pcmcia_socket, device_add);
-       dev_dbg(&s->dev, "adding additional device to %d\n", s->sock);
-       pcmcia_device_add(s, s->pcmcia_state.mfc_pfc);
+       u8 mfc_pfc;
+       unsigned long flags;
+
+       spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
+       mfc_pfc = s->pcmcia_state.mfc_pfc;
        s->pcmcia_state.device_add_pending = 0;
        s->pcmcia_state.mfc_pfc = 0;
+       spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+
+       dev_dbg(&s->dev, "adding additional device to %d\n", s->sock);
+       pcmcia_device_add(s, mfc_pfc);
 }
 
 static int pcmcia_requery(struct device *dev, void * _data)
@@ -761,8 +768,13 @@ static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
 
                if (old_funcs > no_funcs)
                        pcmcia_card_remove(s, dev);
-               else if (no_funcs > old_funcs)
+               else if (no_funcs > old_funcs) {
+                       unsigned long flags;
+
+                       spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
                        pcmcia_add_device_later(s, 1);
+                       spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+               }
        }
  release:
        release_firmware(fw);
@@ -1236,6 +1248,7 @@ static int pcmcia_bus_suspend(struct pcmcia_socket *skt)
 static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
 {
        struct pcmcia_socket *s = pcmcia_get_socket(skt);
+       unsigned long flags;
 
        if (!s) {
                dev_printk(KERN_ERR, &skt->dev,
@@ -1249,7 +1262,9 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
 
        switch (event) {
        case CS_EVENT_CARD_REMOVAL:
+               spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
                s->pcmcia_state.present = 0;
+               spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
                pcmcia_card_remove(skt, NULL);
                handle_event(skt, event);
                mutex_lock(&s->ops_mutex);
@@ -1258,7 +1273,9 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
                break;
 
        case CS_EVENT_CARD_INSERTION:
+               spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
                s->pcmcia_state.present = 1;
+               spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
                mutex_lock(&s->ops_mutex);
                destroy_cis_cache(s); /* to be on the safe side... */
                mutex_unlock(&s->ops_mutex);
@@ -1304,14 +1321,19 @@ struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev)
 {
        struct pcmcia_device *p_dev;
        struct pcmcia_device *ret = NULL;
+       unsigned long flags;
 
        p_dev = pcmcia_get_dev(_p_dev);
        if (!p_dev)
                return NULL;
 
+       spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
        if (!p_dev->socket->pcmcia_state.present)
                goto out;
 
+       if (p_dev->socket->pcmcia_state.dead)
+               goto out;
+
        if (p_dev->_removed)
                goto out;
 
@@ -1320,6 +1342,7 @@ struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev)
 
        ret = p_dev;
  out:
+       spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
        pcmcia_put_dev(p_dev);
        return ret;
 }
@@ -1383,11 +1406,15 @@ static void pcmcia_bus_remove_socket(struct device *dev,
                                     struct class_interface *class_intf)
 {
        struct pcmcia_socket *socket = dev_get_drvdata(dev);
+       unsigned long flags;
 
        if (!socket)
                return;
 
+       spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
        socket->pcmcia_state.dead = 1;
+       spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+
        pccard_register_pcmcia(socket, NULL);
 
        /* unregister any unbound devices */