Merge branch 'perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux...

[pandora-kernel.git] / drivers / pcmcia / ds.c

diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index cb6036d..041eee4 100644 (file)
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -335,7 +335,6 @@ static void pcmcia_card_remove(struct pcmcia_socket *s, struct pcmcia_device *le
 
                mutex_lock(&s->ops_mutex);
                list_del(&p_dev->socket_device_list);
-               p_dev->_removed = 1;
                mutex_unlock(&s->ops_mutex);
 
                dev_dbg(&p_dev->dev, "unregistering device\n");
@@ -654,14 +653,7 @@ static int pcmcia_requery_callback(struct device *dev, void * _data)
 
 static void pcmcia_requery(struct pcmcia_socket *s)
 {
-       int present, has_pfc;
-
-       mutex_lock(&s->ops_mutex);
-       present = s->pcmcia_state.present;
-       mutex_unlock(&s->ops_mutex);
-
-       if (!present)
-               return;
+       int has_pfc;
 
        if (s->functions == 0) {
                pcmcia_card_add(s);
@@ -687,12 +679,10 @@ static void pcmcia_requery(struct pcmcia_socket *s)
                        new_funcs = mfc.nfn;
                else
                        new_funcs = 1;
-               if (old_funcs > new_funcs) {
+               if (old_funcs != new_funcs) {
+                       /* we need to re-start */
                        pcmcia_card_remove(s, NULL);
                        pcmcia_card_add(s);
-               } else if (new_funcs > old_funcs) {
-                       s->functions = new_funcs;
-                       pcmcia_device_add(s, 1);
                }
        }
 
@@ -728,6 +718,8 @@ static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
        struct pcmcia_socket *s = dev->socket;
        const struct firmware *fw;
        int ret = -ENOMEM;
+       cistpl_longlink_mfc_t mfc;
+       int old_funcs, new_funcs = 1;
 
        if (!filename)
                return -EINVAL;
@@ -750,6 +742,14 @@ static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
                        goto release;
                }
 
+               /* we need to re-start if the number of functions changed */
+               old_funcs = s->functions;
+               if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC,
+                                       &mfc))
+                       new_funcs = mfc.nfn;
+
+               if (old_funcs != new_funcs)
+                       ret = -EBUSY;
 
                /* update information */
                pcmcia_device_query(dev);
@@ -820,11 +820,12 @@ static inline int pcmcia_devmatch(struct pcmcia_device *dev,
        }
 
        if (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) {
-               if (dev->device_no != did->device_no)
-                       return 0;
+               dev_dbg(&dev->dev, "this is a pseudo-multi-function device\n");
                mutex_lock(&dev->socket->ops_mutex);
                dev->socket->pcmcia_state.has_pfc = 1;
                mutex_unlock(&dev->socket->ops_mutex);
+               if (dev->device_no != did->device_no)
+                       return 0;
        }
 
        if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID) {
@@ -835,7 +836,7 @@ static inline int pcmcia_devmatch(struct pcmcia_device *dev,
 
                /* if this is a pseudo-multi-function device,
                 * we need explicit matches */
-               if (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO)
+               if (dev->socket->pcmcia_state.has_pfc)
                        return 0;
                if (dev->device_no)
                        return 0;
@@ -858,10 +859,8 @@ static inline int pcmcia_devmatch(struct pcmcia_device *dev,
        if (did->match_flags & PCMCIA_DEV_ID_MATCH_FAKE_CIS) {
                dev_dbg(&dev->dev, "device needs a fake CIS\n");
                if (!dev->socket->fake_cis)
-                       pcmcia_load_firmware(dev, did->cisfile);
-
-               if (!dev->socket->fake_cis)
-                       return 0;
+                       if (pcmcia_load_firmware(dev, did->cisfile))
+                               return 0;
        }
 
        if (did->match_flags & PCMCIA_DEV_ID_MATCH_ANONYMOUS) {
@@ -1254,9 +1253,7 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
 
        switch (event) {
        case CS_EVENT_CARD_REMOVAL:
-               mutex_lock(&s->ops_mutex);
-               s->pcmcia_state.present = 0;
-               mutex_unlock(&s->ops_mutex);
+               atomic_set(&skt->present, 0);
                pcmcia_card_remove(skt, NULL);
                handle_event(skt, event);
                mutex_lock(&s->ops_mutex);
@@ -1265,9 +1262,9 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
                break;
 
        case CS_EVENT_CARD_INSERTION:
+               atomic_set(&skt->present, 1);
                mutex_lock(&s->ops_mutex);
                s->pcmcia_state.has_pfc = 0;
-               s->pcmcia_state.present = 1;
                destroy_cis_cache(s); /* to be on the safe side... */
                mutex_unlock(&s->ops_mutex);
                pcmcia_card_add(skt);
@@ -1286,6 +1283,7 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
                        destroy_cis_cache(skt);
                        kfree(skt->fake_cis);
                        skt->fake_cis = NULL;
+                       s->functions = 0;
                        mutex_unlock(&s->ops_mutex);
                        /* now, add the new card */
                        ds_event(skt, CS_EVENT_CARD_INSERTION,
@@ -1307,7 +1305,13 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
     return 0;
 } /* ds_event */
 
-
+/*
+ * NOTE: This is racy. There's no guarantee the card will still be
+ * physically present, even if the call to this function returns
+ * non-NULL. Furthermore, the device driver most likely is unbound
+ * almost immediately, so the timeframe where pcmcia_dev_present
+ * returns NULL is probably really really small.
+ */
 struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev)
 {
        struct pcmcia_device *p_dev;
@@ -1317,22 +1321,9 @@ struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev)
        if (!p_dev)
                return NULL;
 
-       mutex_lock(&p_dev->socket->ops_mutex);
-       if (!p_dev->socket->pcmcia_state.present)
-               goto out;
-
-       if (p_dev->socket->pcmcia_state.dead)
-               goto out;
-
-       if (p_dev->_removed)
-               goto out;
-
-       if (p_dev->suspended)
-               goto out;
+       if (atomic_read(&p_dev->socket->present) != 0)
+               ret = p_dev;
 
-       ret = p_dev;
- out:
-       mutex_unlock(&p_dev->socket->ops_mutex);
        pcmcia_put_dev(p_dev);
        return ret;
 }
@@ -1382,6 +1373,8 @@ static int __devinit pcmcia_bus_add_socket(struct device *dev,
                return ret;
        }
 
+       atomic_set(&socket->present, 0);
+
        return 0;
 }
 
@@ -1393,10 +1386,6 @@ static void pcmcia_bus_remove_socket(struct device *dev,
        if (!socket)
                return;
 
-       mutex_lock(&socket->ops_mutex);
-       socket->pcmcia_state.dead = 1;
-       mutex_unlock(&socket->ops_mutex);
-
        pccard_register_pcmcia(socket, NULL);
 
        /* unregister any unbound devices */