pcmcia: assert locking to struct pcmcia_device
Dominik Brodowski [Sun, 17 Jan 2010 17:31:34 +0000 (18:31 +0100)]
Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

Documentation/pcmcia/locking.txt
drivers/pcmcia/ds.c
drivers/pcmcia/pcmcia_resource.c

index 5f25de4..d625105 100644 (file)
@@ -90,3 +90,28 @@ or single-use fields not mentioned):
        struct list_head        devices_list;
        u8                      device_count;
        struct                  pcmcia_state;
+
+
+3. Per PCMCIA-device Data:
+--------------------------
+
+The "main" struct pcmcia_devie is protected as follows (read-only fields
+or single-use fields not mentioned):
+
+
+- by pcmcia_socket->ops_mutex:
+       struct list_head        socket_device_list;
+       struct config_t         *function_config;
+       u16                     _irq:1;
+       u16                     _io:1;
+       u16                     _win:4;
+       u16                     _locked:1;
+       u16                     allow_func_id_match:1;
+       u16                     suspended:1;
+       u16                     _removed:1;
+
+- by the PCMCIA driver:
+       io_req_t                io;
+       irq_req_t               irq;
+       config_req_t            conf;
+       window_handle_t         win;
index 4c40db8..83b51dd 100644 (file)
@@ -835,6 +835,8 @@ static inline int pcmcia_devmatch(struct pcmcia_device *dev,
        }
 
        if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID) {
+               int ret;
+
                if ((!dev->has_func_id) || (dev->func_id != did->func_id))
                        return 0;
 
@@ -849,10 +851,15 @@ static inline int pcmcia_devmatch(struct pcmcia_device *dev,
                 * after it has re-checked that there is no possible module
                 * with a prod_id/manf_id/card_id match.
                 */
-               dev_dbg(&dev->dev,
-                       "skipping FUNC_ID match until userspace interaction\n");
-               if (!dev->allow_func_id_match)
+               mutex_lock(&dev->socket->ops_mutex);
+               ret = dev->allow_func_id_match;
+               mutex_unlock(&dev->socket->ops_mutex);
+
+               if (!ret) {
+                       dev_dbg(&dev->dev,
+                               "skipping FUNC_ID match until userspace ACK\n");
                        return 0;
+               }
        }
 
        if (did->match_flags & PCMCIA_DEV_ID_MATCH_FAKE_CIS) {
@@ -1079,9 +1086,9 @@ static ssize_t pcmcia_store_allow_func_id_match(struct device *dev,
        if (!count)
                return -EINVAL;
 
-       mutex_lock(&p_dev->socket->skt_mutex);
+       mutex_lock(&p_dev->socket->ops_mutex);
        p_dev->allow_func_id_match = 1;
-       mutex_unlock(&p_dev->socket->skt_mutex);
+       mutex_unlock(&p_dev->socket->ops_mutex);
 
        ret = bus_rescan_devices(&pcmcia_bus_type);
        if (ret)
@@ -1114,8 +1121,13 @@ static int pcmcia_dev_suspend(struct device *dev, pm_message_t state)
        struct pcmcia_driver *p_drv = NULL;
        int ret = 0;
 
-       if (p_dev->suspended)
+       mutex_lock(&p_dev->socket->ops_mutex);
+       if (p_dev->suspended) {
+               mutex_unlock(&p_dev->socket->ops_mutex);
                return 0;
+       }
+       p_dev->suspended = 1;
+       mutex_unlock(&p_dev->socket->ops_mutex);
 
        dev_dbg(dev, "suspending\n");
 
@@ -1132,6 +1144,9 @@ static int pcmcia_dev_suspend(struct device *dev, pm_message_t state)
                                   "pcmcia: device %s (driver %s) did "
                                   "not want to go to sleep (%d)\n",
                                   p_dev->devname, p_drv->drv.name, ret);
+                       mutex_lock(&p_dev->socket->ops_mutex);
+                       p_dev->suspended = 0;
+                       mutex_unlock(&p_dev->socket->ops_mutex);
                        goto out;
                }
        }
@@ -1142,8 +1157,6 @@ static int pcmcia_dev_suspend(struct device *dev, pm_message_t state)
        }
 
  out:
-       if (!ret)
-               p_dev->suspended = 1;
        return ret;
 }
 
@@ -1154,8 +1167,13 @@ static int pcmcia_dev_resume(struct device *dev)
        struct pcmcia_driver *p_drv = NULL;
        int ret = 0;
 
-       if (!p_dev->suspended)
+       mutex_lock(&p_dev->socket->ops_mutex);
+       if (!p_dev->suspended) {
+               mutex_unlock(&p_dev->socket->ops_mutex);
                return 0;
+       }
+       p_dev->suspended = 0;
+       mutex_unlock(&p_dev->socket->ops_mutex);
 
        dev_dbg(dev, "resuming\n");
 
@@ -1176,8 +1194,6 @@ static int pcmcia_dev_resume(struct device *dev)
                ret = p_drv->resume(p_dev);
 
  out:
-       if (!ret)
-               p_dev->suspended = 0;
        return ret;
 }
 
index f0de7b8..b2df041 100644 (file)
@@ -191,14 +191,18 @@ int pcmcia_access_configuration_register(struct pcmcia_device *p_dev,
                return -EINVAL;
 
        s = p_dev->socket;
+
+       mutex_lock(&s->ops_mutex);
        c = p_dev->function_config;
 
        if (!(c->state & CONFIG_LOCKED)) {
                dev_dbg(&s->dev, "Configuration isnt't locked\n");
+               mutex_unlock(&s->ops_mutex);
                return -EACCES;
        }
 
        addr = (c->ConfigBase + reg->Offset) >> 1;
+       mutex_unlock(&s->ops_mutex);
 
        switch (reg->Action) {
        case CS_READ:
@@ -254,19 +258,22 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
        config_t *c;
 
        s = p_dev->socket;
+
+       mutex_lock(&s->ops_mutex);
        c = p_dev->function_config;
 
        if (!(s->state & SOCKET_PRESENT)) {
                dev_dbg(&s->dev, "No card present\n");
+               mutex_unlock(&s->ops_mutex);
                return -ENODEV;
        }
        if (!(c->state & CONFIG_LOCKED)) {
                dev_dbg(&s->dev, "Configuration isnt't locked\n");
+               mutex_unlock(&s->ops_mutex);
                return -EACCES;
        }
 
        if (mod->Attributes & CONF_IRQ_CHANGE_VALID) {
-               mutex_lock(&s->ops_mutex);
                if (mod->Attributes & CONF_ENABLE_IRQ) {
                        c->Attributes |= CONF_ENABLE_IRQ;
                        s->socket.io_irq = s->irq.AssignedIRQ;
@@ -275,7 +282,6 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
                        s->socket.io_irq = 0;
                }
                s->ops->set_socket(s, &s->socket);
-               mutex_unlock(&s->ops_mutex);
        }
 
        if (mod->Attributes & CONF_VCC_CHANGE_VALID) {
@@ -288,9 +294,9 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
            (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
                if (mod->Vpp1 != mod->Vpp2) {
                        dev_dbg(&s->dev, "Vpp1 and Vpp2 must be the same\n");
+                       mutex_unlock(&s->ops_mutex);
                        return -EINVAL;
                }
-               mutex_lock(&s->ops_mutex);
                s->socket.Vpp = mod->Vpp1;
                if (s->ops->set_socket(s, &s->socket)) {
                        mutex_unlock(&s->ops_mutex);
@@ -298,10 +304,10 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
                                   "Unable to set VPP\n");
                        return -EIO;
                }
-               mutex_unlock(&s->ops_mutex);
        } else if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) ||
                   (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
                dev_dbg(&s->dev, "changing Vcc is not allowed at this time\n");
+               mutex_unlock(&s->ops_mutex);
                return -EINVAL;
        }
 
@@ -311,7 +317,6 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
                int i;
 
                io_on.speed = io_speed;
-               mutex_lock(&s->ops_mutex);
                for (i = 0; i < MAX_IO_WIN; i++) {
                        if (!s->io[i].res)
                                continue;
@@ -326,8 +331,8 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
                        mdelay(40);
                        s->ops->set_io_map(s, &io_on);
                }
-               mutex_unlock(&s->ops_mutex);
        }
+       mutex_unlock(&s->ops_mutex);
 
        return 0;
 } /* modify_configuration */
@@ -338,10 +343,11 @@ int pcmcia_release_configuration(struct pcmcia_device *p_dev)
 {
        pccard_io_map io = { 0, 0, 0, 0, 1 };
        struct pcmcia_socket *s = p_dev->socket;
-       config_t *c = p_dev->function_config;
+       config_t *c;
        int i;
 
        mutex_lock(&s->ops_mutex);
+       c = p_dev->function_config;
        if (p_dev->_locked) {
                p_dev->_locked = 0;
                if (--(s->lock_count) == 0) {
@@ -381,10 +387,14 @@ int pcmcia_release_configuration(struct pcmcia_device *p_dev)
 static int pcmcia_release_io(struct pcmcia_device *p_dev, io_req_t *req)
 {
        struct pcmcia_socket *s = p_dev->socket;
-       config_t *c = p_dev->function_config;
+       int ret = -EINVAL;
+       config_t *c;
+
+       mutex_lock(&s->ops_mutex);
+       c = p_dev->function_config;
 
        if (!p_dev->_io)
-               return -EINVAL;
+               goto out;
 
        p_dev->_io = 0;
 
@@ -392,7 +402,7 @@ static int pcmcia_release_io(struct pcmcia_device *p_dev, io_req_t *req)
            (c->io.NumPorts1 != req->NumPorts1) ||
            (c->io.BasePort2 != req->BasePort2) ||
            (c->io.NumPorts2 != req->NumPorts2))
-               return -EINVAL;
+               goto out;
 
        c->state &= ~CONFIG_IO_REQ;
 
@@ -400,30 +410,38 @@ static int pcmcia_release_io(struct pcmcia_device *p_dev, io_req_t *req)
        if (req->NumPorts2)
                release_io_space(s, req->BasePort2, req->NumPorts2);
 
-       return 0;
+out:
+       mutex_unlock(&s->ops_mutex);
+
+       return ret;
 } /* pcmcia_release_io */
 
 
 static int pcmcia_release_irq(struct pcmcia_device *p_dev, irq_req_t *req)
 {
        struct pcmcia_socket *s = p_dev->socket;
-       config_t *c = p_dev->function_config;
+       config_t *c;
+       int ret = -EINVAL;
+
+       mutex_lock(&s->ops_mutex);
+
+       c = p_dev->function_config;
 
        if (!p_dev->_irq)
-               return -EINVAL;
+               goto out;
+
        p_dev->_irq = 0;
 
        if (c->state & CONFIG_LOCKED)
-               return -EACCES;
+               goto out;
+
        if (c->irq.Attributes != req->Attributes) {
                dev_dbg(&s->dev, "IRQ attributes must match assigned ones\n");
-               return -EINVAL;
+               goto out;
        }
-       mutex_lock(&s->ops_mutex);
        if (s->irq.AssignedIRQ != req->AssignedIRQ) {
-               mutex_unlock(&s->ops_mutex);
                dev_dbg(&s->dev, "IRQ must match assigned one\n");
-               return -EINVAL;
+               goto out;
        }
        if (--s->irq.Config == 0) {
                c->state &= ~CONFIG_IRQ_REQ;
@@ -436,9 +454,12 @@ static int pcmcia_release_irq(struct pcmcia_device *p_dev, irq_req_t *req)
 #ifdef CONFIG_PCMCIA_PROBE
        pcmcia_used_irq[req->AssignedIRQ]--;
 #endif
+       ret = 0;
+
+out:
        mutex_unlock(&s->ops_mutex);
 
-       return 0;
+       return ret;
 } /* pcmcia_release_irq */
 
 
@@ -495,13 +516,15 @@ int pcmcia_request_configuration(struct pcmcia_device *p_dev,
                dev_dbg(&s->dev, "IntType may not be INT_CARDBUS\n");
                return -EINVAL;
        }
+
+       mutex_lock(&s->ops_mutex);
        c = p_dev->function_config;
        if (c->state & CONFIG_LOCKED) {
+               mutex_unlock(&s->ops_mutex);
                dev_dbg(&s->dev, "Configuration is locked\n");
                return -EACCES;
        }
 
-       mutex_lock(&s->ops_mutex);
        /* Do power control.  We don't allow changes in Vcc. */
        s->socket.Vpp = req->Vpp;
        if (s->ops->set_socket(s, &s->socket)) {
@@ -615,58 +638,65 @@ int pcmcia_request_io(struct pcmcia_device *p_dev, io_req_t *req)
 {
        struct pcmcia_socket *s = p_dev->socket;
        config_t *c;
+       int ret = -EINVAL;
+
+       mutex_lock(&s->ops_mutex);
 
        if (!(s->state & SOCKET_PRESENT)) {
                dev_dbg(&s->dev, "No card present\n");
-               return -ENODEV;
+               goto out;
        }
 
        if (!req)
-               return -EINVAL;
+               goto out;
+
        c = p_dev->function_config;
        if (c->state & CONFIG_LOCKED) {
                dev_dbg(&s->dev, "Configuration is locked\n");
-               return -EACCES;
+               goto out;
        }
        if (c->state & CONFIG_IO_REQ) {
                dev_dbg(&s->dev, "IO already configured\n");
-               return -EBUSY;
+               goto out;
        }
        if (req->Attributes1 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS)) {
                dev_dbg(&s->dev, "bad attribute setting for IO region 1\n");
-               return -EINVAL;
+               goto out;
        }
        if ((req->NumPorts2 > 0) &&
            (req->Attributes2 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS))) {
                dev_dbg(&s->dev, "bad attribute setting for IO region 2\n");
-               return -EINVAL;
+               goto out;
        }
 
-       mutex_lock(&s->ops_mutex);
        dev_dbg(&s->dev, "trying to allocate resource 1\n");
-       if (alloc_io_space(s, req->Attributes1, &req->BasePort1,
-                          req->NumPorts1, req->IOAddrLines)) {
+       ret = alloc_io_space(s, req->Attributes1, &req->BasePort1,
+                            req->NumPorts1, req->IOAddrLines);
+       if (ret) {
                dev_dbg(&s->dev, "allocation of resource 1 failed\n");
-               mutex_unlock(&s->ops_mutex);
-               return -EBUSY;
+               goto out;
        }
 
        if (req->NumPorts2) {
                dev_dbg(&s->dev, "trying to allocate resource 2\n");
-               if (alloc_io_space(s, req->Attributes2, &req->BasePort2,
-                                  req->NumPorts2, req->IOAddrLines)) {
+               ret = alloc_io_space(s, req->Attributes2, &req->BasePort2,
+                                    req->NumPorts2, req->IOAddrLines);
+               if (ret) {
                        dev_dbg(&s->dev, "allocation of resource 2 failed\n");
                        release_io_space(s, req->BasePort1, req->NumPorts1);
-                       mutex_unlock(&s->ops_mutex);
-                       return -EBUSY;
+                       goto out;
                }
        }
-       mutex_unlock(&s->ops_mutex);
 
        c->io = *req;
        c->state |= CONFIG_IO_REQ;
        p_dev->_io = 1;
-       return 0;
+       dev_dbg(&s->dev, "allocating resources succeeded: %d\n", ret);
+
+out:
+       mutex_unlock(&s->ops_mutex);
+
+       return ret;
 } /* pcmcia_request_io */
 EXPORT_SYMBOL(pcmcia_request_io);
 
@@ -695,21 +725,22 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
        int ret = -EINVAL, irq = 0;
        int type;
 
+       mutex_lock(&s->ops_mutex);
+
        if (!(s->state & SOCKET_PRESENT)) {
                dev_dbg(&s->dev, "No card present\n");
-               return -ENODEV;
+               goto out;
        }
        c = p_dev->function_config;
        if (c->state & CONFIG_LOCKED) {
                dev_dbg(&s->dev, "Configuration is locked\n");
-               return -EACCES;
+               goto out;
        }
        if (c->state & CONFIG_IRQ_REQ) {
                dev_dbg(&s->dev, "IRQ already configured\n");
-               return -EBUSY;
+               goto out;
        }
 
-       mutex_lock(&s->ops_mutex);
        /* Decide what type of interrupt we are registering */
        type = 0;
        if (s->functions > 1)           /* All of this ought to be handled higher up */
@@ -768,7 +799,7 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
        if (ret && !s->irq.AssignedIRQ) {
                if (!s->pci_irq) {
                        dev_printk(KERN_INFO, &s->dev, "no IRQ found\n");
-                       return ret;
+                       goto out;
                }
                type = IRQF_SHARED;
                irq = s->pci_irq;
@@ -780,7 +811,7 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
                if (ret) {
                        dev_printk(KERN_INFO, &s->dev,
                                "request_irq() failed\n");
-                       return ret;
+                       goto out;
                }
        }
 
@@ -803,9 +834,10 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
        pcmcia_used_irq[irq]++;
 #endif
 
+       ret = 0;
+out:
        mutex_unlock(&s->ops_mutex);
-
-       return 0;
+       return ret;
 } /* pcmcia_request_irq */
 EXPORT_SYMBOL(pcmcia_request_irq);