[PATCH 36/49] pcmcia: assert locking to struct pcmcia_device
Dominik Brodowski
linux at dominikbrodowski.net
Sat Feb 27 05:42:31 EST 2010
Tested-by: Wolfram Sang <w.sang at pengutronix.de>
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
---
Documentation/pcmcia/locking.txt | 25 ++++++++
drivers/pcmcia/ds.c | 38 ++++++++----
drivers/pcmcia/pcmcia_resource.c | 122 ++++++++++++++++++++++++--------------
3 files changed, 129 insertions(+), 56 deletions(-)
diff --git a/Documentation/pcmcia/locking.txt b/Documentation/pcmcia/locking.txt
index 5f25de4..d625105 100644
--- a/Documentation/pcmcia/locking.txt
+++ b/Documentation/pcmcia/locking.txt
@@ -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;
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 4c40db8..83b51dd 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -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;
}
diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index f0de7b8..b2df041 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -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);
--
1.6.3.3
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