[PATCH 38/49] pcmcia: use ops_mutex for rsrc_{mgr,nonstatic} locking
Dominik Brodowski
linux at dominikbrodowski.net
Sat Feb 27 05:42:33 EST 2010
Tested-by: Wolfram Sang <w.sang at pengutronix.de>
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
---
Documentation/pcmcia/locking.txt | 5 +++--
drivers/pcmcia/cs.c | 7 ++++++-
drivers/pcmcia/ds.c | 6 +++++-
drivers/pcmcia/pcmcia_ioctl.c | 4 +---
drivers/pcmcia/rsrc_mgr.c | 2 --
drivers/pcmcia/rsrc_nonstatic.c | 35 ++++++++---------------------------
6 files changed, 23 insertions(+), 36 deletions(-)
diff --git a/Documentation/pcmcia/locking.txt b/Documentation/pcmcia/locking.txt
index d625105..68f622b 100644
--- a/Documentation/pcmcia/locking.txt
+++ b/Documentation/pcmcia/locking.txt
@@ -36,7 +36,8 @@ be called with "ops_mutex" held:
socket_reset()
socket_setup()
- struct pccard_operations *ops
+ struct pccard_operations *ops
+ struct pccard_resource_ops *resource_ops;
Note that send_event() and struct pcmcia_callback *callback must not be
called with "ops_mutex" held.
@@ -54,7 +55,7 @@ protected by pcmcia_socket_list_rwsem;
2. Per-Socket Data:
-------------------
-The resource_ops are on their own to provide proper locking.
+The resource_ops and their data are protected by ops_mutex.
The "main" struct pcmcia_socket is protected as follows (read-only fields
or single-use fields not mentioned):
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index 13277ee..7ba45b0 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -224,7 +224,9 @@ int pcmcia_register_socket(struct pcmcia_socket *socket)
spin_lock_init(&socket->thread_lock);
if (socket->resource_ops->init) {
+ mutex_lock(&socket->ops_mutex);
ret = socket->resource_ops->init(socket);
+ mutex_unlock(&socket->ops_mutex);
if (ret)
goto err;
}
@@ -282,8 +284,11 @@ void pcmcia_unregister_socket(struct pcmcia_socket *socket)
up_write(&pcmcia_socket_list_rwsem);
/* wait for sysfs to drop all references */
- if (socket->resource_ops->exit)
+ if (socket->resource_ops->exit) {
+ mutex_lock(&socket->ops_mutex);
socket->resource_ops->exit(socket);
+ mutex_unlock(&socket->ops_mutex);
+ }
wait_for_completion(&socket->socket_released);
} /* pcmcia_unregister_socket */
EXPORT_SYMBOL(pcmcia_unregister_socket);
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 253d9ac..76a2163 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -607,19 +607,23 @@ static int pcmcia_card_add(struct pcmcia_socket *s)
{
cistpl_longlink_mfc_t mfc;
unsigned int no_funcs, i, no_chains;
- int ret = 0;
+ int ret = -EAGAIN;
+ mutex_lock(&s->ops_mutex);
if (!(s->resource_setup_done)) {
dev_dbg(&s->dev,
"no resources available, delaying card_add\n");
+ mutex_unlock(&s->ops_mutex);
return -EAGAIN; /* try again, but later... */
}
if (pcmcia_validate_mem(s)) {
dev_dbg(&s->dev, "validating mem resources failed, "
"delaying card_add\n");
+ mutex_unlock(&s->ops_mutex);
return -EAGAIN; /* try again, but later... */
}
+ mutex_unlock(&s->ops_mutex);
ret = pccard_validate_cis(s, &no_chains);
if (ret || !no_chains) {
diff --git a/drivers/pcmcia/pcmcia_ioctl.c b/drivers/pcmcia/pcmcia_ioctl.c
index db2e3db..96fd236 100644
--- a/drivers/pcmcia/pcmcia_ioctl.c
+++ b/drivers/pcmcia/pcmcia_ioctl.c
@@ -187,7 +187,6 @@ static int pcmcia_adjust_resource_info(adjust_t *adj)
continue;
} else if (!(s->resource_setup_old))
s->resource_setup_old = 1;
- mutex_unlock(&s->ops_mutex);
switch (adj->Resource) {
case RES_MEMORY_RANGE:
@@ -206,10 +205,9 @@ static int pcmcia_adjust_resource_info(adjust_t *adj)
* last call to adjust_resource_info, we
* always need to assume this is the latest
* one... */
- mutex_lock(&s->ops_mutex);
s->resource_setup_done = 1;
- mutex_unlock(&s->ops_mutex);
}
+ mutex_unlock(&s->ops_mutex);
}
}
up_read(&pcmcia_socket_list_rwsem);
diff --git a/drivers/pcmcia/rsrc_mgr.c b/drivers/pcmcia/rsrc_mgr.c
index b815866..aca2cfd 100644
--- a/drivers/pcmcia/rsrc_mgr.c
+++ b/drivers/pcmcia/rsrc_mgr.c
@@ -26,9 +26,7 @@ static int static_init(struct pcmcia_socket *s)
/* the good thing about SS_CAP_STATIC_MAP sockets is
* that they don't need a resource database */
- mutex_lock(&s->ops_mutex);
s->resource_setup_done = 1;
- mutex_unlock(&s->ops_mutex);
return 0;
}
diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 1de46cf..c13424f 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -59,7 +59,6 @@ struct socket_data {
unsigned int rsrc_mem_probe;
};
-static DEFINE_MUTEX(rsrc_mutex);
#define MEM_PROBE_LOW (1 << 0)
#define MEM_PROBE_HIGH (1 << 1)
@@ -274,7 +273,6 @@ static int readable(struct pcmcia_socket *s, struct resource *res,
{
int ret = -EINVAL;
- mutex_lock(&s->ops_mutex);
s->cis_mem.res = res;
s->cis_virt = ioremap(res->start, s->map_size);
if (s->cis_virt) {
@@ -288,7 +286,6 @@ static int readable(struct pcmcia_socket *s, struct resource *res,
s->cis_virt = NULL;
}
s->cis_mem.res = NULL;
- mutex_unlock(&s->ops_mutex);
if ((ret) || (*count == 0))
return -EINVAL;
return 0;
@@ -304,8 +301,6 @@ static int checksum(struct pcmcia_socket *s, struct resource *res,
int i, a = 0, b = -1, d;
void __iomem *virt;
- mutex_lock(&s->ops_mutex);
-
virt = ioremap(res->start, s->map_size);
if (virt) {
map.map = 0;
@@ -328,8 +323,6 @@ static int checksum(struct pcmcia_socket *s, struct resource *res,
iounmap(virt);
}
- mutex_unlock(&s->ops_mutex);
-
if (b == -1)
return -EINVAL;
@@ -570,8 +563,6 @@ static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s)
if (!probe_mem)
return 0;
- mutex_lock(&rsrc_mutex);
-
if (s->features & SS_CAP_PAGE_REGS)
probe_mask = MEM_PROBE_HIGH;
@@ -583,8 +574,6 @@ static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s)
}
}
- mutex_unlock(&rsrc_mutex);
-
return ret;
}
@@ -661,7 +650,6 @@ static int nonstatic_adjust_io_region(struct resource *res, unsigned long r_star
struct socket_data *s_data = s->resource_data;
int ret = -ENOMEM;
- mutex_lock(&rsrc_mutex);
for (m = s_data->io_db.next; m != &s_data->io_db; m = m->next) {
unsigned long start = m->base;
unsigned long end = m->base + m->num - 1;
@@ -672,7 +660,6 @@ static int nonstatic_adjust_io_region(struct resource *res, unsigned long r_star
ret = adjust_resource(res, r_start, r_end - r_start + 1);
break;
}
- mutex_unlock(&rsrc_mutex);
return ret;
}
@@ -706,7 +693,6 @@ static struct resource *nonstatic_find_io_region(unsigned long base, int num,
data.offset = base & data.mask;
data.map = &s_data->io_db;
- mutex_lock(&rsrc_mutex);
#ifdef CONFIG_PCI
if (s->cb_dev) {
ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
@@ -715,7 +701,6 @@ static struct resource *nonstatic_find_io_region(unsigned long base, int num,
#endif
ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
1, pcmcia_align, &data);
- mutex_unlock(&rsrc_mutex);
if (ret != 0) {
kfree(res);
@@ -748,7 +733,6 @@ static struct resource *nonstatic_find_mem_region(u_long base, u_long num,
min = 0x100000UL + base;
}
- mutex_lock(&rsrc_mutex);
#ifdef CONFIG_PCI
if (s->cb_dev) {
ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num,
@@ -758,7 +742,6 @@ static struct resource *nonstatic_find_mem_region(u_long base, u_long num,
#endif
ret = allocate_resource(&iomem_resource, res, num, min,
max, 1, pcmcia_align, &data);
- mutex_unlock(&rsrc_mutex);
if (ret == 0 || low)
break;
low = 1;
@@ -781,7 +764,6 @@ static int adjust_memory(struct pcmcia_socket *s, unsigned int action, unsigned
if (end < start)
return -EINVAL;
- mutex_lock(&rsrc_mutex);
switch (action) {
case ADD_MANAGED_RESOURCE:
ret = add_interval(&data->mem_db, start, size);
@@ -794,7 +776,6 @@ static int adjust_memory(struct pcmcia_socket *s, unsigned int action, unsigned
default:
ret = -EINVAL;
}
- mutex_unlock(&rsrc_mutex);
return ret;
}
@@ -812,7 +793,6 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
if (end > IO_SPACE_LIMIT)
return -EINVAL;
- mutex_lock(&rsrc_mutex);
switch (action) {
case ADD_MANAGED_RESOURCE:
if (add_interval(&data->io_db, start, size) != 0) {
@@ -831,7 +811,6 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
ret = -EINVAL;
break;
}
- mutex_unlock(&rsrc_mutex);
return ret;
}
@@ -929,7 +908,6 @@ static void nonstatic_release_resource_db(struct pcmcia_socket *s)
struct socket_data *data = s->resource_data;
struct resource_map *p, *q;
- mutex_lock(&rsrc_mutex);
for (p = data->mem_db.next; p != &data->mem_db; p = q) {
q = p->next;
kfree(p);
@@ -938,7 +916,6 @@ static void nonstatic_release_resource_db(struct pcmcia_socket *s)
q = p->next;
kfree(p);
}
- mutex_unlock(&rsrc_mutex);
}
@@ -965,7 +942,7 @@ static ssize_t show_io_db(struct device *dev,
struct resource_map *p;
ssize_t ret = 0;
- mutex_lock(&rsrc_mutex);
+ mutex_lock(&s->ops_mutex);
data = s->resource_data;
for (p = data->io_db.next; p != &data->io_db; p = p->next) {
@@ -977,7 +954,7 @@ static ssize_t show_io_db(struct device *dev,
((unsigned long) p->base + p->num - 1));
}
- mutex_unlock(&rsrc_mutex);
+ mutex_unlock(&s->ops_mutex);
return ret;
}
@@ -1005,9 +982,11 @@ static ssize_t store_io_db(struct device *dev,
if (end_addr < start_addr)
return -EINVAL;
+ mutex_lock(&s->ops_mutex);
ret = adjust_io(s, add, start_addr, end_addr);
if (!ret)
s->resource_setup_new = 1;
+ mutex_unlock(&s->ops_mutex);
return ret ? ret : count;
}
@@ -1021,7 +1000,7 @@ static ssize_t show_mem_db(struct device *dev,
struct resource_map *p;
ssize_t ret = 0;
- mutex_lock(&rsrc_mutex);
+ mutex_lock(&s->ops_mutex);
data = s->resource_data;
for (p = data->mem_db.next; p != &data->mem_db; p = p->next) {
@@ -1033,7 +1012,7 @@ static ssize_t show_mem_db(struct device *dev,
((unsigned long) p->base + p->num - 1));
}
- mutex_unlock(&rsrc_mutex);
+ mutex_unlock(&s->ops_mutex);
return ret;
}
@@ -1061,9 +1040,11 @@ static ssize_t store_mem_db(struct device *dev,
if (end_addr < start_addr)
return -EINVAL;
+ mutex_lock(&s->ops_mutex);
ret = adjust_memory(s, add, start_addr, end_addr);
if (!ret)
s->resource_setup_new = 1;
+ mutex_unlock(&s->ops_mutex);
return ret ? ret : count;
}
--
1.6.3.3
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