[PATCH] pcmcia: use mutexes instead of semaphores
Use mutexes in the PCMICA core, as they suffice for what needs to be done.
Includes a bugfix from and Signed-off-by Andrew Morton.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index 45cffbf..907a676 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -111,9 +111,9 @@
list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
if (socket->dev.dev != dev)
continue;
- down(&socket->skt_sem);
+ mutex_lock(&socket->skt_mutex);
socket_suspend(socket);
- up(&socket->skt_sem);
+ mutex_unlock(&socket->skt_mutex);
}
up_read(&pcmcia_socket_list_rwsem);
@@ -129,9 +129,9 @@
list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
if (socket->dev.dev != dev)
continue;
- down(&socket->skt_sem);
+ mutex_lock(&socket->skt_mutex);
socket_resume(socket);
- up(&socket->skt_sem);
+ mutex_unlock(&socket->skt_mutex);
}
up_read(&pcmcia_socket_list_rwsem);
@@ -237,7 +237,7 @@
init_completion(&socket->socket_released);
init_completion(&socket->thread_done);
init_waitqueue_head(&socket->thread_wait);
- init_MUTEX(&socket->skt_sem);
+ mutex_init(&socket->skt_mutex);
spin_lock_init(&socket->thread_lock);
ret = kernel_thread(pccardd, socket, CLONE_KERNEL);
@@ -662,7 +662,7 @@
spin_unlock_irqrestore(&skt->thread_lock, flags);
if (events) {
- down(&skt->skt_sem);
+ mutex_lock(&skt->skt_mutex);
if (events & SS_DETECT)
socket_detect_change(skt);
if (events & SS_BATDEAD)
@@ -671,7 +671,7 @@
send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
if (events & SS_READY)
send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
- up(&skt->skt_sem);
+ mutex_unlock(&skt->skt_mutex);
continue;
}
@@ -715,8 +715,8 @@
{
int ret = 0;
- /* s->skt_sem also protects s->callback */
- down(&s->skt_sem);
+ /* s->skt_mutex also protects s->callback */
+ mutex_lock(&s->skt_mutex);
if (c) {
/* registration */
@@ -732,7 +732,7 @@
} else
s->callback = NULL;
err:
- up(&s->skt_sem);
+ mutex_unlock(&s->skt_mutex);
return ret;
}
@@ -750,7 +750,7 @@
cs_dbg(skt, 1, "resetting socket\n");
- down(&skt->skt_sem);
+ mutex_lock(&skt->skt_mutex);
do {
if (!(skt->state & SOCKET_PRESENT)) {
ret = CS_NO_CARD;
@@ -779,7 +779,7 @@
ret = CS_SUCCESS;
} while (0);
- up(&skt->skt_sem);
+ mutex_unlock(&skt->skt_mutex);
return ret;
} /* reset_card */
@@ -795,7 +795,7 @@
cs_dbg(skt, 1, "suspending socket\n");
- down(&skt->skt_sem);
+ mutex_lock(&skt->skt_mutex);
do {
if (!(skt->state & SOCKET_PRESENT)) {
ret = CS_NO_CARD;
@@ -812,7 +812,7 @@
}
ret = socket_suspend(skt);
} while (0);
- up(&skt->skt_sem);
+ mutex_unlock(&skt->skt_mutex);
return ret;
} /* suspend_card */
@@ -825,7 +825,7 @@
cs_dbg(skt, 1, "waking up socket\n");
- down(&skt->skt_sem);
+ mutex_lock(&skt->skt_mutex);
do {
if (!(skt->state & SOCKET_PRESENT)) {
ret = CS_NO_CARD;
@@ -839,7 +839,7 @@
if (!ret && skt->callback)
skt->callback->resume(skt);
} while (0);
- up(&skt->skt_sem);
+ mutex_unlock(&skt->skt_mutex);
return ret;
} /* resume_card */
@@ -853,7 +853,7 @@
cs_dbg(skt, 1, "user eject request\n");
- down(&skt->skt_sem);
+ mutex_lock(&skt->skt_mutex);
do {
if (!(skt->state & SOCKET_PRESENT)) {
ret = -ENODEV;
@@ -869,7 +869,7 @@
socket_remove(skt);
ret = 0;
} while (0);
- up(&skt->skt_sem);
+ mutex_unlock(&skt->skt_mutex);
return ret;
} /* eject_card */
@@ -882,7 +882,7 @@
cs_dbg(skt, 1, "user insert request\n");
- down(&skt->skt_sem);
+ mutex_lock(&skt->skt_mutex);
do {
if (skt->state & SOCKET_PRESENT) {
ret = -EBUSY;
@@ -894,7 +894,7 @@
}
ret = 0;
} while (0);
- up(&skt->skt_sem);
+ mutex_unlock(&skt->skt_mutex);
return ret;
} /* insert_card */
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 37ba124..3b7e1ba 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -564,7 +564,7 @@
* won't work, this doesn't matter much at the moment: the driver core doesn't
* support it either.
*/
-static DECLARE_MUTEX(device_add_lock);
+static DEFINE_MUTEX(device_add_lock);
struct pcmcia_device * pcmcia_device_add(struct pcmcia_socket *s, unsigned int function)
{
@@ -576,7 +576,7 @@
if (!s)
return NULL;
- down(&device_add_lock);
+ mutex_lock(&device_add_lock);
/* max of 2 devices per card */
if (s->device_count == 2)
@@ -640,7 +640,7 @@
if (device_register(&p_dev->dev))
goto err_unreg;
- up(&device_add_lock);
+ mutex_unlock(&device_add_lock);
return p_dev;
@@ -654,7 +654,7 @@
kfree(p_dev);
s->device_count--;
err_put:
- up(&device_add_lock);
+ mutex_unlock(&device_add_lock);
pcmcia_put_socket(s);
return NULL;
@@ -713,7 +713,7 @@
int no_devices=0;
unsigned long flags;
- /* must be called with skt_sem held */
+ /* must be called with skt_mutex held */
spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
if (list_empty(&skt->devices_list))
no_devices=1;
@@ -999,9 +999,9 @@
if (!count)
return -EINVAL;
- down(&p_dev->socket->skt_sem);
+ mutex_lock(&p_dev->socket->skt_mutex);
p_dev->allow_func_id_match = 1;
- up(&p_dev->socket->skt_sem);
+ mutex_unlock(&p_dev->socket->skt_mutex);
bus_rescan_devices(&pcmcia_bus_type);
diff --git a/drivers/pcmcia/pcmcia_ioctl.c b/drivers/pcmcia/pcmcia_ioctl.c
index 56b625d..8eceba7 100644
--- a/drivers/pcmcia/pcmcia_ioctl.c
+++ b/drivers/pcmcia/pcmcia_ioctl.c
@@ -269,9 +269,9 @@
/*
* Prevent this racing with a card insertion.
*/
- down(&s->skt_sem);
+ mutex_lock(&s->skt_mutex);
bus_rescan_devices(&pcmcia_bus_type);
- up(&s->skt_sem);
+ mutex_unlock(&s->skt_mutex);
/* check whether the driver indeed matched. I don't care if this
* is racy or not, because it can only happen on cardmgr access
@@ -606,9 +606,9 @@
}
break;
case DS_GET_FIRST_TUPLE:
- down(&s->skt_sem);
+ mutex_lock(&s->skt_mutex);
pcmcia_validate_mem(s);
- up(&s->skt_sem);
+ mutex_unlock(&s->skt_mutex);
ret = pccard_get_first_tuple(s, BIND_FN_ALL, &buf->tuple);
break;
case DS_GET_NEXT_TUPLE:
@@ -637,9 +637,9 @@
}
break;
case DS_VALIDATE_CIS:
- down(&s->skt_sem);
+ mutex_lock(&s->skt_mutex);
pcmcia_validate_mem(s);
- up(&s->skt_sem);
+ mutex_unlock(&s->skt_mutex);
ret = pccard_validate_cis(s, BIND_FN_ALL, &buf->cisinfo);
break;
case DS_SUSPEND_CARD:
diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 5301ac6..6da4a03 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -61,7 +61,7 @@
unsigned int rsrc_mem_probe;
};
-static DECLARE_MUTEX(rsrc_sem);
+static DEFINE_MUTEX(rsrc_mutex);
#define MEM_PROBE_LOW (1 << 0)
#define MEM_PROBE_HIGH (1 << 1)
@@ -484,7 +484,7 @@
/*
- * Locking note: Must be called with skt_sem held!
+ * Locking note: Must be called with skt_mutex held!
*/
static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s)
{
@@ -495,7 +495,7 @@
if (!probe_mem)
return 0;
- down(&rsrc_sem);
+ mutex_lock(&rsrc_mutex);
if (s->features & SS_CAP_PAGE_REGS)
probe_mask = MEM_PROBE_HIGH;
@@ -507,7 +507,7 @@
s_data->rsrc_mem_probe |= probe_mask;
}
- up(&rsrc_sem);
+ mutex_unlock(&rsrc_mutex);
return ret;
}
@@ -585,7 +585,7 @@
struct socket_data *s_data = s->resource_data;
int ret = -ENOMEM;
- down(&rsrc_sem);
+ 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;
@@ -596,7 +596,7 @@
ret = adjust_resource(res, r_start, r_end - r_start + 1);
break;
}
- up(&rsrc_sem);
+ mutex_unlock(&rsrc_mutex);
return ret;
}
@@ -630,7 +630,7 @@
data.offset = base & data.mask;
data.map = &s_data->io_db;
- down(&rsrc_sem);
+ mutex_lock(&rsrc_mutex);
#ifdef CONFIG_PCI
if (s->cb_dev) {
ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
@@ -639,7 +639,7 @@
#endif
ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
1, pcmcia_align, &data);
- up(&rsrc_sem);
+ mutex_unlock(&rsrc_mutex);
if (ret != 0) {
kfree(res);
@@ -672,7 +672,7 @@
min = 0x100000UL + base;
}
- down(&rsrc_sem);
+ mutex_lock(&rsrc_mutex);
#ifdef CONFIG_PCI
if (s->cb_dev) {
ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num,
@@ -682,7 +682,7 @@
#endif
ret = allocate_resource(&iomem_resource, res, num, min,
max, 1, pcmcia_align, &data);
- up(&rsrc_sem);
+ mutex_unlock(&rsrc_mutex);
if (ret == 0 || low)
break;
low = 1;
@@ -705,7 +705,7 @@
if (end < start)
return -EINVAL;
- down(&rsrc_sem);
+ mutex_lock(&rsrc_mutex);
switch (action) {
case ADD_MANAGED_RESOURCE:
ret = add_interval(&data->mem_db, start, size);
@@ -723,7 +723,7 @@
default:
ret = -EINVAL;
}
- up(&rsrc_sem);
+ mutex_unlock(&rsrc_mutex);
return ret;
}
@@ -741,7 +741,7 @@
if (end > IO_SPACE_LIMIT)
return -EINVAL;
- down(&rsrc_sem);
+ mutex_lock(&rsrc_mutex);
switch (action) {
case ADD_MANAGED_RESOURCE:
if (add_interval(&data->io_db, start, size) != 0) {
@@ -760,7 +760,7 @@
ret = -EINVAL;
break;
}
- up(&rsrc_sem);
+ mutex_unlock(&rsrc_mutex);
return ret;
}
@@ -867,7 +867,7 @@
struct socket_data *data = s->resource_data;
struct resource_map *p, *q;
- down(&rsrc_sem);
+ mutex_lock(&rsrc_mutex);
for (p = data->mem_db.next; p != &data->mem_db; p = q) {
q = p->next;
kfree(p);
@@ -876,7 +876,7 @@
q = p->next;
kfree(p);
}
- up(&rsrc_sem);
+ mutex_unlock(&rsrc_mutex);
}
@@ -901,7 +901,7 @@
struct resource_map *p;
ssize_t ret = 0;
- down(&rsrc_sem);
+ mutex_lock(&rsrc_mutex);
data = s->resource_data;
for (p = data->io_db.next; p != &data->io_db; p = p->next) {
@@ -913,7 +913,7 @@
((unsigned long) p->base + p->num - 1));
}
- up(&rsrc_sem);
+ mutex_unlock(&rsrc_mutex);
return (ret);
}
@@ -953,7 +953,7 @@
struct resource_map *p;
ssize_t ret = 0;
- down(&rsrc_sem);
+ mutex_lock(&rsrc_mutex);
data = s->resource_data;
for (p = data->mem_db.next; p != &data->mem_db; p = p->next) {
@@ -965,7 +965,7 @@
((unsigned long) p->base + p->num - 1));
}
- up(&rsrc_sem);
+ mutex_unlock(&rsrc_mutex);
return (ret);
}
diff --git a/drivers/pcmcia/socket_sysfs.c b/drivers/pcmcia/socket_sysfs.c
index 5ab1cde..83c6b31 100644
--- a/drivers/pcmcia/socket_sysfs.c
+++ b/drivers/pcmcia/socket_sysfs.c
@@ -25,6 +25,7 @@
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/device.h>
+#include <linux/mutex.h>
#include <asm/system.h>
#include <asm/irq.h>
@@ -183,7 +184,7 @@
s->resource_setup_done = 1;
spin_unlock_irqrestore(&s->lock, flags);
- down(&s->skt_sem);
+ mutex_lock(&s->skt_mutex);
if ((s->callback) &&
(s->state & SOCKET_PRESENT) &&
!(s->state & SOCKET_CARDBUS)) {
@@ -192,7 +193,7 @@
module_put(s->callback->owner);
}
}
- up(&s->skt_sem);
+ mutex_unlock(&s->skt_mutex);
return count;
}
@@ -322,7 +323,7 @@
kfree(cis);
if (!ret) {
- down(&s->skt_sem);
+ mutex_lock(&s->skt_mutex);
if ((s->callback) && (s->state & SOCKET_PRESENT) &&
!(s->state & SOCKET_CARDBUS)) {
if (try_module_get(s->callback->owner)) {
@@ -330,7 +331,7 @@
module_put(s->callback->owner);
}
}
- up(&s->skt_sem);
+ mutex_unlock(&s->skt_mutex);
}
diff --git a/include/pcmcia/ss.h b/include/pcmcia/ss.h
index 6529ccc..fa527c2 100644
--- a/include/pcmcia/ss.h
+++ b/include/pcmcia/ss.h
@@ -18,6 +18,7 @@
#include <linux/config.h>
#include <linux/device.h>
#include <linux/sched.h> /* task_struct, completion */
+#include <linux/mutex.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
@@ -240,7 +241,7 @@
#endif
/* state thread */
- struct semaphore skt_sem; /* protects socket h/w state */
+ struct mutex skt_mutex; /* protects socket h/w state */
struct task_struct *thread;
struct completion thread_done;
