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[PATCH] pcmcia: use mutexes instead of semaphores

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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>
This commit is contained in:
Dominik Brodowski
2006-01-10 21:20:36 +01:00
parent cbbddd1046
commit 7fe908dd11
6 changed files with 60 additions and 58 deletions
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40
drivers/pcmcia/cs.c
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@@ -111,9 +111,9 @@ int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
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 @@ int pcmcia_socket_dev_resume(struct device *dev)
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 @@ int pcmcia_register_socket(struct pcmcia_socket *socket)
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 @@ static int pccardd(void *__skt)
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 @@ static int pccardd(void *__skt)
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 pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
{
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 @@ int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
} else
s->callback = NULL;
err:
up(&s->skt_sem);
mutex_unlock(&s->skt_mutex);
return ret;
}
@@ -750,7 +750,7 @@ int pccard_reset_card(struct pcmcia_socket *skt)
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 @@ int pccard_reset_card(struct pcmcia_socket *skt)
ret = CS_SUCCESS;
} while (0);
up(&skt->skt_sem);
mutex_unlock(&skt->skt_mutex);
return ret;
} /* reset_card */
@@ -795,7 +795,7 @@ int pcmcia_suspend_card(struct pcmcia_socket *skt)
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 @@ int pcmcia_suspend_card(struct pcmcia_socket *skt)
}
ret = socket_suspend(skt);
} while (0);
up(&skt->skt_sem);
mutex_unlock(&skt->skt_mutex);
return ret;
} /* suspend_card */
@@ -825,7 +825,7 @@ int pcmcia_resume_card(struct pcmcia_socket *skt)
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 @@ int pcmcia_resume_card(struct pcmcia_socket *skt)
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 @@ int pcmcia_eject_card(struct pcmcia_socket *skt)
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 @@ int pcmcia_eject_card(struct pcmcia_socket *skt)
socket_remove(skt);
ret = 0;
} while (0);
up(&skt->skt_sem);
mutex_unlock(&skt->skt_mutex);
return ret;
} /* eject_card */
@@ -882,7 +882,7 @@ int pcmcia_insert_card(struct pcmcia_socket *skt)
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 @@ int pcmcia_insert_card(struct pcmcia_socket *skt)
}
ret = 0;
} while (0);
up(&skt->skt_sem);
mutex_unlock(&skt->skt_mutex);
return ret;
} /* insert_card */