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[POWERPC] powermac i2c: Use mutex 

Convert the semaphores in low_i2c that are used as mutexes to real
mutexes.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Johannes Berg 2007-07-04 09:01:54 +10:00 committed by Paul Mackerras
parent 0b7dbfbf13
commit 76a5b8bb35
1 changed files with 12 additions and 11 deletions
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23
arch/powerpc/platforms/powermac/low_i2c.c
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@ -42,6 +42,7 @@
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/timer.h>
#include <linux/mutex.h>
#include <asm/keylargo.h>
#include <asm/uninorth.h>
#include <asm/io.h>
@ -84,7 +85,7 @@ struct pmac_i2c_bus
void *hostdata;
int channel; /* some hosts have multiple */
int mode; /* current mode */
struct semaphore sem;
struct mutex mutex;
int opened;
int polled; /* open mode */
struct platform_device *platform_dev;
@ -104,7 +105,7 @@ static LIST_HEAD(pmac_i2c_busses);
struct pmac_i2c_host_kw
{
struct semaphore mutex; /* Access mutex for use by
struct mutex mutex; /* Access mutex for use by
* i2c-keywest */
void __iomem *base; /* register base address */
int bsteps; /* register stepping */
@ -375,14 +376,14 @@ static void kw_i2c_timeout(unsigned long data)
static int kw_i2c_open(struct pmac_i2c_bus *bus)
{
struct pmac_i2c_host_kw *host = bus->hostdata;
down(&host->mutex);
mutex_lock(&host->mutex);
return 0;
}
static void kw_i2c_close(struct pmac_i2c_bus *bus)
{
struct pmac_i2c_host_kw *host = bus->hostdata;
up(&host->mutex);
mutex_unlock(&host->mutex);
}
static int kw_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
@ -498,7 +499,7 @@ static struct pmac_i2c_host_kw *__init kw_i2c_host_init(struct device_node *np)
kfree(host);
return NULL;
}
init_MUTEX(&host->mutex);
mutex_init(&host->mutex);
init_completion(&host->complete);
spin_lock_init(&host->lock);
init_timer(&host->timeout_timer);
@ -571,7 +572,7 @@ static void __init kw_i2c_add(struct pmac_i2c_host_kw *host,
bus->open = kw_i2c_open;
bus->close = kw_i2c_close;
bus->xfer = kw_i2c_xfer;
init_MUTEX(&bus->sem);
mutex_init(&bus->mutex);
if (controller == busnode)
bus->flags = pmac_i2c_multibus;
list_add(&bus->link, &pmac_i2c_busses);
@ -798,7 +799,7 @@ static void __init pmu_i2c_probe(void)
bus->mode = pmac_i2c_mode_std;
bus->hostdata = bus + 1;
bus->xfer = pmu_i2c_xfer;
init_MUTEX(&bus->sem);
mutex_init(&bus->mutex);
bus->flags = pmac_i2c_multibus;
list_add(&bus->link, &pmac_i2c_busses);
@ -921,7 +922,7 @@ static void __init smu_i2c_probe(void)
bus->mode = pmac_i2c_mode_std;
bus->hostdata = bus + 1;
bus->xfer = smu_i2c_xfer;
init_MUTEX(&bus->sem);
mutex_init(&bus->mutex);
bus->flags = 0;
list_add(&bus->link, &pmac_i2c_busses);
@ -1093,13 +1094,13 @@ int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled)
{
int rc;
down(&bus->sem);
mutex_lock(&bus->mutex);
bus->polled = polled || pmac_i2c_force_poll;
bus->opened = 1;
bus->mode = pmac_i2c_mode_std;
if (bus->open && (rc = bus->open(bus)) != 0) {
bus->opened = 0;
up(&bus->sem);
mutex_unlock(&bus->mutex);
return rc;
}
return 0;
@ -1112,7 +1113,7 @@ void pmac_i2c_close(struct pmac_i2c_bus *bus)
if (bus->close)
bus->close(bus);
bus->opened = 0;
up(&bus->sem);
mutex_unlock(&bus->mutex);
}
EXPORT_SYMBOL_GPL(pmac_i2c_close);