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staging: unisys: visorinput: make lock_visor_dev a mutex

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Since lock_visor_dev is a binary semaphore it makes more sense to
use a mutex lock.

Signed-off-by: Tim Sell <Timothy.Sell@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Acked-By: Neil Horman <nhorman@tuxdriver.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tim Sell 2016-06-10 21:48:26 -04:00 committed by Greg Kroah-Hartman
parent 24ce1b6661
commit 8dfb8fdbd2
1 changed files with 17 additions and 17 deletions
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34
drivers/staging/unisys/visorinput/visorinput.c
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@ -63,7 +63,7 @@ enum visorinput_device_type {
*/
struct visorinput_devdata {
struct visor_device *dev;
struct rw_semaphore lock_visor_dev; /* lock for dev */
struct mutex lock_visor_dev; /* lock for dev */
struct input_dev *visorinput_dev;
bool paused;
bool interrupts_enabled;
@ -236,14 +236,14 @@ static int visorinput_open(struct input_dev *visorinput_dev)
* interrupts should be enabled so when we resume, interrupts
* will really be enabled.
*/
down_write(&devdata->lock_visor_dev);
mutex_lock(&devdata->lock_visor_dev);
devdata->interrupts_enabled = true;
if (devdata->paused)
goto out_unlock;
visorbus_enable_channel_interrupts(devdata->dev);
out_unlock:
up_write(&devdata->lock_visor_dev);
mutex_unlock(&devdata->lock_visor_dev);
return 0;
}
@ -266,14 +266,14 @@ static void visorinput_close(struct input_dev *visorinput_dev)
* not re-enable them.
*/
down_write(&devdata->lock_visor_dev);
mutex_lock(&devdata->lock_visor_dev);
devdata->interrupts_enabled = false;
if (devdata->paused)
goto out_unlock;
visorbus_disable_channel_interrupts(devdata->dev);
out_unlock:
up_write(&devdata->lock_visor_dev);
mutex_unlock(&devdata->lock_visor_dev);
}
/*
@ -377,8 +377,8 @@ devdata_create(struct visor_device *dev, enum visorinput_device_type devtype)
devdata = kzalloc(sizeof(*devdata) + extra_bytes, GFP_KERNEL);
if (!devdata)
return NULL;
init_rwsem(&devdata->lock_visor_dev);
down_write(&devdata->lock_visor_dev);
mutex_init(&devdata->lock_visor_dev);
mutex_lock(&devdata->lock_visor_dev);
devdata->dev = dev;
/*
@ -414,7 +414,7 @@ devdata_create(struct visor_device *dev, enum visorinput_device_type devtype)
}
dev_set_drvdata(&dev->device, devdata);
up_write(&devdata->lock_visor_dev);
mutex_unlock(&devdata->lock_visor_dev);
/*
* Device struct is completely set up now, with the exception of
@ -428,7 +428,7 @@ devdata_create(struct visor_device *dev, enum visorinput_device_type devtype)
goto err_kfree_devdata;
}
down_write(&devdata->lock_visor_dev);
mutex_lock(&devdata->lock_visor_dev);
/*
* Establish calls to visorinput_channel_interrupt() if that is
* the desired state that we've kept track of in interrupts_enabled
@ -437,12 +437,12 @@ devdata_create(struct visor_device *dev, enum visorinput_device_type devtype)
devdata->paused = false;
if (devdata->interrupts_enabled)
visorbus_enable_channel_interrupts(dev);
up_write(&devdata->lock_visor_dev);
mutex_unlock(&devdata->lock_visor_dev);
return devdata;
cleanups_register:
up_write(&devdata->lock_visor_dev);
mutex_unlock(&devdata->lock_visor_dev);
err_kfree_devdata:
kfree(devdata);
return NULL;
@ -482,7 +482,7 @@ visorinput_remove(struct visor_device *dev)
if (!devdata)
return;
down_write(&devdata->lock_visor_dev);
mutex_lock(&devdata->lock_visor_dev);
visorbus_disable_channel_interrupts(dev);
/*
@ -491,7 +491,7 @@ visorinput_remove(struct visor_device *dev)
*/
dev_set_drvdata(&dev->device, NULL);
up_write(&devdata->lock_visor_dev);
mutex_unlock(&devdata->lock_visor_dev);
unregister_client_input(devdata->visorinput_dev);
kfree(devdata);
@ -671,7 +671,7 @@ visorinput_pause(struct visor_device *dev,
goto out;
}
down_write(&devdata->lock_visor_dev);
mutex_lock(&devdata->lock_visor_dev);
if (devdata->paused) {
rc = -EBUSY;
goto out_locked;
@ -688,7 +688,7 @@ visorinput_pause(struct visor_device *dev,
complete_func(dev, 0);
rc = 0;
out_locked:
up_write(&devdata->lock_visor_dev);
mutex_unlock(&devdata->lock_visor_dev);
out:
return rc;
}
@ -704,7 +704,7 @@ visorinput_resume(struct visor_device *dev,
rc = -ENODEV;
goto out;
}
down_write(&devdata->lock_visor_dev);
mutex_lock(&devdata->lock_visor_dev);
if (!devdata->paused) {
rc = -EBUSY;
goto out_locked;
@ -722,7 +722,7 @@ visorinput_resume(struct visor_device *dev,
rc = 0;
out_locked:
up_write(&devdata->lock_visor_dev);
mutex_unlock(&devdata->lock_visor_dev);
out:
return rc;
}