summaryrefslogtreecommitdiffstats
path: root/drivers/misc/phantom.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/misc/phantom.c')
-rw-r--r--drivers/misc/phantom.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/misc/phantom.c b/drivers/misc/phantom.c
index 75ee0d3f6f4..b05db55c8c8 100644
--- a/drivers/misc/phantom.c
+++ b/drivers/misc/phantom.c
@@ -24,7 +24,7 @@
#include <linux/slab.h>
#include <linux/phantom.h>
#include <linux/sched.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <asm/atomic.h>
#include <asm/io.h>
@@ -38,6 +38,7 @@
#define PHB_RUNNING 1
#define PHB_NOT_OH 2
+static DEFINE_MUTEX(phantom_mutex);
static struct class *phantom_class;
static int phantom_major;
@@ -215,17 +216,17 @@ static int phantom_open(struct inode *inode, struct file *file)
struct phantom_device *dev = container_of(inode->i_cdev,
struct phantom_device, cdev);
- lock_kernel();
+ mutex_lock(&phantom_mutex);
nonseekable_open(inode, file);
if (mutex_lock_interruptible(&dev->open_lock)) {
- unlock_kernel();
+ mutex_unlock(&phantom_mutex);
return -ERESTARTSYS;
}
if (dev->opened) {
mutex_unlock(&dev->open_lock);
- unlock_kernel();
+ mutex_unlock(&phantom_mutex);
return -EINVAL;
}
@@ -236,7 +237,7 @@ static int phantom_open(struct inode *inode, struct file *file)
atomic_set(&dev->counter, 0);
dev->opened++;
mutex_unlock(&dev->open_lock);
- unlock_kernel();
+ mutex_unlock(&phantom_mutex);
return 0;
}
@@ -279,6 +280,7 @@ static const struct file_operations phantom_file_ops = {
.unlocked_ioctl = phantom_ioctl,
.compat_ioctl = phantom_compat_ioctl,
.poll = phantom_poll,
+ .llseek = no_llseek,
};
static irqreturn_t phantom_isr(int irq, void *data)
@@ -341,8 +343,10 @@ static int __devinit phantom_probe(struct pci_dev *pdev,
int retval;
retval = pci_enable_device(pdev);
- if (retval)
+ if (retval) {
+ dev_err(&pdev->dev, "pci_enable_device failed!\n");
goto err;
+ }
minor = phantom_get_free();
if (minor == PHANTOM_MAX_MINORS) {
@@ -354,8 +358,10 @@ static int __devinit phantom_probe(struct pci_dev *pdev,
phantom_devices[minor] = 1;
retval = pci_request_regions(pdev, "phantom");
- if (retval)
+ if (retval) {
+ dev_err(&pdev->dev, "pci_request_regions failed!\n");
goto err_null;
+ }
retval = -ENOMEM;
pht = kzalloc(sizeof(*pht), GFP_KERNEL);