coresight: etb10: moving to local atomic operations

[cascardo/linux.git] / drivers / hwtracing / coresight / coresight-etb10.c

diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 917562e..162c9cc 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -10,6 +10,7 @@
  * GNU General Public License for more details.
  */
 
+#include <asm/local.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -71,7 +72,7 @@
  * @csdev:     component vitals needed by the framework.
  * @miscdev:   specifics to handle "/dev/xyz.etb" entry.
  * @spinlock:  only one at a time pls.
- * @in_use:    synchronise user space access to etb buffer.
+ * @reading:   synchronise user space access to etb buffer.
  * @buf:       area of memory where ETB buffer content gets sent.
  * @buffer_depth: size of @buf.
  * @enable:    this ETB is being used.
@@ -84,7 +85,7 @@ struct etb_drvdata {
        struct coresight_device *csdev;
        struct miscdevice       miscdev;
        spinlock_t              spinlock;
-       atomic_t                in_use;
+       local_t                 reading;
        u8                      *buf;
        u32                     buffer_depth;
        bool                    enable;
@@ -277,7 +278,7 @@ static int etb_open(struct inode *inode, struct file *file)
        struct etb_drvdata *drvdata = container_of(file->private_data,
                                                   struct etb_drvdata, miscdev);
 
-       if (atomic_cmpxchg(&drvdata->in_use, 0, 1))
+       if (local_cmpxchg(&drvdata->reading, 0, 1))
                return -EBUSY;
 
        dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
@@ -313,7 +314,7 @@ static int etb_release(struct inode *inode, struct file *file)
 {
        struct etb_drvdata *drvdata = container_of(file->private_data,
                                                   struct etb_drvdata, miscdev);
-       atomic_set(&drvdata->in_use, 0);
+       local_set(&drvdata->reading, 0);
 
        dev_dbg(drvdata->dev, "%s: released\n", __func__);
        return 0;