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path: root/drivers/media/rc/rc-main.c
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Diffstat (limited to 'drivers/media/rc/rc-main.c')
-rw-r--r--drivers/media/rc/rc-main.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 46da365c9c84..02e2f38c9c85 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -22,6 +22,10 @@
#include <linux/module.h>
#include "rc-core-priv.h"
+/* Bitmap to store allocated device numbers from 0 to IRRCV_NUM_DEVICES - 1 */
+#define IRRCV_NUM_DEVICES 256
+DECLARE_BITMAP(ir_core_dev_number, IRRCV_NUM_DEVICES);
+
/* Sizes are in bytes, 256 bytes allows for 32 entries on x64 */
#define IR_TAB_MIN_SIZE 256
#define IR_TAB_MAX_SIZE 8192
@@ -1065,10 +1069,9 @@ EXPORT_SYMBOL_GPL(rc_free_device);
int rc_register_device(struct rc_dev *dev)
{
static bool raw_init = false; /* raw decoders loaded? */
- static atomic_t devno = ATOMIC_INIT(0);
struct rc_map *rc_map;
const char *path;
- int rc;
+ int rc, devno;
if (!dev || !dev->map_name)
return -EINVAL;
@@ -1096,7 +1099,15 @@ int rc_register_device(struct rc_dev *dev)
*/
mutex_lock(&dev->lock);
- dev->devno = (unsigned long)(atomic_inc_return(&devno) - 1);
+ do {
+ devno = find_first_zero_bit(ir_core_dev_number,
+ IRRCV_NUM_DEVICES);
+ /* No free device slots */
+ if (devno >= IRRCV_NUM_DEVICES)
+ return -ENOMEM;
+ } while (test_and_set_bit(devno, ir_core_dev_number));
+
+ dev->devno = devno;
dev_set_name(&dev->dev, "rc%ld", dev->devno);
dev_set_drvdata(&dev->dev, dev);
rc = device_add(&dev->dev);
@@ -1186,6 +1197,7 @@ out_dev:
device_del(&dev->dev);
out_unlock:
mutex_unlock(&dev->lock);
+ clear_bit(dev->devno, ir_core_dev_number);
return rc;
}
EXPORT_SYMBOL_GPL(rc_register_device);
@@ -1197,6 +1209,8 @@ void rc_unregister_device(struct rc_dev *dev)
del_timer_sync(&dev->timer_keyup);
+ clear_bit(dev->devno, ir_core_dev_number);
+
if (dev->driver_type == RC_DRIVER_IR_RAW)
ir_raw_event_unregister(dev);