diff options
| -rw-r--r-- | drivers/media/rc/rc-main.c | 20 |
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); |