Input: evdev - switch to bitmap API

Switch to bitmap API, i.e. bitmap_alloc(), bitmap_zalloc(), to show
clearly what we are allocating. Besides that it returns pointer of
bitmap type instead of opaque void *.

While here, replace memcpy() with bitmap_copy() for sake of consistency.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 7 insertions, 9 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index c81c79d01d93..370206f987f9 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -481,7 +481,7 @@ static int evdev_release(struct inode *inode, struct file *file)
         evdev_detach_client(evdev, client);
 
         for (i = 0; i < EV_CNT; ++i)
-                kfree(client->evmasks[i]);
+                bitmap_free(client->evmasks[i]);
 
         kvfree(client);
 
@@ -925,17 +925,15 @@ static int evdev_handle_get_val(struct evdev_client *client,
 {
         int ret;
         unsigned long *mem;
-        size_t len;
 
-        len = BITS_TO_LONGS(maxbit) * sizeof(unsigned long);
-        mem = kmalloc(len, GFP_KERNEL);
+        mem = bitmap_alloc(maxbit, GFP_KERNEL);
         if (!mem)
                 return -ENOMEM;
 
         spin_lock_irq(&dev->event_lock);
         spin_lock(&client->buffer_lock);
 
-        memcpy(mem, bits, len);
+        bitmap_copy(mem, bits, maxbit);
 
         spin_unlock(&dev->event_lock);
 
@@ -947,7 +945,7 @@ static int evdev_handle_get_val(struct evdev_client *client,
         if (ret < 0)
                 evdev_queue_syn_dropped(client);
 
-        kfree(mem);
+        bitmap_free(mem);
 
         return ret;
 }
@@ -1003,13 +1001,13 @@ static int evdev_set_mask(struct evdev_client *client,
         if (!cnt)
                 return 0;
 
-        mask = kcalloc(sizeof(unsigned long), BITS_TO_LONGS(cnt), GFP_KERNEL);
+        mask = bitmap_zalloc(cnt, GFP_KERNEL);
         if (!mask)
                 return -ENOMEM;
 
         error = bits_from_user(mask, cnt - 1, codes_size, codes, compat);
         if (error < 0) {
-                kfree(mask);
+                bitmap_free(mask);
                 return error;
         }
 
@@ -1018,7 +1016,7 @@ static int evdev_set_mask(struct evdev_client *client,
         client->evmasks[type] = mask;
         spin_unlock_irqrestore(&client->buffer_lock, flags);
 
-        kfree(oldmask);
+        bitmap_free(oldmask);
 
         return 0;
 }