Hi Andy,
On Fri, Jun 15, 2018 at 04:20:17PM +0300, Andy Shevchenko wrote:
> Switch to bitmap_zalloc() to show clearly what we are allocating.
> Besides that it returns pointer of bitmap type instead of opaque void *.
>
> Acked-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
> drivers/input/evdev.c | 16 +++++++---------
> 1 file 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;
But in commit message you say you switch to bitmap_zalloc(). IIUC
bitmap_alloc() is OK here. But could you please update comment to
avoid confusing.
>
> 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 my understanding of bits_from_user() correct, here you can also use
bitmap_alloc(), true?
> 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;
> }
> --
> 2.17.1
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