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SubjectRe: [PATCH] drivers/usb/gadget: Use ERR_PTR/IS_ERR
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On Wednesday 09 December 2009, Julia Lawall wrote:
> From: Julia Lawall <julia@diku.dk>
>
> Use ERR_PTR and IS_ERR rather than mixing integers and pointers.
>
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @@
> expression *E;
> @@
>
> * E < 0
> // </smpl>
>
> Signed-off-by: Julia Lawall <julia@diku.dk>

Acked-by: David Brownell <dbrownell@users.sourceforge.net>

>
> ---
> drivers/usb/gadget/f_audio.c | 8 +++++---
> 1 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/gadget/f_audio.c b/drivers/usb/gadget/f_audio.c
> index c43c89f..0f2eee1 100644
> --- a/drivers/usb/gadget/f_audio.c
> +++ b/drivers/usb/gadget/f_audio.c
> @@ -252,12 +252,12 @@ static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
>
> copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
> if (!copy_buf)
> - return (struct f_audio_buf *)-ENOMEM;
> + return ERR_PTR(-ENOMEM);
>
> copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
> if (!copy_buf->buf) {
> kfree(copy_buf);
> - return (struct f_audio_buf *)-ENOMEM;
> + return ERR_PTR(-ENOMEM);
> }
>
> return copy_buf;
> @@ -332,7 +332,7 @@ static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
> list_add_tail(&copy_buf->list, &audio->play_queue);
> schedule_work(&audio->playback_work);
> copy_buf = f_audio_buffer_alloc(audio_buf_size);
> - if (copy_buf < 0)
> + if (IS_ERR(copy_buf))
> return -ENOMEM;
> }
>
> @@ -576,6 +576,8 @@ static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
> usb_ep_enable(out_ep, audio->out_desc);
> out_ep->driver_data = audio;
> audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
> + if (IS_ERR(audio->copy_buf))
> + return -ENOMEM;
>
> /*
> * allocate a bunch of read buffers
>
>




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