Hi Markus,
> One check could be repeated by the btmrvl_sdio_card_to_host() function
> during error handling even if the relevant properties can be determined
> for the involved variables before by source code analysis.
>
> * Adjust jump targets so that an extra check can be omitted at the end.
>
> * Reuse a bit of exception handling better.
>
> * Delete an initialisation for the local variable "skb"
> which became unnecessary with this refactoring.
>
> Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/bluetooth/btmrvl_sdio.c | 35 ++++++++++++++++++-----------------
> 1 file changed, 18 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/bluetooth/btmrvl_sdio.c b/drivers/bluetooth/btmrvl_sdio.c
> index 84c222abf0f7..9854addc8e96 100644
> --- a/drivers/bluetooth/btmrvl_sdio.c
> +++ b/drivers/bluetooth/btmrvl_sdio.c
> @@ -687,5 +687,5 @@ static int btmrvl_sdio_card_to_host(struct btmrvl_private *priv)
> {
> u16 buf_len = 0;
> int ret, num_blocks, blksz;
> - struct sk_buff *skb = NULL;
> + struct sk_buff *skb;
> u32 type;
> @@ -695,16 +695,14 @@ static int btmrvl_sdio_card_to_host(struct btmrvl_private *priv)
>
> if (!card || !card->func) {
> BT_ERR("card or function is NULL!");
> - ret = -EINVAL;
> - goto exit;
> + goto e_inval;
> }
>
> /* Read the length of data to be transferred */
> ret = btmrvl_sdio_read_rx_len(card, &buf_len);
> if (ret < 0) {
> BT_ERR("read rx_len failed");
> - ret = -EIO;
> - goto exit;
> + goto e_io;
> }
>
> blksz = SDIO_BLOCK_SIZE;
> @@ -713,8 +711,7 @@ static int btmrvl_sdio_card_to_host(struct btmrvl_private *priv)
> if (buf_len <= SDIO_HEADER_LEN
> || (num_blocks * blksz) > ALLOC_BUF_SIZE) {
> BT_ERR("invalid packet length: %d", buf_len);
> - ret = -EINVAL;
> - goto exit;
> + goto e_inval;
> }
>
> /* Allocate buffer */
> @@ -722,7 +719,7 @@ static int btmrvl_sdio_card_to_host(struct btmrvl_private *priv)
> if (!skb) {
> BT_ERR("No free skb");
> ret = -ENOMEM;
> - goto exit;
> + goto increment_counter;
> }
>
> if ((unsigned long) skb->data & (BTSDIO_DMA_ALIGN - 1)) {
> @@ -738,8 +735,7 @@ static int btmrvl_sdio_card_to_host(struct btmrvl_private *priv)
> num_blocks * blksz);
> if (ret < 0) {
> BT_ERR("readsb failed: %d", ret);
> - ret = -EIO;
> - goto exit;
> + goto free_skb;
> }
>
> /* This is SDIO specific header length: byte[2][1][0], type: byte[3]
> @@ -753,8 +749,7 @@ static int btmrvl_sdio_card_to_host(struct btmrvl_private *priv)
> if (buf_len > blksz * num_blocks) {
> BT_ERR("Skip incorrect packet: hdrlen %d buffer %d",
> buf_len, blksz * num_blocks);
> - ret = -EIO;
> - goto exit;
> + goto free_skb;
> }
>
> type = payload[3];
> @@ -797,12 +792,18 @@ static int btmrvl_sdio_card_to_host(struct btmrvl_private *priv)
> break;
> }
>
> -exit:
> - if (ret) {
> - hdev->stat.err_rx++;
> - kfree_skb(skb);
> - }
> + return 0;
> +
> +free_skb:
> + kfree_skb(skb);
> +e_io:
> + ret = -EIO;
> + goto increment_counter;
>
> +e_inval:
> + ret = -EINVAL;
> +increment_counter:
> + hdev->stat.err_rx++;
> return ret;
Nope!
This is not easier to read for me. This goto exit jumping and I hate that. Actually to be honest this kind of goto jumping makes my brain hurt and I want to avoid it.
Regards
Marcel
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