This patch makes the code better and it's an improvement so I'm fine
with merging it as-is.
On Sun, Apr 24, 2016 at 07:40:13PM +0300, Claudiu Beznea wrote:
> This patch frees memory allocated inside mkimage() in case mkimage()
> or any other subsequent calls inside prism2_fwapply() from prism2fw.c
> file fails. To fix this I introduces goto labels where the free
> operation is done in case some operations fails. After the introduction
> of goto labels has been done, in order to use the same return path,
> "return x" instuctions were replaced with "goto" instuctions.
>
> Signed-off-by: Claudiu Beznea <claudiu.bez...@gmail.com>
> ---
> drivers/staging/wlan-ng/prism2fw.c | 28 ++++++++++++++++------------
> 1 file changed, 16 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/staging/wlan-ng/prism2fw.c
> b/drivers/staging/wlan-ng/prism2fw.c
> index 8564d9e..56bffd9 100644
> --- a/drivers/staging/wlan-ng/prism2fw.c
> +++ b/drivers/staging/wlan-ng/prism2fw.c
> @@ -278,7 +278,8 @@ static int prism2_fwapply(const struct ihex_binrec *rfptr,
> /* Build the PDA we're going to use. */
> if (read_cardpda(&pda, wlandev)) {
> netdev_err(wlandev->netdev, "load_cardpda failed, exiting.\n");
> - return 1;
> + result = 1;
> + goto out;
It's better to do direct returns instead of misleading gotos that don't
do anything. "Future proofing" is a waste of time and introduces more
bugs than it prevents. Just write for the present. Present proof the
code.
> }
>
> /* read the card's PRI-SUP */
> @@ -315,55 +316,58 @@ static int prism2_fwapply(const struct ihex_binrec
> *rfptr,
> if (result) {
> netdev_err(wlandev->netdev,
> "Failed to read the data exiting.\n");
> - return 1;
> + goto out;
After this should be goto free_srecs not goto out. I don't know that
it matters...
> }
>
> result = validate_identity();
> -
> if (result) {
> netdev_err(wlandev->netdev, "Incompatible firmware image.\n");
> - return 1;
> + goto out;
> }
>
> if (startaddr == 0x00000000) {
> netdev_err(wlandev->netdev,
> "Can't RAM download a Flash image!\n");
> - return 1;
> + result = 1;
> + goto out;
> }
>
> /* Make the image chunks */
> result = mkimage(fchunk, &nfchunks);
> if (result) {
> netdev_err(wlandev->netdev, "Failed to make image chunk.\n");
> - return 1;
> + goto free_chunks;
This works, but really mkimage() should clean up it's own allocations
on failure. Otherwise it is a layering violation.
The rest of the patch is fine.
regards,
dan carpenter
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