linux-kernel - Re: [PATCH]hostap:hostap_ioctl.c Fix variable 'ret' set but not used

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Message-ID: <AANLkTimgcFwc7FX72u5Z32DSVkL3xTEC=3vTBxHk9X6H@mail.gmail.com>
Date:	Mon, 2 Aug 2010 17:16:33 -0700
From:	"Luis R. Rodriguez" <mcgrof@...il.com>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, j@...fi, linville@...driver.com
Subject: Re: [PATCH]hostap:hostap_ioctl.c Fix variable 'ret' set but not used

On Mon, Aug 2, 2010 at 5:15 PM, Luis R. Rodriguez <mcgrof@...il.com> wrote:
> On Mon, Aug 2, 2010 at 5:04 PM, Justin P. Mattock
> <justinmattock@...il.com> wrote:
>> The below patch fixes a warning message generated by GCC:
>>  CC [M]  drivers/net/wireless/hostap/hostap_ioctl.o
>> drivers/net/wireless/hostap/hostap_ioctl.c: In function 'prism2_request_scan':
>> drivers/net/wireless/hostap/hostap_ioctl.c:1666:6: warning: variable 'ret' set but not used
>>
>> Keep in mind Im not sure if this is the right fix for this, so please
>> feedback is appreciated.
>>
>> Signed-off-by: Justin P. Mattock <justinmattock@...il.com>
>>
>> ---
>>  drivers/net/wireless/hostap/hostap_ioctl.c |    3 +--
>>  1 files changed, 1 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/wireless/hostap/hostap_ioctl.c b/drivers/net/wireless/hostap/hostap_ioctl.c
>> index a85e43a..27d462f 100644
>> --- a/drivers/net/wireless/hostap/hostap_ioctl.c
>> +++ b/drivers/net/wireless/hostap/hostap_ioctl.c
>> @@ -1663,7 +1663,6 @@ static int prism2_request_scan(struct net_device *dev)
>>        struct hostap_interface *iface;
>>        local_info_t *local;
>>        struct hfa384x_scan_request scan_req;
>> -       int ret = 0;
>>
>>        iface = netdev_priv(dev);
>>        local = iface->local;
>> @@ -1689,7 +1688,7 @@ static int prism2_request_scan(struct net_device *dev)
>>        if (local->func->set_rid(dev, HFA384X_RID_SCANREQUEST, &scan_req,
>>                                 sizeof(scan_req))) {
>>                printk(KERN_DEBUG "SCANREQUEST failed\n");
>> -               ret = -EINVAL;
>> +               return -EINVAL;
>>        }
>>
>>        if (!local->host_roaming)
>
> NACK please read the code instead of just patching blindly to cure a
> compile issue. For example read this big block:
>
>
>        /* FIX:
>         * It seems to be enough to set roaming mode for a short moment to
>         * host-based and then setup scanrequest data and return the mode to
>         * firmware-based.
>         *
>         * Master mode would need to drop to Managed mode for a short while
>         * to make scanning work.. Or sweep through the different channels and
>         * use passive scan based on beacons. */
>
> So.. it seems to me you likely want to flip back to
> HFA384X_ROAMING_FIRMWARE *after* you've tried to issue the
> HFA384X_RID_SCANREQUEST, even if it has failed. So the compile fix
> should require just changing the last return statement of the function
> to return ret value.

And for 802.11 there is no need to cc netdev and lkml. Just use linux-wireless.

  Luis
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