Search Linux Wireless

Re: [PATCH 6/9] drivers/net/wireless/iwlwifi/iwl-4965.c: Correct use of ! and &

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



* Julia Lawall <julia@xxxxxxx> wrote:

> From: Julia Lawall <julia@xxxxxxx>
> 
> In commit e6bafba5b4765a5a252f1b8d31cbf6d2459da337, a bug was fixed 
> that involved converting !x & y to !(x & y).  The code below shows the 
> same pattern, and thus should perhaps be fixed in the same way.

>  	if (sta_ht_inf) {
>  		if ((!sta_ht_inf->ht_supported) ||
> -		   (!sta_ht_inf->cap & IEEE80211_HT_CAP_SUP_WIDTH))
> +		   (!(sta_ht_inf->cap & IEEE80211_HT_CAP_SUP_WIDTH)))
>  			return 0;

i'm wondering, could Sparse be extended to check for such patterns? 

People are regularly running "make C=1" and are sending fixes to make 
entire subsystems sparse-warning-free, so Sparse is a nice mechanism 
that works and it keeps code clean in the long run.

I dont think the "!X & Y" pattern is ever used legitimately [and even if 
it were used legitimately, it's easy to avoid the sparse false positive 
- while in the buggy case we have a clear bug].

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Host AP]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Linux Kernel]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]
  Powered by Linux