Re: [Outreachy kernel] [PATCH v2] staging: rtl8192u: Replace printk() with appropriate net_*macro_ratelimited()

[Julia Lawall <julia.lawall@lip6.fr>]

On Mon, 5 Mar 2018, Arushi Singhal wrote:

> Replace printk having a log level with the appropriate
> net_*macro_ratelimited.
> It's better to use actual device name as a prefix in error messages.

I asked several questions about the above two lines, which as far as I can
see haven't been answered. Please excuse me if I missed the answers, but I
would still like to know what they are.

Namely, why did you choose to change to rate limited output, and what does
the "device name as a prefix" comment mean?

julia

> Indentation is also changed, to fix the  checkpatch issue if line is not
> exceding 80 characters.
>
> Signed-off-by: Arushi Singhal <arushisinghal19971997@gmail.com>
> ---
> changes in v2
> *change the subject line, in v1 driver name was wrong.
>
>  .../rtl8192u/ieee80211/ieee80211_crypt_ccmp.c      | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
> index e6648f7..200fe5f 100644
> --- a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
> +++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
> @@ -73,7 +73,7 @@ static void *ieee80211_ccmp_init(int key_idx)
>
>  	priv->tfm = (void *)crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
>  	if (IS_ERR(priv->tfm)) {
> -		printk(KERN_DEBUG "ieee80211_crypt_ccmp: could not allocate crypto API aes\n");
> +		net_dbg_ratelimited("ieee80211_crypt_ccmp: could not allocate crypto API aes\n");
>  		priv->tfm = NULL;
>  		goto fail;
>  	}
> @@ -276,22 +276,22 @@ static int ieee80211_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
>  	keyidx = pos[3];
>  	if (!(keyidx & (1 << 5))) {
>  		if (net_ratelimit()) {
> -			printk(KERN_DEBUG "CCMP: received packet without ExtIV flag from %pM\n",
> -				hdr->addr2);
> +			net_dbg_ratelimited("CCMP: received packet without ExtIV flag from %pM\n",
> +					    hdr->addr2);
>  		}
>  		key->dot11RSNAStatsCCMPFormatErrors++;
>  		return -2;
>  	}
>  	keyidx >>= 6;
>  	if (key->key_idx != keyidx) {
> -		printk(KERN_DEBUG "CCMP: RX tkey->key_idx=%d frame keyidx=%d priv=%p\n",
> -			key->key_idx, keyidx, priv);
> +		net_dbg_ratelimited("CCMP: RX tkey->key_idx=%d frame keyidx=%d priv=%p\n",
> +				    key->key_idx, keyidx, priv);
>  		return -6;
>  	}
>  	if (!key->key_set) {
>  		if (net_ratelimit()) {
> -			printk(KERN_DEBUG "CCMP: received packet from %pM with keyid=%d that does not have a configured key\n",
> -				hdr->addr2, keyidx);
> +			net_dbg_ratelimited("CCMP: received packet from %pM with keyid=%d that does not have a configured key\n",
> +					    hdr->addr2, keyidx);
>  		}
>  		return -3;
>  	}
> @@ -306,8 +306,8 @@ static int ieee80211_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
>
>  	if (memcmp(pn, key->rx_pn, CCMP_PN_LEN) <= 0) {
>  		if (net_ratelimit()) {
> -			printk(KERN_DEBUG "CCMP: replay detected: STA=%pM previous PN %pm received PN %pm\n",
> -			       hdr->addr2, key->rx_pn, pn);
> +			net_dbg_ratelimited("CCMP: replay detected: STA=%pM previous PN %pm received PN %pm\n",
> +					    hdr->addr2, key->rx_pn, pn);
>  		}
>  		key->dot11RSNAStatsCCMPReplays++;
>  		return -4;
> @@ -341,8 +341,8 @@ static int ieee80211_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
>
>  		if (memcmp(mic, a, CCMP_MIC_LEN) != 0) {
>  			if (net_ratelimit()) {
> -				printk(KERN_DEBUG "CCMP: decrypt failed: STA=%pM\n",
> -					hdr->addr2);
> +				net_dbg_ratelimited("CCMP: decrypt failed: STA=%pM\n",
> +						    hdr->addr2);
>  			}
>  			key->dot11RSNAStatsCCMPDecryptErrors++;
>  			return -5;
> --
> 2.7.4
>
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