linux-kernel - Re: [PATCH v2] staging: rtl8192u: Replace printk() with appropriate net_*macro

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Date:   Tue, 6 Mar 2018 04:05:06 -0800
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Arushi Singhal <arushisinghal19971997@...il.com>
Cc:     devel@...verdev.osuosl.org, outreachy-kernel@...glegroups.com,
        linux-kernel@...r.kernel.org, Larry.Finger@...inger.net
Subject: Re: [PATCH v2] staging: rtl8192u: Replace printk() with appropriate
 net_*macro_ratelimited()

On Mon, Mar 05, 2018 at 01:02:56PM +0530, 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.
> Indentation is also changed, to fix the  checkpatch issue if line is not
> exceding 80 characters.
> 
> Signed-off-by: Arushi Singhal <arushisinghal19971997@...il.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");

Why would this need to be ratelimited at all?

Same for the other changes in this file.  Only use the _ratelimited()
calls if the message can be triggered a lot.

> @@ -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);

Also, "ratelimit" is already checked right above this, so that's a hint
you don't need to check it again :)

thanks,

greg k-h