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Date: Tue, 6 Mar 2018 18:08:28 +0100 (CET)
From: Julia Lawall <julia.lawall@...6.fr>
To: Arushi Singhal <arushisinghal19971997@...il.com>
cc: Greg KH <gregkh@...uxfoundation.org>,
driverdevel <devel@...verdev.osuosl.org>,
LKML <linux-kernel@...r.kernel.org>, Larry.Finger@...inger.net,
outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH v2] staging: rtl8192u: Replace printk()
with appropriate net_*macro_ratelimited()
On Tue, 6 Mar 2018, Arushi Singhal wrote:
>
>
> On Mon, Mar 5, 2018 at 1:07 PM, Julia Lawall <julia.lawall@...6.fr> wrote:
>
>
> 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.
>
>
> Hi Julia
> Sorry, I missed your above two question on my last patch and only saw the
> suggestions :(.
>
> -Why did I choose this function?
>
> Here we are using printk() which is the raw way to print something and it is
> always preferred to use dev_*macro() and netdev_*macro() because of the
> benefits they provide like dynamic debugging interface.
>
> And as we are using network subsystem so, netdev_*macro() or
> net_*ratelimited() can be used to standardized the output within the network
> subsystem.
>
>
>
> Namely, why did you choose to change to rate limited output, and
> what does
> the "device name as a prefix" comment mean?
>
>
> Yes your point is correct, as before function used is printk(), so changing
> it to ratelimit is not a good idea. So here I should have preferred changing
> it to netdev_*macro().
>
> As every kernel subsystem has its own printk format like net_* for network s
> ubsystem. And it is preferred to use them to standardize the format of the o
> utput within the subsystem.
Sure, but I don't think the ratelimited function does that. At least, it
doesn't seem to take any arguments that will help it with that.
julia
> Best
> Arushi
>
> julia
>
> > 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");
> > 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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