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[149.6.153.186]) by smtp.gmail.com with ESMTPSA id o64sm15105963wmo.47.2019.02.18.06.25.30 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 18 Feb 2019 06:25:30 -0800 (PST) Date: Mon, 18 Feb 2019 15:25:28 +0100 From: Lorenzo Bianconi To: Stanislaw Gruszka Cc: Stefan Wahren , Alan Stern , Felix Fietkau , Doug Anderson , Minas Harutyunyan , USB list , linux-wireless Subject: Re: [BUG] mt76x0u: Probing issues on Raspberry Pi 3 B+ Message-ID: <20190218142527.GA9283@localhost.localdomain> References: <20190212093035.GB12906@redhat.com> <404607590.373282.1550126997144@email.ionos.de> <20190214092530.GA17273@redhat.com> <878a7160-2e91-d057-6d27-c6b9d85f700e@i2se.com> <20190215071226.GA2372@redhat.com> <1411983628.668277.1550315118443@email.ionos.de> <20190216140739.GA2236@redhat.com> <2009016263.528260.1550344627996@email.ionos.de> <20190218135247.GA9602@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190218135247.GA9602@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org > commit 0d9813319b40399a0d8fd761d2fcfedee5701487 > Author: Lorenzo Bianconi > Date: Fri Sep 7 23:13:12 2018 +0200 [...] > diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c > index 062614ad0d51..08425b1d2c30 100644 > --- a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c > +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c > @@ -550,21 +550,33 @@ void mt76x02_sta_rate_tbl_update(struct ieee80211_hw *hw, > } > EXPORT_SYMBOL_GPL(mt76x02_sta_rate_tbl_update); > > -int mt76x02_insert_hdr_pad(struct sk_buff *skb) > +void mt76x02_align_skb(struct sk_buff *skb) > { > - int len = ieee80211_get_hdrlen_from_skb(skb); > + int align = ((unsigned long) skb->data) & 3; > + int hdrlen, skblen; > > - if (len % 4 == 0) > - return 0; > + hdrlen = ieee80211_get_hdrlen_from_skb(skb); > + WARN_ON_ONCE(align == 0 && (hdrlen & 3)); > + > + if (align == 0) > + return; Hi Stanislaw, is it possible that skb->data is 4 byte aligned but hdrlen is not? (e.g 4addr data frames, not qos)? > > - skb_push(skb, 2); > - memmove(skb->data, skb->data + 2, len); > + if (hdrlen & 3) { > + /* Align frame and add 2 bytes pad after header. */ > + skb_push(skb, 2); > + memmove(skb->data, skb->data + 2, hdrlen); > > - skb->data[len] = 0; > - skb->data[len + 1] = 0; > - return 2; > + skb->data[hdrlen] = 0; > + skb->data[hdrlen + 1] = 0; > + } else { > + /* Only for probe request frames. */ are you sure this is true *only* for probe requests? this could hit performances and it is used even in pci code Regards, Lorenzo > + skblen = skb->len; > + skb_push(skb, 2); > + memmove(skb->data, skb->data + 2, skblen); > + skb_trim(skb, skblen); > + } > } > -EXPORT_SYMBOL_GPL(mt76x02_insert_hdr_pad); > +EXPORT_SYMBOL_GPL(mt76x02_align_skb); > > void mt76x02_remove_hdr_pad(struct sk_buff *skb, int len) > { > -- > 2.7.5 >