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https://github.com/edk2-porting/linux-next.git
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[PATCH] zd1211rw: Call ieee80211_rx in tasklet
The driver called ieee80211_rx in hardware interrupt context. This has been against the intention of the ieee80211_rx function. It caused a bug in the crypto routines used by WPA. This patch calls ieee80211_rx in a tasklet. Signed-off-by: Ulrich Kunitz <kune@deine-taler.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ulrich Kunitz
John W. Linville
parent
e25db641c0
commit
4d1feabcbf
@ -41,6 +41,8 @@ static void housekeeping_disable(struct zd_mac *mac);
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static void set_multicast_hash_handler(struct work_struct *work);
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static void do_rx(unsigned long mac_ptr);
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int zd_mac_init(struct zd_mac *mac,
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struct net_device *netdev,
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struct usb_interface *intf)
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@ -53,6 +55,10 @@ int zd_mac_init(struct zd_mac *mac,
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INIT_DELAYED_WORK(&mac->set_rts_cts_work, set_rts_cts_work);
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INIT_DELAYED_WORK(&mac->set_basic_rates_work, set_basic_rates_work);
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skb_queue_head_init(&mac->rx_queue);
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tasklet_init(&mac->rx_tasklet, do_rx, (unsigned long)mac);
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tasklet_disable(&mac->rx_tasklet);
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ieee_init(ieee);
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softmac_init(ieee80211_priv(netdev));
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zd_chip_init(&mac->chip, netdev, intf);
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@ -140,6 +146,8 @@ out:
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void zd_mac_clear(struct zd_mac *mac)
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{
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flush_workqueue(zd_workqueue);
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skb_queue_purge(&mac->rx_queue);
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tasklet_kill(&mac->rx_tasklet);
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zd_chip_clear(&mac->chip);
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ZD_ASSERT(!spin_is_locked(&mac->lock));
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ZD_MEMCLEAR(mac, sizeof(struct zd_mac));
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@ -168,6 +176,8 @@ int zd_mac_open(struct net_device *netdev)
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struct zd_chip *chip = &mac->chip;
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int r;
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tasklet_enable(&mac->rx_tasklet);
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r = zd_chip_enable_int(chip);
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if (r < 0)
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goto out;
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@ -218,6 +228,8 @@ int zd_mac_stop(struct net_device *netdev)
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*/
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zd_chip_disable_rx(chip);
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skb_queue_purge(&mac->rx_queue);
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tasklet_disable(&mac->rx_tasklet);
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housekeeping_disable(mac);
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ieee80211softmac_stop(netdev);
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@ -470,13 +482,13 @@ static void bssinfo_change(struct net_device *netdev, u32 changes)
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if (changes & IEEE80211SOFTMAC_BSSINFOCHG_RATES) {
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/* Set RTS rate to highest available basic rate */
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u8 rate = ieee80211softmac_highest_supported_rate(softmac,
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u8 hi_rate = ieee80211softmac_highest_supported_rate(softmac,
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&bssinfo->supported_rates, 1);
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rate = rate_to_zd_rate(rate);
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hi_rate = rate_to_zd_rate(hi_rate);
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spin_lock_irqsave(&mac->lock, flags);
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if (rate != mac->rts_rate) {
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mac->rts_rate = rate;
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if (hi_rate != mac->rts_rate) {
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mac->rts_rate = hi_rate;
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need_set_rts_cts = 1;
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}
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spin_unlock_irqrestore(&mac->lock, flags);
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@ -1072,43 +1084,75 @@ static int fill_rx_stats(struct ieee80211_rx_stats *stats,
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return 0;
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}
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int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length)
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static void zd_mac_rx(struct zd_mac *mac, struct sk_buff *skb)
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{
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int r;
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struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
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struct ieee80211_rx_stats stats;
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const struct rx_status *status;
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struct sk_buff *skb;
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if (length < ZD_PLCP_HEADER_SIZE + IEEE80211_1ADDR_LEN +
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IEEE80211_FCS_LEN + sizeof(struct rx_status))
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return -EINVAL;
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if (skb->len < ZD_PLCP_HEADER_SIZE + IEEE80211_1ADDR_LEN +
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IEEE80211_FCS_LEN + sizeof(struct rx_status))
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{
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dev_dbg_f(zd_mac_dev(mac), "Packet with length %u to small.\n",
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skb->len);
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goto free_skb;
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}
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r = fill_rx_stats(&stats, &status, mac, buffer, length);
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if (r)
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return r;
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r = fill_rx_stats(&stats, &status, mac, skb->data, skb->len);
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if (r) {
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/* Only packets with rx errors are included here. */
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goto free_skb;
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}
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length -= ZD_PLCP_HEADER_SIZE+IEEE80211_FCS_LEN+
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sizeof(struct rx_status);
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buffer += ZD_PLCP_HEADER_SIZE;
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__skb_pull(skb, ZD_PLCP_HEADER_SIZE);
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__skb_trim(skb, skb->len -
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(IEEE80211_FCS_LEN + sizeof(struct rx_status)));
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update_qual_rssi(mac, buffer, length, stats.signal, stats.rssi);
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update_qual_rssi(mac, skb->data, skb->len, stats.signal,
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status->signal_strength);
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r = filter_rx(ieee, buffer, length, &stats);
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if (r <= 0)
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return r;
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r = filter_rx(ieee, skb->data, skb->len, &stats);
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if (r <= 0) {
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if (r < 0)
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dev_dbg_f(zd_mac_dev(mac), "Error in packet.\n");
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goto free_skb;
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}
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skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
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if (!skb)
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return -ENOMEM;
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if (ieee->iw_mode == IW_MODE_MONITOR)
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fill_rt_header(skb_put(skb, sizeof(struct zd_rt_hdr)), mac,
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fill_rt_header(skb_push(skb, sizeof(struct zd_rt_hdr)), mac,
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&stats, status);
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memcpy(skb_put(skb, length), buffer, length);
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r = ieee80211_rx(ieee, skb, &stats);
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if (!r)
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dev_kfree_skb_any(skb);
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if (r)
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return;
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free_skb:
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/* We are always in a soft irq. */
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dev_kfree_skb(skb);
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}
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static void do_rx(unsigned long mac_ptr)
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{
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struct zd_mac *mac = (struct zd_mac *)mac_ptr;
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struct sk_buff *skb;
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while ((skb = skb_dequeue(&mac->rx_queue)) != NULL)
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zd_mac_rx(mac, skb);
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}
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int zd_mac_rx_irq(struct zd_mac *mac, const u8 *buffer, unsigned int length)
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{
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struct sk_buff *skb;
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skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
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if (!skb) {
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dev_warn(zd_mac_dev(mac), "Could not allocate skb.\n");
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return -ENOMEM;
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}
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skb_reserve(skb, sizeof(struct zd_rt_hdr));
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memcpy(__skb_put(skb, length), buffer, length);
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skb_queue_tail(&mac->rx_queue, skb);
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tasklet_schedule(&mac->rx_tasklet);
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return 0;
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}
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@ -138,6 +138,9 @@ struct zd_mac {
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struct delayed_work set_rts_cts_work;
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struct delayed_work set_basic_rates_work;
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struct tasklet_struct rx_tasklet;
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struct sk_buff_head rx_queue;
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unsigned int stats_count;
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u8 qual_buffer[ZD_MAC_STATS_BUFFER_SIZE];
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u8 rssi_buffer[ZD_MAC_STATS_BUFFER_SIZE];
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@ -193,7 +196,7 @@ int zd_mac_stop(struct net_device *netdev);
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int zd_mac_set_mac_address(struct net_device *dev, void *p);
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void zd_mac_set_multicast_list(struct net_device *netdev);
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int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length);
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int zd_mac_rx_irq(struct zd_mac *mac, const u8 *buffer, unsigned int length);
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int zd_mac_set_regdomain(struct zd_mac *zd_mac, u8 regdomain);
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u8 zd_mac_get_regdomain(struct zd_mac *zd_mac);
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@ -598,13 +598,13 @@ static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
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n = l+k;
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if (n > length)
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return;
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zd_mac_rx(mac, buffer+l, k);
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zd_mac_rx_irq(mac, buffer+l, k);
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if (i >= 2)
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return;
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l = (n+3) & ~3;
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}
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} else {
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zd_mac_rx(mac, buffer, length);
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zd_mac_rx_irq(mac, buffer, length);
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}
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}
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