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author | Jiri Pirko <jpirko@redhat.com> | 2010-03-04 03:32:16 -0800 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2010-03-04 03:32:16 -0800 |
commit | 12c3400a84742f8bb0e4edc822e9ccba58781e0c (patch) | |
tree | 0d4d98975822024b6d7414739b6a88f83b553da4 | |
parent | 4c32531324b83672f100692354b680625bcd7fba (diff) | |
download | linux-stable-12c3400a84742f8bb0e4edc822e9ccba58781e0c.tar.gz linux-stable-12c3400a84742f8bb0e4edc822e9ccba58781e0c.tar.bz2 linux-stable-12c3400a84742f8bb0e4edc822e9ccba58781e0c.zip |
rndis_wlan: correct multicast_list handling V3
My previous patch (655ffee284dfcf9a24ac0343f3e5ee6db85b85c5) added locking in
a bad way. Because rndis_set_oid can sleep, there is need to prepare multicast
addresses into local buffer under netif_addr_lock first, then call
rndis_set_oid outside. This caused reorganizing of the whole function.
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Reported-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | drivers/net/wireless/rndis_wlan.c | 66 |
1 files changed, 41 insertions, 25 deletions
diff --git a/drivers/net/wireless/rndis_wlan.c b/drivers/net/wireless/rndis_wlan.c index 9f6d6bf06b8e..2887047069f2 100644 --- a/drivers/net/wireless/rndis_wlan.c +++ b/drivers/net/wireless/rndis_wlan.c @@ -1496,51 +1496,67 @@ static void set_multicast_list(struct usbnet *usbdev) { struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev); struct dev_mc_list *mclist; - __le32 filter; - int ret, i, size; - char *buf; + __le32 filter, basefilter; + int ret; + char *mc_addrs = NULL; + int mc_count; - filter = RNDIS_PACKET_TYPE_DIRECTED | RNDIS_PACKET_TYPE_BROADCAST; + basefilter = filter = RNDIS_PACKET_TYPE_DIRECTED | + RNDIS_PACKET_TYPE_BROADCAST; - netif_addr_lock_bh(usbdev->net); if (usbdev->net->flags & IFF_PROMISC) { filter |= RNDIS_PACKET_TYPE_PROMISCUOUS | RNDIS_PACKET_TYPE_ALL_LOCAL; - } else if (usbdev->net->flags & IFF_ALLMULTI || - netdev_mc_count(usbdev->net) > priv->multicast_size) { + } else if (usbdev->net->flags & IFF_ALLMULTI) { + filter |= RNDIS_PACKET_TYPE_ALL_MULTICAST; + } + + if (filter != basefilter) + goto set_filter; + + /* + * mc_list should be accessed holding the lock, so copy addresses to + * local buffer first. + */ + netif_addr_lock_bh(usbdev->net); + mc_count = netdev_mc_count(usbdev->net); + if (mc_count > priv->multicast_size) { filter |= RNDIS_PACKET_TYPE_ALL_MULTICAST; - } else if (!netdev_mc_empty(usbdev->net)) { - size = min(priv->multicast_size, netdev_mc_count(usbdev->net)); - buf = kmalloc(size * ETH_ALEN, GFP_KERNEL); - if (!buf) { + } else if (mc_count) { + int i = 0; + + mc_addrs = kmalloc(mc_count * ETH_ALEN, GFP_ATOMIC); + if (!mc_addrs) { netdev_warn(usbdev->net, "couldn't alloc %d bytes of memory\n", - size * ETH_ALEN); + mc_count * ETH_ALEN); netif_addr_unlock_bh(usbdev->net); return; } - i = 0; - netdev_for_each_mc_addr(mclist, usbdev->net) { - if (i == size) - break; - memcpy(buf + i++ * ETH_ALEN, mclist->dmi_addr, ETH_ALEN); - } + netdev_for_each_mc_addr(mclist, usbdev->net) + memcpy(mc_addrs + i++ * ETH_ALEN, + mclist->dmi_addr, ETH_ALEN); + } + netif_addr_unlock_bh(usbdev->net); - ret = rndis_set_oid(usbdev, OID_802_3_MULTICAST_LIST, buf, - i * ETH_ALEN); - if (ret == 0 && i > 0) + if (filter != basefilter) + goto set_filter; + + if (mc_count) { + ret = rndis_set_oid(usbdev, OID_802_3_MULTICAST_LIST, mc_addrs, + mc_count * ETH_ALEN); + kfree(mc_addrs); + if (ret == 0) filter |= RNDIS_PACKET_TYPE_MULTICAST; else filter |= RNDIS_PACKET_TYPE_ALL_MULTICAST; netdev_dbg(usbdev->net, "OID_802_3_MULTICAST_LIST(%d, max: %d) -> %d\n", - i, priv->multicast_size, ret); - - kfree(buf); + mc_count, priv->multicast_size, ret); } - netif_addr_unlock_bh(usbdev->net); +set_filter: ret = rndis_set_oid(usbdev, OID_GEN_CURRENT_PACKET_FILTER, &filter, sizeof(filter)); if (ret < 0) { |