Hi Johannes,
On Thu, Jul 12, 2012 at 6:54 PM, Johannes Berg
<johannes@xxxxxxxxxxxxxxxx> wrote:
> This should fix it, can you confirm? I did tracing for various cases and
> it looks correct to me.
i just applied this one and the other patch which solve lockdep
complaint of yours.
seems monitor iface working without warning. will be using it for some
more time,
will report if i see any issues
>
> johannes
>
>
>
> From: Johannes Berg <johannes.berg@xxxxxxxxx>
> Date: Thu, 12 Jul 2012 15:19:36 +0200
> Subject: [PATCH] cfg80211: fix set_monitor_enabled
>
> When bringing monitor mode up with a driver using the
> mac80211 virtual monitor interface this resulted in a
> warning because cfg80211_update_iface_num() is called
> from PRE_UP, which causes it to call mac80211 and the
> low-level driver before the device is started.
>
> For the case that another interface is added and the
> monitor interface should be removed, this is correct.
> However, in the case where a monitor interface is
> added, it's not correct as the above.
>
> To fix this, we need to split up the cases and track
> whether or not "only monitor" is active so that the
> code can correctly call into the driver when things
> change.
>
> Reported-by: Mohammed Shafi <shafi.wireless@xxxxxxxxx>
> Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
> ---
> net/wireless/core.c | 62 ++++++++++++++++++++++++++++++++++++++-------------
> net/wireless/core.h | 10 ++++++++-
> net/wireless/util.c | 8 +++++--
> 3 files changed, 61 insertions(+), 19 deletions(-)
>
> diff --git a/net/wireless/core.c b/net/wireless/core.c
> index 0557bb1..b63c450 100644
> --- a/net/wireless/core.c
> +++ b/net/wireless/core.c
> @@ -766,30 +766,56 @@ static void cfg80211_init_mon_chan(struct cfg80211_registered_device *rdev)
> }
>
> void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
> - enum nl80211_iftype iftype, int num)
> + enum nl80211_iftype iftype,
> + enum cfg80211_iface_action action)
> {
> - bool has_monitors_only_old = cfg80211_has_monitors_only(rdev);
> - bool has_monitors_only_new;
> + bool monitors_only;
> + int num;
>
> ASSERT_RTNL();
>
> + switch (action) {
> + case CFG80211_IFACE_DOWN:
> + num = -1;
> + break;
> + case CFG80211_IFACE_PRE_UP:
> + num = 1;
> + break;
> + case CFG80211_IFACE_UP:
> + num = 0;
> + break;
> + default:
> + WARN_ON(1);
> + return;
> + }
> +
> rdev->num_running_ifaces += num;
> if (iftype == NL80211_IFTYPE_MONITOR)
> rdev->num_running_monitor_ifaces += num;
>
> - has_monitors_only_new = cfg80211_has_monitors_only(rdev);
> - if (has_monitors_only_new != has_monitors_only_old) {
> + monitors_only = cfg80211_has_monitors_only(rdev);
> +
> + if (monitors_only && rdev->monitor_only_enabled)
> + return;
> +
> + if (!monitors_only && !rdev->monitor_only_enabled)
> + return;
> +
> + if (monitors_only) {
> + /* Do it in CFG80211_IFACE_UP instead */
> + if (action == CFG80211_IFACE_PRE_UP)
> + return;
> if (rdev->ops->set_monitor_enabled)
> - rdev->ops->set_monitor_enabled(&rdev->wiphy,
> - has_monitors_only_new);
> -
> - if (!has_monitors_only_new) {
> - rdev->monitor_channel = NULL;
> - rdev->monitor_channel_type = NL80211_CHAN_NO_HT;
> - } else {
> - cfg80211_init_mon_chan(rdev);
> - }
> + rdev->ops->set_monitor_enabled(&rdev->wiphy, true);
> + cfg80211_init_mon_chan(rdev);
> + } else {
> + rdev->monitor_channel = NULL;
> + rdev->monitor_channel_type = NL80211_CHAN_NO_HT;
> + if (rdev->ops->set_monitor_enabled)
> + rdev->ops->set_monitor_enabled(&rdev->wiphy, false);
> }
> +
> + rdev->monitor_only_enabled = monitors_only;
> }
>
> static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
> @@ -895,7 +921,8 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
> wdev->beacon_interval = 0;
> break;
> case NETDEV_DOWN:
> - cfg80211_update_iface_num(rdev, wdev->iftype, -1);
> + cfg80211_update_iface_num(rdev, wdev->iftype,
> + CFG80211_IFACE_DOWN);
> dev_hold(dev);
> queue_work(cfg80211_wq, &wdev->cleanup_work);
> break;
> @@ -912,6 +939,8 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
> mutex_unlock(&rdev->devlist_mtx);
> dev_put(dev);
> }
> + cfg80211_update_iface_num(rdev, wdev->iftype,
> + CFG80211_IFACE_UP);
> cfg80211_lock_rdev(rdev);
> mutex_lock(&rdev->devlist_mtx);
> wdev_lock(wdev);
> @@ -1006,7 +1035,8 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
> mutex_unlock(&rdev->devlist_mtx);
> if (ret)
> return notifier_from_errno(ret);
> - cfg80211_update_iface_num(rdev, wdev->iftype, 1);
> + cfg80211_update_iface_num(rdev, wdev->iftype,
> + CFG80211_IFACE_PRE_UP);
> break;
> }
>
> diff --git a/net/wireless/core.h b/net/wireless/core.h
> index bac97da..b2b1db3 100644
> --- a/net/wireless/core.h
> +++ b/net/wireless/core.h
> @@ -60,6 +60,7 @@ struct cfg80211_registered_device {
> /* protected by RTNL only */
> int num_running_ifaces;
> int num_running_monitor_ifaces;
> + bool monitor_only_enabled;
>
> struct ieee80211_channel *monitor_channel;
> enum nl80211_channel_type monitor_channel_type;
> @@ -480,8 +481,15 @@ int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
> int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
> u32 beacon_int);
>
> +enum cfg80211_iface_action {
> + CFG80211_IFACE_DOWN,
> + CFG80211_IFACE_PRE_UP,
> + CFG80211_IFACE_UP,
> +};
> +
> void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
> - enum nl80211_iftype iftype, int num);
> + enum nl80211_iftype iftype,
> + enum cfg80211_iface_action action);
>
> #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
>
> diff --git a/net/wireless/util.c b/net/wireless/util.c
> index 26f8cd3..37e9a3f 100644
> --- a/net/wireless/util.c
> +++ b/net/wireless/util.c
> @@ -893,8 +893,12 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
> }
>
> if (!err && ntype != otype && netif_running(dev)) {
> - cfg80211_update_iface_num(rdev, ntype, 1);
> - cfg80211_update_iface_num(rdev, otype, -1);
> + cfg80211_update_iface_num(rdev, ntype,
> + CFG80211_IFACE_DOWN);
> + cfg80211_update_iface_num(rdev, ntype,
> + CFG80211_IFACE_PRE_UP);
> + cfg80211_update_iface_num(rdev, otype,
> + CFG80211_IFACE_UP);
> }
>
> return err;
> --
> 1.7.10.4
>
>
>
--
thanks,
shafi
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
