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mac802154: tx: don't allow if down while sync tx

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This patch holds rtnl lock while sync xmit inside of workqueue.
Otherwise we could down the interface while worker xmit handling.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2014-10-26 09:37:09 +01:00 • committed by Marcel Holtmann
parent ed0a5dce0c
commit 6001d5223d
1 changed files with 22 additions and 9 deletions
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25
net/mac802154/tx.c
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@ -21,6 +21,7 @@
#include <linux/if_arp.h> #include <linux/if_arp.h>
#include <linux/crc-ccitt.h> #include <linux/crc-ccitt.h>
#include <net/rtnetlink.h>
#include <net/ieee802154_netdev.h> #include <net/ieee802154_netdev.h>
#include <net/mac802154.h> #include <net/mac802154.h>
#include <net/cfg802154.h> #include <net/cfg802154.h>
@ -50,16 +51,28 @@ static void mac802154_xmit_worker(struct work_struct *work)
struct sk_buff *skb = cb->skb; struct sk_buff *skb = cb->skb;
int res; int res;
rtnl_lock();
/* check if ifdown occurred while schedule */
if (!netif_running(skb->dev))
goto err_tx;
res = local->ops->xmit_sync(&local->hw, skb); res = local->ops->xmit_sync(&local->hw, skb);
if (res) { if (res)
pr_debug("transmission failed\n"); goto err_tx;
ieee802154_xmit_complete(&local->hw, skb);
rtnl_unlock();
return;
err_tx:
/* Restart the netif queue on each sub_if_data object. */ /* Restart the netif queue on each sub_if_data object. */
ieee802154_wake_queue(&local->hw); ieee802154_wake_queue(&local->hw);
rtnl_unlock();
kfree_skb(skb); kfree_skb(skb);
} else { pr_debug("transmission failed\n");
/* Restart the netif queue on each sub_if_data object. */
ieee802154_xmit_complete(&local->hw, skb);
}
} }
static netdev_tx_t static netdev_tx_t