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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2023-11-27 15:24:20 +0300
committerJakub Kicinski <kuba@kernel.org>2023-11-29 06:54:24 +0300
commit9870257a0a338cd8d6c1cddab74e703f490f6779 (patch)
treec34e9fbd0bd2e0ab83d3d118e0afc92cfd83e16a /drivers
parent91d3d149978ba7b238198dd80e4b823756aa7cfa (diff)
downloadlinux-9870257a0a338cd8d6c1cddab74e703f490f6779.tar.xz
ravb: Fix races between ravb_tx_timeout_work() and net related ops
Fix races between ravb_tx_timeout_work() and functions of net_device_ops and ethtool_ops by using rtnl_trylock() and rtnl_unlock(). Note that since ravb_close() is under the rtnl lock and calls cancel_work_sync(), ravb_tx_timeout_work() should calls rtnl_trylock(). Otherwise, a deadlock may happen in ravb_tx_timeout_work() like below: CPU0 CPU1 ravb_tx_timeout() schedule_work() ... __dev_close_many() // Under rtnl lock ravb_close() cancel_work_sync() // Waiting ravb_tx_timeout_work() rtnl_lock() // This is possible to cause a deadlock If rtnl_trylock() fails, rescheduling the work with sleep for 1 msec. Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru> Link: https://lore.kernel.org/r/20231127122420.3706751-1-yoshihiro.shimoda.uh@renesas.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/renesas/ravb_main.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index c70cff80cc99..7c007ecd3ff6 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1874,6 +1874,12 @@ static void ravb_tx_timeout_work(struct work_struct *work)
struct net_device *ndev = priv->ndev;
int error;
+ if (!rtnl_trylock()) {
+ usleep_range(1000, 2000);
+ schedule_work(&priv->work);
+ return;
+ }
+
netif_tx_stop_all_queues(ndev);
/* Stop PTP Clock driver */
@@ -1907,7 +1913,7 @@ static void ravb_tx_timeout_work(struct work_struct *work)
*/
netdev_err(ndev, "%s: ravb_dmac_init() failed, error %d\n",
__func__, error);
- return;
+ goto out_unlock;
}
ravb_emac_init(ndev);
@@ -1917,6 +1923,9 @@ out:
ravb_ptp_init(ndev, priv->pdev);
netif_tx_start_all_queues(ndev);
+
+out_unlock:
+ rtnl_unlock();
}
/* Packet transmit function for Ethernet AVB */