When netvsc device is removed during mtu change or channels setup we get
into troubles as both paths are trying to remove the device. Synchronize
them with start_remove flag and rtnl lock.
Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
---
drivers/net/hyperv/netvsc_drv.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 393403a..71b9125 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -707,7 +707,7 @@ static int netvsc_set_channels(struct net_device *net,
int ret = 0;
bool recovering = false;
- if (!nvdev || nvdev->destroy)
+ if (net_device_ctx->start_remove || !nvdev || nvdev->destroy)
return -ENODEV;
num_chn = nvdev->num_chn;
@@ -855,7 +855,7 @@ static int netvsc_change_mtu(struct net_device *ndev, int
mtu)
u32 num_chn;
int ret = 0;
- if (nvdev == NULL || nvdev->destroy)
+ if (ndevctx->start_remove || !nvdev || nvdev->destroy)
return -ENODEV;
if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
@@ -1206,7 +1206,12 @@ static int netvsc_remove(struct hv_device *dev)
ndev_ctx = netdev_priv(net);
net_device = ndev_ctx->nvdev;
+ /* Avoid racing with netvsc_change_mtu()/netvsc_set_channels()
+ * removing the device.
+ */
+ rtnl_lock();
ndev_ctx->start_remove = true;
+ rtnl_unlock();
cancel_delayed_work_sync(&ndev_ctx->dwork);
cancel_work_sync(&ndev_ctx->work);
--
2.5.5
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