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Date: Wed, 23 Mar 2016 14:54:48 -0700 From: Haiyang Zhang <haiyangz@...rosoft.com> To: davem@...emloft.net, netdev@...r.kernel.org Cc: haiyangz@...rosoft.com, kys@...rosoft.com, olaf@...fle.de, vkuznets@...hat.com, linux-kernel@...r.kernel.org, driverdev-devel@...uxdriverproject.org Subject: [PATCH net-next] hv_netvsc: Fix the order of num_sc_offered decrement Reorder the code in netvsc_sc_open(), so num_sc_offered is only decremented after vmbus_open() is called. This avoid pontential race of removing device before all channels are setup. Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com> Reviewed-by: K. Y. Srinivasan <kys@...rosoft.com> --- drivers/net/hyperv/rndis_filter.c | 12 ++++++------ 1 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c index d5a54da..c4e1e04 100644 --- a/drivers/net/hyperv/rndis_filter.c +++ b/drivers/net/hyperv/rndis_filter.c @@ -986,12 +986,6 @@ static void netvsc_sc_open(struct vmbus_channel *new_sc) nvscdev = hv_get_drvdata(new_sc->primary_channel->device_obj); - spin_lock_irqsave(&nvscdev->sc_lock, flags); - nvscdev->num_sc_offered--; - spin_unlock_irqrestore(&nvscdev->sc_lock, flags); - if (nvscdev->num_sc_offered == 0) - complete(&nvscdev->channel_init_wait); - if (chn_index >= nvscdev->num_chn) return; @@ -1004,6 +998,12 @@ static void netvsc_sc_open(struct vmbus_channel *new_sc) if (ret == 0) nvscdev->chn_table[chn_index] = new_sc; + + spin_lock_irqsave(&nvscdev->sc_lock, flags); + nvscdev->num_sc_offered--; + spin_unlock_irqrestore(&nvscdev->sc_lock, flags); + if (nvscdev->num_sc_offered == 0) + complete(&nvscdev->channel_init_wait); } int rndis_filter_device_add(struct hv_device *dev, -- 1.7.4.1
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