RE: [PATCH net 3/4] hv_netvsc: protect module refcount by checking net_device_ctx->vf_netdev
From: Haiyang Zhang <haiyangz@microsoft.com>
Date: 2016-08-11 16:09:58
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-----Original Message----- From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com] Sent: Thursday, August 11, 2016 6:59 AM To: netdev@vger.kernel.org Cc: devel@linuxdriverproject.org; linux-kernel@vger.kernel.org; Haiyang Zhang [off-list ref]; KY Srinivasan [off-list ref] Subject: [PATCH net 3/4] hv_netvsc: protect module refcount by checking net_device_ctx->vf_netdev We're not guaranteed to see NETDEV_REGISTER/NETDEV_UNREGISTER notifications only once per VF but we increase/decrease module refcount unconditionally. Check vf_netdev to make sure we don't take/release it twice. We presume that only one VF per netvsc device may exist. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Acked-by: Haiyang Zhang <haiyangz@microsoft.com>