From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: Re: [[PATCH stable <3.12]] xen-netback: fix refcnt unbalance for 3.11 and earlier versions Date: Sat, 30 Nov 2013 20:48:35 -0800 Message-ID: <20131201044835.GB19516@kroah.com> References: <1385642889-11513-1-git-send-email-wei.liu2@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: xen-devel@lists.xen.org, netdev@vger.kernel.org, stable@vger.kernel.org, tomasz.wroblewski@citrix.com, Ian Campbell , Konrad Wilk , David Vrabel To: Wei Liu Return-path: Content-Disposition: inline In-Reply-To: <1385642889-11513-1-git-send-email-wei.liu2@citrix.com> Sender: stable-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Thu, Nov 28, 2013 at 12:48:09PM +0000, Wei Liu wrote: > With the introduction of "xen-netback: Don't destroy the netdev until > the vif is shut down" (upstream commit id 279f438e36), vif disconnect > and free are separated. However in the backported verion reference > counting code was not correctly modified, and the reset of vif->tx_irq > was lost. If frontend goes through vif life cycle more than once the > reference counting is skewed. > > This patch adds back the missing tx_irq reset line. It also moves > several lines of the reference counting code to vif_free, so the moved > code corresponds to the counterpart in vif_alloc, thus the reference > counting is balanced. > > 3.12 and onward versions are not affected by this bug, because reference > counting code was removed due to the introduction of 1:1 model. > > This pacth should be backported to all stable verions which are lower > than 3.12 and have 279f438e36. What stable versions are those? 279f438e36 showed up in 3.12-rc2, and was not marked for stable inclusion, so what kernel would end up needing this patch? confused, greg k-h