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QW5G6BKkLTrmLzc6AOD8DfHkpkyUphL9PSgberZ8hXIep400rdpOCylA /rS07QvhZAJRHrn2lvF6MBOevfwGOFtv7lVTl559Gi6hW8XaLRkB4JHtiamkLB3RY4pGTCyHEG3 UzQEO6wpJRQdHihGwKpscC5DV1Se5YlldA0POS1JtawJSSsDgSQZyESFXAljfJHDdhWbn1ZL4HI V+hS/jtcZTkhkQFUsTs/uAbQfk04oBI9QFQ7SSeAGdJZ3Knh6hzPMyzZ3J7JUjRiu1AuxJTN60m 7hcW9khP+TN275v+89ftuJwrFEhTbew1twePJJB3QfwsVk0UbsIoUKaF27lxZUC/k0gvy31iH+B jKqL2DZzikYmYghvcmv2pCv7GLPqFCzVDIGCo+v7R3cMsB/kqO72L/4BQw03A8tIE07yajnpBFK 2p7jqi6KAQfLsnhLrKWSt4DmvbhpicKLmK2TeKmsPn5C6nWpTnqg/VrSZEiM= X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--3.665300-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.6.1012-25632.006 X-MDID: 1598700204-nrjgVtbNETSk Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] net/virtio: fix wrong variable assignment in helper macro X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" On 8/14/20 12:21 PM, Vipul Ashri wrote: > Inside Macro ASSIGN_UNLESS_EQUAL(var, val), assignment to var is always > failing as assignment done using var_ having local scope only. > This leads to TX packets not going out and found broken due to cleanup > malfunctioning. This patch fixes the wrong variable assignment. > > Fixes: 57f90f894588 ("net/virtio: reuse packed ring functions") > Cc: stable@dpdk.org > > Signed-off-by: Vipul Ashri > --- > drivers/net/virtio/virtqueue.h | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h > index 105a9c00c..20c95471e 100644 > --- a/drivers/net/virtio/virtqueue.h > +++ b/drivers/net/virtio/virtqueue.h > @@ -607,10 +607,8 @@ virtqueue_notify(struct virtqueue *vq) > > /* avoid write operation when necessary, to lessen cache issues */ > #define ASSIGN_UNLESS_EQUAL(var, val) do { \ > - typeof(var) var_ = (var); \ > - typeof(val) val_ = (val); \ > - if ((var_) != (val_)) \ > - (var_) = (val_); \ > + if ((var) != (val)) \ > + (var) = (val); \ Good catch. As I understand the old code tries to avoid processing of var and val expressions twice. It looks it could be kept for val at least. Just keep if condition as in old code and fix the last line above:     (var) = val_; Since var_ and val_are local variables there is no necessity to enclose it in parenthesis (but does not harm if done). var_ may be really removed since since resulting code will use it only once.