]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/commitdiff
xen/netback: fix spurious event detection for common event case
authorJuergen Gross <jgross@suse.com>
Thu, 11 Feb 2021 10:16:12 +0000 (11:16 +0100)
committerKleber Sacilotto de Souza <kleber.souza@canonical.com>
Wed, 14 Apr 2021 16:31:23 +0000 (18:31 +0200)
BugLink: https://bugs.launchpad.net/bugs/1918974
[ Upstream commit a3daf3d39132b405781be8d9ede0c449b244b64e ]

In case of a common event for rx and tx queue the event should be
regarded to be spurious if no rx and no tx requests are pending.

Unfortunately the condition for testing that is wrong causing to
decide a event being spurious if no rx OR no tx requests are
pending.

Fix that plus using local variables for rx/tx pending indicators in
order to split function calls and if condition.

Fixes: 23025393dbeb3b ("xen/netback: use lateeoi irq binding")
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Reviewed-by: Wei Liu <wl@xen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>
drivers/net/xen-netback/interface.c

index e889488b84a034de8f88f83c883f2801c0d2a56d..80908958730117db39c0046717264dc1edd3db33 100644 (file)
@@ -162,13 +162,15 @@ irqreturn_t xenvif_interrupt(int irq, void *dev_id)
 {
        struct xenvif_queue *queue = dev_id;
        int old;
+       bool has_rx, has_tx;
 
        old = atomic_fetch_or(NETBK_COMMON_EOI, &queue->eoi_pending);
        WARN(old, "Interrupt while EOI pending\n");
 
-       /* Use bitwise or as we need to call both functions. */
-       if ((!xenvif_handle_tx_interrupt(queue) |
-            !xenvif_handle_rx_interrupt(queue))) {
+       has_tx = xenvif_handle_tx_interrupt(queue);
+       has_rx = xenvif_handle_rx_interrupt(queue);
+
+       if (!has_rx && !has_tx) {
                atomic_andnot(NETBK_COMMON_EOI, &queue->eoi_pending);
                xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
        }