[PATCH 4.14 226/237] virtio-pci: Remove wrong address verification in vp_del_vqs()

[Greg Kroah-Hartman]

From: Murilo Opsfelder Araujo <muriloo@xxxxxxxxxxxxx>

commit 7e415282b41bf0d15c6e0fe268f822d9b083f2f7 upstream.

GCC 12 enhanced -Waddress when comparing array address to null [0],
which warns:

    drivers/virtio/virtio_pci_common.c: In function ‘vp_del_vqs’:
    drivers/virtio/virtio_pci_common.c:257:29: warning: the comparison will always evaluate as ‘true’ for the pointer operand in ‘vp_dev->msix_affinity_masks + (sizetype)((long unsigned int)i * 256)’ must not be NULL [-Waddress]
      257 |                         if (vp_dev->msix_affinity_masks[i])
          |                             ^~~~~~

In fact, the verification is comparing the result of a pointer
arithmetic, the address "msix_affinity_masks + i", which will always
evaluate to true.

Under the hood, free_cpumask_var() calls kfree(), which is safe to pass
NULL, not requiring non-null verification.  So remove the verification
to make compiler happy (happy compiler, happy life).

[0] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102103

Signed-off-by: Murilo Opsfelder Araujo <muriloo@xxxxxxxxxxxxx>
Message-Id: <20220415023002.49805-1-muriloo@xxxxxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Christophe de Dinechin <dinechin@xxxxxxxxxx>
Cc: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/virtio/virtio_pci_common.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -256,8 +256,7 @@ void vp_del_vqs(struct virtio_device *vd
 
 	if (vp_dev->msix_affinity_masks) {
 		for (i = 0; i < vp_dev->msix_vectors; i++)
-			if (vp_dev->msix_affinity_masks[i])
-				free_cpumask_var(vp_dev->msix_affinity_masks[i]);
+			free_cpumask_var(vp_dev->msix_affinity_masks[i]);
 	}
 
 	if (vp_dev->msix_enabled) {