xen/pciback: Save the number of MSI-X entries to be copied later.

[ Upstream commit 4cf5aa2ffe17403385d75a5b1d9d97071500ea18 ]

commit d159457b84395927b5a52adb72f748dd089ad5e5 upstream.

Commit 8135cf8b092723dbfcc611fe6fdcb3a36c9951c5 (xen/pciback: Save
xen_pci_op commands before processing it) broke enabling MSI-X because
it would never copy the resulting vectors into the response.  The
number of vectors requested was being overwritten by the return value
(typically zero for success).

Save the number of vectors before processing the op, so the correct
number of vectors are copied afterwards.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/xen/xen-pciback/pciback_ops.c b/drivers/xen/xen-pciback/pciback_ops.c
index a0e0e3e..e8babfd 100644 (file)
--- a/drivers/xen/xen-pciback/pciback_ops.c
+++ b/drivers/xen/xen-pciback/pciback_ops.c
@@ -300,6 +300,9 @@ void xen_pcibk_do_op(struct work_struct *data)
        struct xen_pcibk_dev_data *dev_data = NULL;
        struct xen_pci_op *op = &pdev->op;
        int test_intx = 0;
+#ifdef CONFIG_PCI_MSI
+       unsigned int nr = 0;
+#endif
 
        *op = pdev->sh_info->op;
        barrier();
@@ -328,6 +331,7 @@ void xen_pcibk_do_op(struct work_struct *data)
                        op->err = xen_pcibk_disable_msi(pdev, dev, op);
                        break;
                case XEN_PCI_OP_enable_msix:
+                       nr = op->value;
                        op->err = xen_pcibk_enable_msix(pdev, dev, op);
                        break;
                case XEN_PCI_OP_disable_msix:
@@ -350,7 +354,7 @@ void xen_pcibk_do_op(struct work_struct *data)
        if (op->cmd == XEN_PCI_OP_enable_msix && op->err == 0) {
                unsigned int i;
 
-               for (i = 0; i < op->value; i++)
+               for (i = 0; i < nr; i++)
                        pdev->sh_info->op.msix_entries[i].vector =
                                op->msix_entries[i].vector;
        }