From: Sebastian Ott <sebott@linux.ibm.com>
Date: Thu, 27 Jun 2019 13:47:13 +0000 (+0200)
Subject: s390/pci: correctly handle MIO opt-out
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6ae3483d411638e471ca0498629b17939f1c20f4;p=linux.git

s390/pci: correctly handle MIO opt-out

Do not issue CLP_SET_ENABLE_MIO after opting out of MIO instruction
usage. This should not fix a bug but reduce overhead within firmware.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---

diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index d03631dba7c25..9bdff4defef19 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -291,7 +291,7 @@ int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 		goto out;
 
 	zdev->fh = fh;
-	if (zdev->mio_capable) {
+	if (zpci_use_mio(zdev)) {
 		rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_MIO);
 		zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
 		if (rc)