linux-kernel - [PATCH v2 1/2] vdpa: add the check for id_table in struct vdpa_mgmt

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Date:   Mon, 25 Apr 2022 14:27:33 +0800
From:   Cindy Lu <lulu@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com, lulu@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] vdpa: add the check for id_table in struct vdpa_mgmt_dev

To support the dynamic ids in vp_vdpa, we need to add the check for
id table. If the id table is NULL, will not set the device type

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/vdpa/vdpa.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 1ea525433a5c..09edd92cede0 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -492,10 +492,13 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
 	if (err)
 		goto msg_err;
 
-	while (mdev->id_table[i].device) {
-		if (mdev->id_table[i].device <= 63)
-			supported_classes |= BIT_ULL(mdev->id_table[i].device);
-		i++;
+	if (mdev->id_table != NULL) {
+		while (mdev->id_table[i].device) {
+			if (mdev->id_table[i].device <= 63)
+				supported_classes |=
+					BIT_ULL(mdev->id_table[i].device);
+			i++;
+		}
 	}
 
 	if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES,
-- 
2.34.1