linux-kernel - [PATCH AUTOSEL 6.6 25/47] pds_vdpa: clear config callback when status goes to 0

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Message-ID: <20231211135147.380223-25-sashal@kernel.org>
Date:   Mon, 11 Dec 2023 08:50:26 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Shannon Nelson <shannon.nelson@....com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Sasha Levin <sashal@...nel.org>, allen.hubbe@....com,
        virtualization@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.6 25/47] pds_vdpa: clear config callback when status goes to 0

From: Shannon Nelson <shannon.nelson@....com>

[ Upstream commit dd3b8de16e90c5594eddd29aeeb99e97c6f863be ]

If the client driver is setting status to 0, something is
getting shutdown and possibly removed.  Make sure we clear
the config_cb so that it doesn't end up crashing when
trying to call a bogus callback.

Signed-off-by: Shannon Nelson <shannon.nelson@....com>
Message-Id: <20231110221802.46841-3-shannon.nelson@....com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Acked-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/vdpa/pds/vdpa_dev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/pds/vdpa_dev.c b/drivers/vdpa/pds/vdpa_dev.c
index 52b2449182ad7..9fc89c82d1f01 100644
--- a/drivers/vdpa/pds/vdpa_dev.c
+++ b/drivers/vdpa/pds/vdpa_dev.c
@@ -461,8 +461,10 @@ static void pds_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
 
 	pds_vdpa_cmd_set_status(pdsv, status);
 
-	/* Note: still working with FW on the need for this reset cmd */
 	if (status == 0) {
+		struct vdpa_callback null_cb = { };
+
+		pds_vdpa_set_config_cb(vdpa_dev, &null_cb);
 		pds_vdpa_cmd_reset(pdsv);
 
 		for (i = 0; i < pdsv->num_vqs; i++) {
-- 
2.42.0