[PATCH 5.11 716/775] mei: bus: block send with vtag on non-conformat FW

[Greg Kroah-Hartman]

From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>

commit b398d53cd421454d64850f8b1f6d609ede9042d9 upstream.

Block data send with vtag if either transport layer or
FW client are not supporting vtags.

Cc: <stable@xxxxxxxxxxxxxxx> # v5.10+
Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210208150649.141358-1-tomas.winkler@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/misc/mei/bus.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -60,6 +60,13 @@ ssize_t __mei_cl_send(struct mei_cl *cl,
 		goto out;
 	}
 
+	if (vtag) {
+		/* Check if vtag is supported by client */
+		rets = mei_cl_vt_support_check(cl);
+		if (rets)
+			goto out;
+	}
+
 	if (length > mei_cl_mtu(cl)) {
 		rets = -EFBIG;
 		goto out;