media: apple: isp: Add a missing read barrier (possibly?)

Signed-off-by: Asahi Lina <lina@asahilina.net>
UbuntuAsahi · Nov 19, 2024 · d82e83d · d82e83d
1 parent a6472f8
commit d82e83d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/media/platform/apple/isp/isp-ipc.c b/drivers/media/platform/apple/isp/isp-ipc.c
@@ -157,6 +157,8 @@ int ipc_chan_handle(struct apple_isp *isp, struct isp_channel *chan)
 
 static inline bool chan_tx_done(struct apple_isp *isp, struct isp_channel *chan)
 {
+	dma_rmb();
+
 	chan_read_msg(isp, chan, &chan->rsp);
 	if ((chan->rsp.arg0) == (chan->req.arg0 | ISP_IPC_FLAG_ACK)) {
 		chan_update_cursor(chan);