Merge v6.18.50linux-rolling-lts

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 11 insertions, 6 deletions

diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
index d957d989c0ce..dead907aa7a2 100644
--- a/drivers/mailbox/qcom-ipcc.c
+++ b/drivers/mailbox/qcom-ipcc.c
@@ -167,7 +167,7 @@ static struct mbox_chan *qcom_ipcc_mbox_xlate(struct mbox_controller *mbox,
 {
 	struct qcom_ipcc *ipcc = to_qcom_ipcc(mbox);
 	struct qcom_ipcc_chan_info *mchan;
-	struct mbox_chan *chan;
+	struct mbox_chan *chan, *free_chan = NULL;
 	struct device *dev;
 	int chan_id;
 
@@ -180,16 +180,21 @@ static struct mbox_chan *qcom_ipcc_mbox_xlate(struct mbox_controller *mbox,
 		chan = &ipcc->chans[chan_id];
 		mchan = chan->con_priv;
 
-		if (!mchan)
-			break;
-		else if (mchan->client_id == ph->args[0] &&
-				mchan->signal_id == ph->args[1])
+		if (!mchan) {
+			/* Keep scanning past holes to reject duplicate channel requests. */
+			if (!free_chan)
+				free_chan = chan;
+		} else if (mchan->client_id == ph->args[0] &&
+				mchan->signal_id == ph->args[1]) {
 			return ERR_PTR(-EBUSY);
+		}
 	}
 
-	if (chan_id >= mbox->num_chans)
+	if (!free_chan)
 		return ERR_PTR(-EBUSY);
 
+	chan = free_chan;
+
 	mchan = devm_kzalloc(dev, sizeof(*mchan), GFP_KERNEL);
 	if (!mchan)
 		return ERR_PTR(-ENOMEM);