Merge remote-tracking branch tech/mproc/rpmsg into qcom-next

Author: sgaud-quic

drivers/rpmsg/qcom_glink_smem.c

@@ -86,9 +86,14 @@ static size_t glink_smem_rx_avail(struct qcom_glink_pipe *np)
 	tail = le32_to_cpu(*pipe->tail);
 
 	if (head < tail)
-		return pipe->native.length - tail + head;
+		len = pipe->native.length - tail + head;
 	else
-		return head - tail;
+		len = head - tail;
+
+	if (WARN_ON_ONCE(len > pipe->native.length))
+		len = 0;
+
+	return len;
 }
 
 static void glink_smem_rx_peek(struct qcom_glink_pipe *np,
@@ -99,6 +104,10 @@ static void glink_smem_rx_peek(struct qcom_glink_pipe *np,
 	u32 tail;
 
 	tail = le32_to_cpu(*pipe->tail);
+
+	if (WARN_ON_ONCE(tail > pipe->native.length))
+		return;
+
 	tail += offset;
 	if (tail >= pipe->native.length)
 		tail -= pipe->native.length;
@@ -121,7 +130,7 @@ static void glink_smem_rx_advance(struct qcom_glink_pipe *np,
 
 	tail += count;
 	if (tail >= pipe->native.length)
-		tail -= pipe->native.length;
+		tail %= pipe->native.length;
 
 	*pipe->tail = cpu_to_le32(tail);
 }
@@ -146,6 +155,9 @@ static size_t glink_smem_tx_avail(struct qcom_glink_pipe *np)
 	else
 		avail -= FIFO_FULL_RESERVE + TX_BLOCKED_CMD_RESERVE;
 
+	if (WARN_ON_ONCE(avail > pipe->native.length))
+		avail = 0;
+
 	return avail;
 }
 
@@ -155,6 +167,9 @@ static unsigned int glink_smem_tx_write_one(struct glink_smem_pipe *pipe,
 {
 	size_t len;
 
+	if (WARN_ON_ONCE(head > pipe->native.length))
+		return head;
+
 	len = min_t(size_t, count, pipe->native.length - head);
 	if (len)
 		memcpy(pipe->fifo + head, data, len);