From c5d86f08db125cadddf9afe03a791383da04926e Mon Sep 17 00:00:00 2001
From: Vipin Deep Kaur <vkaur@codeaurora.org>
Date: Tue, 30 Jun 2020 14:46:44 +0530
Subject: [PATCH] spi: spi-msm-geni: Propagate missing change from 4.19 to 5.4

Propagate following change from 4.19 to 5.4 for SPI driver.
'commit 67192635d468 ("spi: spi-geni-qcom: Check for zero length
transfer")'.

Change-Id: I27bdd8b544ba1bdaa0a868d2260c4f76c156c215
Signed-off-by: Vipin Deep Kaur <vkaur@codeaurora.org>
---
 drivers/spi/spi-msm-geni.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/spi/spi-msm-geni.c b/drivers/spi/spi-msm-geni.c
index cebb104ba372..144f8567041c 100644
--- a/drivers/spi/spi-msm-geni.c
+++ b/drivers/spi/spi-msm-geni.c
@@ -1213,6 +1213,12 @@ static int spi_geni_transfer_one(struct spi_master *spi,
 		return -EINVAL;
 	}
 
+	/* Check for zero length transfer */
+	if (xfer->len < 1) {
+		dev_err(mas->dev, "Zero length transfer\n");
+		return -EINVAL;
+	}
+
 	if (mas->cur_xfer_mode != GSI_DMA) {
 		reinit_completion(&mas->xfer_done);
 		setup_fifo_xfer(xfer, mas, slv->mode, spi);