linux-kernel - [PATCH] dma: ti: fix a missing check in omap_dma_prep_dma

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Date:   Sat, 23 Mar 2019 17:39:43 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dma: ti: fix a missing check in omap_dma_prep_dma_cyclic

It is invalid when "buf_len" is not aligned with "period_len".

The fix adds a check for the alignment.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/dma/ti/omap-dma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/ti/omap-dma.c b/drivers/dma/ti/omap-dma.c
index a4a931ddf6f6..5f0ce1975e52 100644
--- a/drivers/dma/ti/omap-dma.c
+++ b/drivers/dma/ti/omap-dma.c
@@ -1065,6 +1065,9 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
 	unsigned es;
 	u32 burst;
 
+	if (buf_len % period_len)
+		return NULL;
+
 	if (dir == DMA_DEV_TO_MEM) {
 		dev_addr = c->cfg.src_addr;
 		dev_width = c->cfg.src_addr_width;
-- 
2.17.1