linux-kernel - [PATCH][linux-next] dmaengine: dw-axi-dmac: Fix uninitialized variable in axi_chan_block_xfer

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Message-Id: <20211019190701.15525-1-tim.gardner@canonical.com>
Date:   Tue, 19 Oct 2021 13:07:01 -0600
From:   Tim Gardner <tim.gardner@...onical.com>
To:     dmaengine@...r.kernel.org
Cc:     tim.gardner@...onical.com,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH][linux-next] dmaengine: dw-axi-dmac: Fix uninitialized variable in axi_chan_block_xfer_start()

Coverity complains of an uninitialized variable:

5. uninit_use_in_call: Using uninitialized value config.dst_per when calling axi_chan_config_write. [show details]
6. uninit_use_in_call: Using uninitialized value config.hs_sel_src when calling axi_chan_config_write. [show details]
CID 121164 (#1-3 of 3): Uninitialized scalar variable (UNINIT)
7. uninit_use_in_call: Using uninitialized value config.src_per when calling axi_chan_config_write. [show details]
418        axi_chan_config_write(chan, &config);

Fix this by clearing the structure which should at least be benign in axi_chan_config_write(). Also fix
what looks like a cut-n-paste error when initializing config.hs_sel_dst.

Fixes: 824351668a413 ("dmaengine: dw-axi-dmac: support DMAX_NUM_CHANNELS > 8")
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Cc: Vinod Koul <vkoul@...nel.org>
Cc: dmaengine@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
---
 drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
index 79572ec532ef..f47116e77ea1 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -386,12 +386,13 @@ static void axi_chan_block_xfer_start(struct axi_dma_chan *chan,
 
 	axi_dma_enable(chan->chip);
 
+	memset(&config, 0, sizeof(config));
 	config.dst_multblk_type = DWAXIDMAC_MBLK_TYPE_LL;
 	config.src_multblk_type = DWAXIDMAC_MBLK_TYPE_LL;
 	config.tt_fc = DWAXIDMAC_TT_FC_MEM_TO_MEM_DMAC;
 	config.prior = priority;
 	config.hs_sel_dst = DWAXIDMAC_HS_SEL_HW;
-	config.hs_sel_dst = DWAXIDMAC_HS_SEL_HW;
+	config.hs_sel_src = DWAXIDMAC_HS_SEL_HW;
 	switch (chan->direction) {
 	case DMA_MEM_TO_DEV:
 		dw_axi_dma_set_byte_halfword(chan, true);
-- 
2.33.1