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Message-Id: <20200116174251.24326-165-sashal@kernel.org>
Date: Thu, 16 Jan 2020 12:42:42 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Peng Fan <peng.fan@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Sasha Levin <sashal@...nel.org>, linux-serial@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.4 165/174] tty: serial: imx: use the sg count from dma_map_sg
From: Peng Fan <peng.fan@....com>
[ Upstream commit 596fd8dffb745afcebc0ec6968e17fe29f02044c ]
The dmaengine_prep_slave_sg needs to use sg count returned
by dma_map_sg, not use sport->dma_tx_nents, because the return
value of dma_map_sg is not always same with "nents".
Fixes: b4cdc8f61beb ("serial: imx: add DMA support for imx6q")
Signed-off-by: Peng Fan <peng.fan@....com>
Link: https://lore.kernel.org/r/1573108875-26530-1-git-send-email-peng.fan@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/tty/serial/imx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index d607cb2eb64e..b59d0dafefab 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -545,7 +545,7 @@ static void imx_dma_tx(struct imx_port *sport)
dev_err(dev, "DMA mapping error for TX.\n");
return;
}
- desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents,
+ desc = dmaengine_prep_slave_sg(chan, sgl, ret,
DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
if (!desc) {
dma_unmap_sg(dev, sgl, sport->dma_tx_nents,
--
2.20.1
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