From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Peng Fan <peng.fan@nxp.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sasha Levin <sashal@kernel.org>,
linux-serial@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 5.4 138/205] tty: serial: imx: use the sg count from dma_map_sg
Date: Thu, 16 Jan 2020 11:41:53 -0500 [thread overview]
Message-ID: <20200116164300.6705-138-sashal@kernel.org> (raw)
In-Reply-To: <20200116164300.6705-1-sashal@kernel.org>
From: Peng Fan <peng.fan@nxp.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@nxp.com>
Link: https://lore.kernel.org/r/1573108875-26530-1-git-send-email-peng.fan@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.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 5e08f2657b90..34f602c3a882 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -619,7 +619,7 @@ static void imx_uart_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
next parent reply other threads:[~2020-01-16 16:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200116164300.6705-1-sashal@kernel.org>
2020-01-16 16:41 ` Sasha Levin [this message]
2020-01-16 16:41 ` [PATCH AUTOSEL 5.4 139/205] tty: serial: pch_uart: correct usage of dma_unmap_sg Sasha Levin
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