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serial: imx: unmap sg in case of dmaengine_prep_slave_sg() failure

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In case dmaengine_prep_slave_sg() fails, add the missing dma_unmap_sg().

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Anton Bondarenko <anton_bondarenko@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dirk Behme 2014-12-09 18:11:26 +09:00 committed by Greg Kroah-Hartman
parent 7942f8577f
commit 2464982174
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/imx.c
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@ -558,6 +558,8 @@ static void imx_dma_tx(struct imx_port *sport)
desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents,
DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
if (!desc) {
dma_unmap_sg(dev, sgl, sport->dma_tx_nents,
DMA_TO_DEVICE);
dev_err(dev, "We cannot prepare for the TX slave dma!\n");
return;
}
@ -947,6 +949,7 @@ static int start_rx_dma(struct imx_port *sport)
desc = dmaengine_prep_slave_sg(chan, sgl, 1, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT);
if (!desc) {
dma_unmap_sg(dev, sgl, 1, DMA_FROM_DEVICE);
dev_err(dev, "We cannot prepare for the RX slave dma!\n");
return -EINVAL;
}