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spi: rockchip: check return value of dmaengine_prep_slave_sg 

We should check return value of dmaengine_prep_slave_sg, otherwise
we take risk of null pointer.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Shawn Lin 2016-03-09 16:11:15 +08:00 committed by Mark Brown
parent 0277e01aeb
commit ea98491133
1 changed files with 12 additions and 3 deletions
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15
drivers/spi/spi-rockchip.c
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@ -436,7 +436,7 @@ static void rockchip_spi_dma_txcb(void *data)
spin_unlock_irqrestore(&rs->lock, flags);
}
static void rockchip_spi_prepare_dma(struct rockchip_spi *rs)
static int rockchip_spi_prepare_dma(struct rockchip_spi *rs)
{
unsigned long flags;
struct dma_slave_config rxconf, txconf;
@ -459,6 +459,8 @@ static void rockchip_spi_prepare_dma(struct rockchip_spi *rs)
rs->dma_rx.ch,
rs->rx_sg.sgl, rs->rx_sg.nents,
rs->dma_rx.direction, DMA_PREP_INTERRUPT);
if (!rxdesc)
return -EINVAL;
rxdesc->callback = rockchip_spi_dma_rxcb;
rxdesc->callback_param = rs;
@ -476,6 +478,11 @@ static void rockchip_spi_prepare_dma(struct rockchip_spi *rs)
rs->dma_tx.ch,
rs->tx_sg.sgl, rs->tx_sg.nents,
rs->dma_tx.direction, DMA_PREP_INTERRUPT);
if (!txdesc) {
if (rxdesc)
dmaengine_terminate_sync(rs->dma_rx.ch);
return -EINVAL;
}
txdesc->callback = rockchip_spi_dma_txcb;
txdesc->callback_param = rs;
@ -497,6 +504,8 @@ static void rockchip_spi_prepare_dma(struct rockchip_spi *rs)
dmaengine_submit(txdesc);
dma_async_issue_pending(rs->dma_tx.ch);
}
return 0;
}
static void rockchip_spi_config(struct rockchip_spi *rs)
@ -610,12 +619,12 @@ static int rockchip_spi_transfer_one(
if (rs->use_dma) {
if (rs->tmode == CR0_XFM_RO) {
/* rx: dma must be prepared first */
rockchip_spi_prepare_dma(rs);
ret = rockchip_spi_prepare_dma(rs);
spi_enable_chip(rs, 1);
} else {
/* tx or tr: spi must be enabled first */
spi_enable_chip(rs, 1);
rockchip_spi_prepare_dma(rs);
ret = rockchip_spi_prepare_dma(rs);
}
} else {
spi_enable_chip(rs, 1);