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spi: rockchip: fix probe deferral handling

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Use dma_request_chan instead of dma_request_slave_channel,
in this case we can check EPROBE_DEFER without static
warning.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Shawn Lin 2016-03-31 11:11:41 +08:00 committed by Mark Brown
parent bb51537aa8
commit e4c0e06f94
1 changed files with 9 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

14
drivers/spi/spi-rockchip.c
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@ -723,23 +723,27 @@ static int rockchip_spi_probe(struct platform_device *pdev)
master->transfer_one = rockchip_spi_transfer_one;
master->handle_err = rockchip_spi_handle_err;
rs->dma_tx.ch = dma_request_slave_channel(rs->dev, "tx");
if (IS_ERR_OR_NULL(rs->dma_tx.ch)) {
rs->dma_tx.ch = dma_request_chan(rs->dev, "tx");
if (IS_ERR(rs->dma_tx.ch)) {
/* Check tx to see if we need defer probing driver */
if (PTR_ERR(rs->dma_tx.ch) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto err_get_fifo_len;
}
dev_warn(rs->dev, "Failed to request TX DMA channel\n");
rs->dma_tx.ch = NULL;
}
rs->dma_rx.ch = dma_request_slave_channel(rs->dev, "rx");
if (!rs->dma_rx.ch) {
if (rs->dma_tx.ch) {
rs->dma_rx.ch = dma_request_chan(rs->dev, "rx");
if (IS_ERR(rs->dma_rx.ch)) {
if (PTR_ERR(rs->dma_rx.ch) == -EPROBE_DEFER) {
dma_release_channel(rs->dma_tx.ch);
rs->dma_tx.ch = NULL;
ret = -EPROBE_DEFER;
goto err_get_fifo_len;
}
dev_warn(rs->dev, "Failed to request RX DMA channel\n");
rs->dma_rx.ch = NULL;
}
if (rs->dma_tx.ch && rs->dma_rx.ch) {