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spi-topcliff-pch: Fix probing when DMA mode is used

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If during registering SPI master due to SPI device probing a SPI transfer
is issued the DMA buffers are not allocated yet.

This fixes the following oops:
pch_spi 0000:02:0c.1: enabling device (0000 -> 0002)
pch_spi 0000:02:0c.1: master is unqueued, this is deprecated
BUG: unable to handle kernel NULL pointer dereference at   (null)
IP: [<c125aa05>] pch_spi_handle_dma+0x15c/0x6f4
[...]

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Alexander Stein 2014-02-26 16:31:19 +01:00 committed by Mark Brown
parent 7611c7a561
commit 7995d74ab2
1 changed files with 6 additions and 5 deletions
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11
drivers/spi/spi-topcliff-pch.c
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@ -1452,6 +1452,11 @@ static int pch_spi_pd_probe(struct platform_device *plat_dev)
pch_spi_set_master_mode(master);
if (use_dma) {
dev_info(&plat_dev->dev, "Use DMA for data transfers\n");
pch_alloc_dma_buf(board_dat, data);
}
ret = spi_register_master(master);
if (ret != 0) {
dev_err(&plat_dev->dev,
@ -1459,14 +1464,10 @@ static int pch_spi_pd_probe(struct platform_device *plat_dev)
goto err_spi_register_master;
}
if (use_dma) {
dev_info(&plat_dev->dev, "Use DMA for data transfers\n");
pch_alloc_dma_buf(board_dat, data);
}
return 0;
err_spi_register_master:
pch_free_dma_buf(board_dat, data);
free_irq(board_dat->pdev->irq, data);
err_request_irq:
pch_spi_free_resources(board_dat, data);