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| author | Alexander Stein <alexander.stein@systec-electronic.com> | 2014-02-26 16:31:19 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-02-27 05:37:10 +0100 |
| commit | 7995d74ab297e4f5526c8df70007e1e39f0d1f5c (patch) | |
| tree | 88238f2de99a43fc1ac43f3811145712cc7d3c49 /drivers/spi | |
| parent | spi/topcliff-pch: Fix DMA channel (diff) | |
| download | linux-7995d74ab297e4f5526c8df70007e1e39f0d1f5c.tar.xz linux-7995d74ab297e4f5526c8df70007e1e39f0d1f5c.zip | |
spi-topcliff-pch: Fix probing when DMA mode is used
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-topcliff-pch.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c index 3383008ce04d..88eb57e858b3 100644 --- a/drivers/spi/spi-topcliff-pch.c +++ b/drivers/spi/spi-topcliff-pch.c @@ -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); |