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authorAlexander Stein <alexander.stein@systec-electronic.com>2014-02-26 19:31:19 +0400
committerMark Brown <broonie@linaro.org>2014-02-27 08:37:10 +0400
commit7995d74ab297e4f5526c8df70007e1e39f0d1f5c (patch)
tree88238f2de99a43fc1ac43f3811145712cc7d3c49 /drivers/spi/spi-topcliff-pch.c
parent7611c7a5613f20ec2fb536c1d868d15045730bc0 (diff)
downloadlinux-7995d74ab297e4f5526c8df70007e1e39f0d1f5c.tar.xz
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/spi-topcliff-pch.c')
-rw-r--r--drivers/spi/spi-topcliff-pch.c11
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);