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authorTakashi Iwai <tiwai@suse.de>2019-02-01 12:14:53 +0100
committerTakashi Iwai <tiwai@suse.de>2019-02-01 17:16:40 +0100
commit0b6a2c9cf4a00f54a0916499ece8a5cf3cced385 (patch)
tree675b07d3e0b4b06c835cacdc42e3fc1ad6c801bf /Documentation/sound/kernel-api/writing-an-alsa-driver.rst
parent6a8125c3cab887a236e9b1dc89a3416c50e46f56 (diff)
downloadlinux-0b6a2c9cf4a00f54a0916499ece8a5cf3cced385.tar.bz2
ALSA: isa: Avoid passing NULL to memory allocators
We used to pass NULL to memory allocators for ISA devices due to historical reasons. But we prefer rather a proper device object to be assigned, so let's fix it by replacing snd_dma_isa_data() call with card->dev reference, and kill snd_dma_isa_data() definition. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound/kernel-api/writing-an-alsa-driver.rst')
-rw-r--r--Documentation/sound/kernel-api/writing-an-alsa-driver.rst10
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst
index 7c2f2032d30a..6b154dbb02cc 100644
--- a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst
+++ b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst
@@ -3520,14 +3520,14 @@ allocator will try to get an area as large as possible within the
given size.
The second argument (type) and the third argument (device pointer) are
-dependent on the bus. In the case of the ISA bus, pass
-:c:func:`snd_dma_isa_data()` as the third argument with
+dependent on the bus. For normal devices, pass the device pointer
+(typically identical as ``card->dev``) to the third argument with
``SNDRV_DMA_TYPE_DEV`` type. For the continuous buffer unrelated to the
bus can be pre-allocated with ``SNDRV_DMA_TYPE_CONTINUOUS`` type and the
``snd_dma_continuous_data(GFP_KERNEL)`` device pointer, where
-``GFP_KERNEL`` is the kernel allocation flag to use. For the PCI
-scatter-gather buffers, use ``SNDRV_DMA_TYPE_DEV_SG`` with
-``snd_dma_pci_data(pci)`` (see the `Non-Contiguous Buffers`_
+``GFP_KERNEL`` is the kernel allocation flag to use. For the
+scatter-gather buffers, use ``SNDRV_DMA_TYPE_DEV_SG`` with the device
+pointer (see the `Non-Contiguous Buffers`_
section).
Once the buffer is pre-allocated, you can use the allocator in the