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fe5b85c656
dma_terminate_all maybe called in interrupt context which means WARN_ON() will be triggered as below when bd memory freed. Allocat bd memory from dma pool instead. [ 29.161079] WARNING: CPU: 1 PID: 533 at ./include/linux/dma-mapping.h:541 sdma_free_bd+0xa4/0xb4 [ 29.169883] Modules linked in: [ 29.172990] CPU: 1 PID: 533 Comm: mpegaudioparse0 Not tainted 4.18.0-rc1-next-20180618-00009-gf79f22c #20 [ 29.182597] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 29.189163] Backtrace: [ 29.191685] [<c010d1e0>] (dump_backtrace) from [<c010d4a0>] (show_stack+0x18/0x1c) [ 29.199306] r7:00000000 r6:600f0093 r5:00000000 r4:c107db7c [ 29.205029] [<c010d488>] (show_stack) from [<c0a5bba0>] (dump_stack+0xb4/0xe8) [ 29.212312] [<c0a5baec>] (dump_stack) from [<c012703c>] (__warn+0x104/0x130) [ 29.219411] r9:ec3e817c r8:0000021d r7:00000009 r6:c0d1d440 r5:00000000 r4:00000000 [ 29.227204] [<c0126f38>] (__warn) from [<c0127180>] (warn_slowpath_null+0x44/0x50) [ 29.234821] r8:ed129dc4 r7:c0b01978 r6:c04d4e90 r5:0000021d r4:c0d1d440 [ 29.241574] [<c012713c>] (warn_slowpath_null) from [<c04d4e90>] (sdma_free_bd+0xa4/0xb4) [ 29.249706] r6:4c001000 r5:f082e000 r4:00000024 [ 29.254376] [<c04d4dec>] (sdma_free_bd) from [<c04d4eb4>] (sdma_desc_free+0x14/0x20) [ 29.262163] r7:ec3e8110 r6:00000100 r5:00000200 r4:ecf89a00 [ 29.267873] [<c04d4ea0>] (sdma_desc_free) from [<c04d229c>] (vchan_dma_desc_free_list+0xa4/0xac) [ 29.276697] r5:00000200 r4:ed129d9c [ 29.280326] [<c04d21f8>] (vchan_dma_desc_free_list) from [<c04d482c>] (sdma_disable_channel_with_delay+0x14c/0x188) [ 29.290808] r9:ecae560c r8:ec3e815c r7:00000000 r6:c1008908 r5:ed129dc4 r4:ec3e8110 [ 29.298605] [<c04d46e0>] (sdma_disable_channel_with_delay) from [<c07c5c84>] (snd_dmaengine_pcm_trigger+0x90/0x1b0) [ 29.309087] r8:ecae5000 r7:ec940800 r6:ed31bd80 r5:ecadb200 r4:ec26a700 [ 29.315855] [<c07c5bf4>] (snd_dmaengine_pcm_trigger) from [<c07dd800>] (soc_pcm_trigger+0xb4/0x130) [ 29.324953] r8:ecae5000 r7:ec940800 r6:00000000 r5:ecadb200 r4:ec26a700 [ 29.331716] [<c07dd74c>] (soc_pcm_trigger) from [<c07bc008>] (snd_pcm_do_stop+0x58/0x5c) [ 29.339859] r9:ecaed5a8 r8:ed31bdc0 r7:00000000 r6:00000001 r5:ecadb200 r4:c0b9c4d0 [ 29.347652] [<c07bbfb0>] (snd_pcm_do_stop) from [<c07bbde8>] (snd_pcm_action_single+0x40/0x80) [ 29.356315] [<c07bbda8>] (snd_pcm_action_single) from [<c07bbf1c>] (snd_pcm_action+0xf4/0xfc) [ 29.364883] r7:00000001 r6:c0b9c4d0 r5:ecadb2d4 r4:ecadb200 [ 29.370593] [<c07bbe28>] (snd_pcm_action) from [<c07bc8dc>] (snd_pcm_drop+0x58/0x9c) Signed-off-by: Robin Gong <yibin.gong@nxp.com> Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de> Tested-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.