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This issue was caused by two cards using the same dai(cpu_dai/codec_dai). the second one will fail to register as a card, then will release the same dai resource, leading to the first card crash. [ 79.032274] Unable to handle kernel paging request at virtual address ffffffffffffffe0 [ 79.035543] Hardware name: Rockchip RK3399 Excavator Board edp (Android) (DT) [ 79.036171] task: ffffffc0dd126c00 task.stack: ffffffc0d109c000 [ 79.036717] PC is at dapm_widget_invalidate_output_paths+0x98/0xe0 [ 79.037268] LR is at soc_dapm_dai_stream_event+0x60/0x9c [ 79.184613] Call trace: [ 79.192401] [<ffffff80088e9028>] dapm_widget_invalidate_output_paths+0x98/0xe0 [ 79.193044] [<ffffff80088ea0d0>] soc_dapm_dai_stream_event+0x60/0x9c [ 79.193611] [<ffffff80088eeb9c>] snd_soc_dapm_stream_event+0x44/0x94 [ 79.194175] [<ffffff80088e515c>] snd_soc_suspend+0x23c/0x2fc [ 79.194686] [<ffffff800852d1f0>] platform_pm_suspend+0x38/0x54 [ 79.195208] [<ffffff8008536e88>] dpm_run_callback+0x110/0x1bc [ 79.195726] [<ffffff8008537578>] __device_suspend+0x164/0x2a4 [ 79.196242] [<ffffff80085392b0>] dpm_suspend+0x70/0x338 [ 79.196713] [<ffffff8008539ab0>] dpm_suspend_start+0x64/0x68 [ 79.197226] [<ffffff80080f0b9c>] suspend_devices_and_enter+0x74/0x2d8 [ 79.197800] [<ffffff80080f140c>] pm_suspend+0x60c/0x668 [ 79.198272] [<ffffff80080ef7b4>] state_store+0x50/0x84 [ 79.198734] [<ffffff800839d128>] kobj_attr_store+0x14/0x24 [ 79.199234] [<ffffff8008232fd8>] sysfs_kf_write+0x38/0x50 [ 79.199718] [<ffffff8008232208>] kernfs_fop_write+0x124/0x180 [ 79.200237] [<ffffff80081bf76c>] __vfs_write+0x38/0xfc [ 79.200695] [<ffffff80081bffd4>] vfs_write+0x9c/0x170 [ 79.201153] [<ffffff80081c0a18>] SyS_write+0x5c/0xbc [ 79.201604] [<ffffff80080832f0>] el0_svc_naked+0x24/0x28 [ 79.202079] Code: 54000081 f9408000 d1040000 17ffffef (39406025) [ 79.202693] ---[ end trace dec5980253348a7f ]--- Change-Id: I6bbbeefaa68a7d5dfccc1bba57d61216b4be1035 Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
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.