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5d61f0ba65
When ASoC driver is unbound dynamically during its operation (i.e. a kind of hot-unplug), we may hit Oops due to the resource access after the release by a delayed work, something like: Unable to handle kernel paging request at virtual address dead000000000220 .... PC is at soc_dapm_dai_stream_event.isra.14+0x20/0xd0 LR is at snd_soc_dapm_stream_event+0x74/0xa8 .... [<ffff000008715610>] soc_dapm_dai_stream_event.isra.14+0x20/0xd0 [<ffff00000871989c>] snd_soc_dapm_stream_event+0x74/0xa8 [<ffff00000871b23c>] close_delayed_work+0x3c/0x50 [<ffff0000080bbd6c>] process_one_work+0x1ac/0x318 [<ffff0000080bbf20>] worker_thread+0x48/0x420 [<ffff0000080c201c>] kthread+0xfc/0x128 [<ffff0000080842f0>] ret_from_fork+0x10/0x18 For fixing the race, this patch adds a sync-point in pcm private_free callback to finish the delayed work before actually releasing the resources. Reported-by: Hiep Cao Minh <cm-hiep@jinso.co.jp> Reported-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@kernel.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.