ALSA: x86: Properly manage PCM substream lifetype

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The PCM substream is referred not only in the PCM callbacks but also
in the irq handler and in the hotplug/unplug codes.  The latter code
paths don't take the PCM lock, thus the PCM may be released
unexpectedly while calling PCM helper functions or accessing
pcm->runtime fields.

This patch implements a simple refcount to assure the PCM substream
accessibility while the other codes are accessing.  It needed some
code refactoring in the relevant functions for avoiding the doubly
spinlocks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

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This commit is contained in:

Takashi Iwai 2017-02-02 13:00:12 +01:00

parent 7d9e79869b

commit 313d9f28c1

2 changed files with 98 additions and 74 deletions

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171

sound/x86/intel_hdmi_audio.c

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3

sound/x86/intel_hdmi_audio.h

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