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The use_count of the swidget is protect by ALSA core PCM locking with the exception when an associated kcontrol is changed. It has been observed that a rightly timed kcontrol access during stream stop can result of an attempt to send a control update to a widget which has been freed up between the check of the use_count and the message sending. We need to protect the entire sof_widget_setup() and sof_widget_free() execution to make it safe to rely on the use_count. Move the code under an _unlocked() function and use a mutex to protect the execution of the functions for concurrency. On the control path we need to use the lock only for the kcontrol access, the widget_kcontrol_setup() op is called with the lock already held. Reported-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Link: https://lore.kernel.org/r/20230127120031.10709-18-peter.ujfalusi@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org> |
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| ac97 | ||
| aoa | ||
| arm | ||
| atmel | ||
| core | ||
| drivers | ||
| firewire | ||
| hda | ||
| i2c | ||
| isa | ||
| mips | ||
| oss | ||
| parisc | ||
| pci | ||
| pcmcia | ||
| ppc | ||
| sh | ||
| soc | ||
| sparc | ||
| spi | ||
| synth | ||
| usb | ||
| virtio | ||
| x86 | ||
| xen | ||
| ac97_bus.c | ||
| Kconfig | ||
| last.c | ||
| Makefile | ||
| sound_core.c | ||