Commit dc82e524 authored May 15, 2018 by Takashi Iwai

ALSA: core: Assure control device to be registered at last



The commit 289ca025 ("ALSA: Use priority list for managing device
list") changed the way to register/disconnect/free devices via a
single priority list.  This helped to make behavior consistent, but it
also changed a slight behavior change: namely, the control device is
registered earlier than others, while it was supposed to be the very
last one.

I've put SNDRV_DEV_CONTROL in the current position as the release of
ctl elements often conflict with the private ctl elements some PCM or
other components may create, which often leads to a double-free.
But, the order of register and disconnect should be indeed fixed as
expected in the early days: the control device gets registered at
last, and disconnected at first.

This patch changes the priority list order to move SNDRV_DEV_CONTROL
as the last guy to assure the register / disconnect order.  Meanwhile,
for keeping the messy resource release order, manually treat the
control and lowlevel devices as last freed one.

Additional note:
The lowlevel device is the device where a card driver creates at
probe.  And, we still keep the release order control -> lowlevel, as
there might  be link from a control element back to a lowlevel object.

Fixes: 289ca025 ("ALSA: Use priority list for managing device list")
Reported-by: Tzung-Bi Shih <tzungbi@google.com>
Tested-by: Tzung-Bi Shih <tzungbi@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent 377a879d

include/sound/core.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -51,7 +51,6 @@ struct completion;
		*/
		enum snd_device_type {
		SNDRV_DEV_LOWLEVEL,
		SNDRV_DEV_CONTROL,
		SNDRV_DEV_INFO,
		SNDRV_DEV_BUS,
		SNDRV_DEV_CODEC,
		@@ -62,6 +61,7 @@ enum snd_device_type {
		SNDRV_DEV_SEQUENCER,
		SNDRV_DEV_HWDEP,
		SNDRV_DEV_JACK,
		SNDRV_DEV_CONTROL, /* NOTE: this must be the last one */
		};

		enum snd_device_state {

sound/core/device.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -240,6 +240,15 @@ void snd_device_free_all(struct snd_card *card)

		if (snd_BUG_ON(!card))
		return;
		list_for_each_entry_safe_reverse(dev, next, &card->devices, list) {
		/* exception: free ctl and lowlevel stuff later */
		if (dev->type == SNDRV_DEV_CONTROL \|\|
		dev->type == SNDRV_DEV_LOWLEVEL)
		continue;
		__snd_device_free(dev);
		}

		/* free all */
		list_for_each_entry_safe_reverse(dev, next, &card->devices, list)
		__snd_device_free(dev);
		}