@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/device.h>
#include <linux/file.h>
+#include <linux/freezer.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/ctype.h>
@@ -573,6 +574,11 @@ void snd_card_disconnect_sync(struct snd_card *card)
return;
}
+ if (processes_frozen()) {
+ dev_err(card->dev, "Userspace is frozen, skipping sync\n");
+ return;
+ }
+
spin_lock_irq(&card->files_lock);
wait_event_lock_irq(card->remove_sleep,
list_empty(&card->files_list),
@@ -658,6 +664,13 @@ int snd_card_free(struct snd_card *card)
ret = snd_card_free_when_closed(card);
if (ret)
return ret;
+
+ /*
+ * If userspace is frozen the wait from completion will never end.
+ */
+ if (processes_frozen())
+ return 0;
+
/* wait, until all devices are ready for the free operation */
wait_for_completion(&released);
If the user space is frozen, we cannot wait for it to complete. This fixes: [ 84.943749] Freezing user space processes ... (elapsed 0.111 seconds) done. [ 246.784446] INFO: task kexec-lite:5123 blocked for more than 122 seconds. [ 246.819035] Call Trace: [ 246.821782] <TASK> [ 246.824186] __schedule+0x5f9/0x1263 [ 246.828231] schedule+0x87/0xc5 [ 246.831779] snd_card_disconnect_sync+0xb5/0x127 ... [ 246.889249] snd_sof_device_shutdown+0xb4/0x150 [ 246.899317] pci_device_shutdown+0x37/0x61 [ 246.903990] device_shutdown+0x14c/0x1d6 [ 246.908391] kernel_kexec+0x45/0xb9 And: [ 246.893222] INFO: task kexec-lite:4891 blocked for more than 122 seconds. [ 246.927709] Call Trace: [ 246.930461] <TASK> [ 246.932819] __schedule+0x5f9/0x1263 [ 246.936855] ? fsnotify_grab_connector+0x5c/0x70 [ 246.942045] schedule+0x87/0xc5 [ 246.945567] schedule_timeout+0x49/0xf3 [ 246.949877] wait_for_completion+0x86/0xe8 [ 246.954463] snd_card_free+0x68/0x89 ... [ 247.001080] platform_device_unregister+0x12/0x35 Fixes: 83bfc7e793b5 ("ASoC: SOF: core: unregister clients and machine drivers in .shutdown") Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> --- sound/core/init.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)