This reminds me...
Someone needs to go through ALSA and audit all delays executed via
$FOO_interruptible().
Several delays within ALSA wait for hardware conditions, and do not
check for signals pending, which means that the wait-for-condition loop
becomes a busy loop:
while (1) {
foo = read_hardware()
if (foo & interesting_bits)
break;
schedule_timeout_interruptible(1);
}
The proper fix is (a) remove "_interruptible" [recommended] or (b) check
for signals.
grep'ing for "_interruptible" quickly finds several such ALSA bugs.
Jeff
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