ASoC: cs35l56: Prevent unbalanced pm_runtime in dsp_work() on SoundWire

Flush the SoundWire interrupt handler work instead of cancelling it.

When a SoundWire interrupt is triggered the pm_runtime is held
until the work has completed. It's therefore unsafe to cancel
the work, it must be flushed.

Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com
Link: https://lore.kernel.org/r/20230512144237.739000-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org

sound/soc/codecs/cs35l56.c

@@ -852,10 +852,11 @@ static void cs35l56_dsp_work(struct work_struct *work)
 	 */
 	if (cs35l56->sdw_peripheral) {
 		cs35l56->sdw_irq_no_unmask = true;
-		cancel_work_sync(&cs35l56->sdw_irq_work);
+		flush_work(&cs35l56->sdw_irq_work);
 		sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);
 		sdw_read_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_STAT_1);
 		sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);
+		flush_work(&cs35l56->sdw_irq_work);
 	}
 
 	ret = cs35l56_mbox_send(cs35l56, CS35L56_MBOX_CMD_SHUTDOWN);