ASoC: SOF: fix race in FW boot timeout handling

A race condition exists in handling firmware boot timeout.
If FW sends FW_READY just after boot timeout has expired in
driver, a kernel exception will result as FW_READY handler
will be run while the state is still being cleaned up in
snd_sof_run_firmware(). Avoid the race by setting
boot_complete also in the error case.
Signed-off-by: NKai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/sof/loader.c

@@ -372,6 +372,8 @@ int snd_sof_run_firmware(struct snd_sof_dev *sdev)
 				 msecs_to_jiffies(sdev->boot_timeout));
 	if (ret == 0) {
 		dev_err(sdev->dev, "error: firmware boot failure\n");
+		/* after this point FW_READY msg should be ignored */
+		sdev->boot_complete = true;
 		snd_sof_dsp_dbg_dump(sdev, SOF_DBG_REGS | SOF_DBG_MBOX |
 			SOF_DBG_TEXT | SOF_DBG_PCI);
 		return -EIO;