spin_lock_irqsave(&host->lock, flags);
 
        hs400_tuning = host->flags & SDHCI_HS400_TUNING;
-       host->flags &= ~SDHCI_HS400_TUNING;
 
        if (host->tuning_mode == SDHCI_TUNING_MODE_1)
                tuning_count = host->tuning_count;
 
        if (host->ops->platform_execute_tuning) {
                spin_unlock_irqrestore(&host->lock, flags);
-               return host->ops->platform_execute_tuning(host, opcode);
+               err = host->ops->platform_execute_tuning(host, opcode);
+               spin_lock_irqsave(&host->lock, flags);
+               goto out_unlock;
        }
 
        host->mmc->retune_period = tuning_count;
 
        sdhci_end_tuning(host);
 out_unlock:
+       host->flags &= ~SDHCI_HS400_TUNING;
        spin_unlock_irqrestore(&host->lock, flags);
 
        return err;