/* ASSERT:  channel is idle */
        if (dma_readl(dw, CH_EN) & dwc->mask) {
                dev_err(chan2dev(&dwc->chan),
-                       "BUG: Attempted to start non-idle channel\n");
+                       "%s: BUG: Attempted to start non-idle channel\n",
+                       __func__);
                dwc_dump_chan_regs(dwc);
 
                /* The tasklet will hopefully advance the queue... */
        /* Assert channel is idle */
        if (dma_readl(dw, CH_EN) & dwc->mask) {
                dev_err(chan2dev(&dwc->chan),
-                       "BUG: Attempted to start non-idle channel\n");
+                       "%s: BUG: Attempted to start non-idle channel\n",
+                       __func__);
                dwc_dump_chan_regs(dwc);
                spin_unlock_irqrestore(&dwc->lock, flags);
                return -EBUSY;