usb: dwc2: invalidate the dcache before starting the DMA

We should invalidate the dcache before starting the DMA. In case there are
any dirty lines from the DMA buffer in the cache, subsequent cache-line
replacements may corrupt the buffer in memory while the DMA is still going on.
Cache-line replacement can happen if the CPU tries to bring some other memory
locations into the cache while the DMA is going on.
Signed-off-by: NEddie Cai <eddie.cai.linux@gmail.com>
Reviewed-by: NStefan Brüns <stefan.bruens@rwth-aachen.de>

drivers/usb/host/dwc2.c

@@ -817,12 +817,19 @@ static int transfer_chunk(struct dwc2_hc_regs *hc_regs, void *aligned_buffer,
 	       (*pid << DWC2_HCTSIZ_PID_OFFSET),
 	       &hc_regs->hctsiz);
 
-	if (!in && xfer_len) {
-		memcpy(aligned_buffer, buffer, xfer_len);
-
-		flush_dcache_range((unsigned long)aligned_buffer,
-				   (unsigned long)aligned_buffer +
-				   roundup(xfer_len, ARCH_DMA_MINALIGN));
+	if (xfer_len) {
+		if (in) {
+			invalidate_dcache_range(
+					(uintptr_t)aligned_buffer,
+					(uintptr_t)aligned_buffer +
+					roundup(xfer_len, ARCH_DMA_MINALIGN));
+		} else {
+			memcpy(aligned_buffer, buffer, xfer_len);
+			flush_dcache_range(
+					(uintptr_t)aligned_buffer,
+					(uintptr_t)aligned_buffer +
+					roundup(xfer_len, ARCH_DMA_MINALIGN));
+		}
 	}
 
 	writel(phys_to_bus((unsigned long)aligned_buffer), &hc_regs->hcdma);