openwrt_lede/target/linux/brcm2708/patches-4.4/0206-dwc_otg-Don-t-free-qh-align-buffers-in-atomic-contex.patch

From 63c48596343f1431c898381a06629eef2719fbeb Mon Sep 17 00:00:00 2001
From: P33M <P33M@github.com>
Date: Fri, 18 Mar 2016 17:38:37 +0000
Subject: [PATCH] dwc_otg: Don't free qh align buffers in atomic context

---
 drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
@@ -56,6 +56,9 @@ void dwc_otg_hcd_qh_free(dwc_otg_hcd_t *
 {
 	dwc_otg_qtd_t *qtd, *qtd_tmp;
 	dwc_irqflags_t flags;
+	uint32_t buf_size = 0;
+	uint8_t *align_buf_virt = NULL;
+	dwc_dma_t align_buf_dma;
 
 	/* Free each QTD in the QTD list */
 	DWC_SPINLOCK_IRQSAVE(hcd->lock, &flags);
@@ -67,17 +70,19 @@ void dwc_otg_hcd_qh_free(dwc_otg_hcd_t *
 	if (hcd->core_if->dma_desc_enable) {
 		dwc_otg_hcd_qh_free_ddma(hcd, qh);
 	} else if (qh->dw_align_buf) {
-		uint32_t buf_size;
 		if (qh->ep_type == UE_ISOCHRONOUS) {
 			buf_size = 4096;
 		} else {
 			buf_size = hcd->core_if->core_params->max_transfer_size;
 		}
-		DWC_DMA_FREE(buf_size, qh->dw_align_buf, qh->dw_align_buf_dma);
+		align_buf_virt = qh->dw_align_buf;
+		align_buf_dma = qh->dw_align_buf_dma;
 	}
 
 	DWC_FREE(qh);
 	DWC_SPINUNLOCK_IRQRESTORE(hcd->lock, flags);
+	if (align_buf_virt)
+		DWC_DMA_FREE(buf_size, align_buf_virt, align_buf_dma);
 	return;
 }