From: Gregory Herrero <gregory.herrero@xxxxxxxxx>
Align buffer must be allocated using kmalloc since irqs are disabled.
Coherency is handled through dma_map_single which can be used with irqs
disabled.
Signed-off-by: Gregory Herrero <gregory.herrero@xxxxxxxxx>
---
drivers/usb/dwc2/hcd.c | 7 ++++---
drivers/usb/dwc2/hcd_intr.c | 10 ++++++++++
drivers/usb/dwc2/hcd_queue.c | 7 ++++---
3 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 011b679..7ebf6cc 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -710,9 +710,7 @@ static int dwc2_hc_setup_align_buf(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
/* 3072 = 3 max-size Isoc packets */
buf_size = 3072;
- qh->dw_align_buf = dma_alloc_coherent(hsotg->dev, buf_size,
- &qh->dw_align_buf_dma,
- GFP_ATOMIC);
+ qh->dw_align_buf = kzalloc(buf_size, GFP_ATOMIC);
if (!qh->dw_align_buf)
return -ENOMEM;
qh->dw_align_buf_size = buf_size;
@@ -737,6 +735,9 @@ static int dwc2_hc_setup_align_buf(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
}
}
+ qh->dw_align_buf_dma = dma_map_single(hsotg->dev,
+ qh->dw_align_buf, qh->dw_align_buf_size, DMA_TO_DEVICE);
+
chan->align_buf = qh->dw_align_buf_dma;
return 0;
}
diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
index 6927bba..600f5ba 100644
--- a/drivers/usb/dwc2/hcd_intr.c
+++ b/drivers/usb/dwc2/hcd_intr.c
@@ -467,6 +467,8 @@ static int dwc2_update_urb_state(struct dwc2_hsotg *hsotg,
/* Non DWORD-aligned buffer case handling */
if (chan->align_buf && xfer_length && chan->ep_is_in) {
+ dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
+ chan->qh->dw_align_buf_size, DMA_FROM_DEVICE);
dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n", __func__);
memcpy(urb->buf + urb->actual_length, chan->qh->dw_align_buf,
xfer_length);
@@ -559,6 +561,8 @@ static enum dwc2_halt_status dwc2_update_isoc_urb_state(
chan->ep_is_in) {
dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n",
__func__);
+ dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
+ chan->qh->dw_align_buf_size, DMA_FROM_DEVICE);
memcpy(urb->buf + frame_desc->offset +
qtd->isoc_split_offset, chan->qh->dw_align_buf,
frame_desc->actual_length);
@@ -588,6 +592,8 @@ static enum dwc2_halt_status dwc2_update_isoc_urb_state(
chan->ep_is_in) {
dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n",
__func__);
+ dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
+ chan->qh->dw_align_buf_size, DMA_FROM_DEVICE);
memcpy(urb->buf + frame_desc->offset +
qtd->isoc_split_offset, chan->qh->dw_align_buf,
frame_desc->actual_length);
@@ -926,6 +932,8 @@ static int dwc2_xfercomp_isoc_split_in(struct dwc2_hsotg *hsotg,
if (chan->align_buf) {
dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n", __func__);
+ dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
+ chan->qh->dw_align_buf_size, DMA_FROM_DEVICE);
memcpy(qtd->urb->buf + frame_desc->offset +
qtd->isoc_split_offset, chan->qh->dw_align_buf, len);
}
@@ -1155,6 +1163,8 @@ static void dwc2_update_urb_state_abn(struct dwc2_hsotg *hsotg,
/* Non DWORD-aligned buffer case handling */
if (chan->align_buf && xfer_length && chan->ep_is_in) {
dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n", __func__);
+ dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
+ chan->qh->dw_align_buf_size, DMA_FROM_DEVICE);
memcpy(urb->buf + urb->actual_length, chan->qh->dw_align_buf,
xfer_length);
}
diff --git a/drivers/usb/dwc2/hcd_queue.c b/drivers/usb/dwc2/hcd_queue.c
index 02103b66..5f206ab 100644
--- a/drivers/usb/dwc2/hcd_queue.c
+++ b/drivers/usb/dwc2/hcd_queue.c
@@ -231,9 +231,10 @@ void dwc2_hcd_qh_free(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
{
if (hsotg->core_params->dma_desc_enable > 0)
dwc2_hcd_qh_free_ddma(hsotg, qh);
- else if (qh->dw_align_buf)
- dma_free_coherent(hsotg->dev, qh->dw_align_buf_size,
- qh->dw_align_buf, qh->dw_align_buf_dma);
+ else {
+ kfree(qh->dw_align_buf);
+ qh->dw_align_buf_dma = (dma_addr_t)0;
+ }
kfree(qh);
}
--
1.9.1
--
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