The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 23fd537c9508fb6e3b93ddf23982f51afc087781 Mon Sep 17 00:00:00 2001
From: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Date: Wed, 24 Aug 2016 14:33:27 +0300
Subject: [PATCH] usb: gadget: udc: core: don't starve DMA resources
Always unmap all SG entries as required by DMA API
Fixes: a698908d3b3b ("usb: gadget: add generic map/unmap request utilities")
Cc: <stable@xxxxxxxxxxxxxxx> # v3.4+
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 934f83881c30..40c04bb25f2f 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -827,7 +827,7 @@ void usb_gadget_unmap_request_by_dev(struct device *dev,
return;
if (req->num_mapped_sgs) {
- dma_unmap_sg(dev, req->sg, req->num_mapped_sgs,
+ dma_unmap_sg(dev, req->sg, req->num_sgs,
is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
req->num_mapped_sgs = 0;
--
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