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Merge "usb: dwc3: gadget: Update chain bit correctly when using sg list"

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qctecmdr 2019-10-11 17:10:22 -07:00 • committed by Gerrit - the friendly Code Review server
commit 4ac4ea5987
1 changed files with 8 additions and 1 deletions
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9
drivers/usb/dwc3/gadget.c
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@ -1062,7 +1062,14 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
unsigned int rem = length % maxp;
unsigned chain = true;
if (sg_is_last(s))
/*
* IOMMU driver is clubbing the list of sgs which shares a page
* boundary into one and giving it to USB driver. With this the
* number of sgs mapped it not equal to the the number of sgs
* passed. Mark the chain bit to false if it is the last mapped
* sg.
*/
if (sg_is_last(s) || (i == remaining - 1))
chain = false;
if (rem && usb_endpoint_dir_out(dep->endpoint.desc) && !chain) {