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usb: ci_udc: parse QTD before over-writing it 

ci_udc only allocates a single QTD structure per EP. All data needs to be
extracted from the DTD prior to calling ci_ep_submit_next_request(), since
that fills the QTD with next transaction's parameters. Fix
handle_ep_complete() to extract the transaction (remaining) length before
kicking off the next transaction.

In practice, this only causes writes to UMS devices to fail for me. I may
have tested the final versions of my previous ci_udc patch only with
reads. More recently, I had patches applied locally that allocated a QTD
per USB request rather than per USB EP, although since that doesn't give
any performance benefit, I'm dropping those.

Fixes: 2813006fec ("usb: ci_udc: allow multiple buffer allocs per ep")
Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Stephen Warren 2014-05-13 10:51:54 -06:00 committed by Marek Vasut
parent a4539a2aa7
commit 8630c1c7e3
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/ci_udc.c
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@ -424,6 +424,7 @@ static void handle_ep_complete(struct ci_ep *ep)
item = ci_get_qtd(num, in);
ci_invalidate_qtd(num);
len = (item->info >> 16) & 0x7fff;
if (item->info & 0xff)
printf("EP%d/%s FAIL info=%x pg0=%x\n",
num, in ? "in" : "out", item->info, item->page0);
@ -435,7 +436,6 @@ static void handle_ep_complete(struct ci_ep *ep)
if (!list_empty(&ep->queue))
ci_ep_submit_next_request(ep);
len = (item->info >> 16) & 0x7fff;
ci_req->req.actual = ci_req->req.length - len;
ci_debounce(ci_req, in);