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usb: dwc3: gadget: avoid while (1) loop on completion

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We know that we have to iterate over the list of
started requests. Instead of looping forever, we can
rely on list_for_each_entry(). Likewise, instead of
a do {} while loop over all, maybe available,
scatterlist entries, we can detect if $this request
uses scatterlist and rely on for_each_sg().

This makes the code easier to follow while making
sure that we will *always* break out of the loop.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-08-11 14:38:37 +03:00
parent 08a36b5438
commit 31162af447
1 changed files with 19 additions and 13 deletions
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32
drivers/usb/dwc3/gadget.c
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@ -1926,31 +1926,37 @@ static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
const struct dwc3_event_depevt *event, int status)
{
struct dwc3_request *req;
struct dwc3_request *req, *n;
struct dwc3_trb *trb;
unsigned int i;
int count = 0;
int ret;
do {
list_for_each_entry_safe(req, n, &dep->started_list, list) {
int chain;
req = next_request(&dep->started_list);
if (!req)
return 1;
chain = req->request.num_mapped_sgs > 0;
i = 0;
do {
if (chain) {
struct scatterlist *sg = req->request.sg;
struct scatterlist *s;
unsigned int i;
for_each_sg(sg, s, req->request.num_mapped_sgs, i) {
trb = &dep->trb_pool[dep->trb_dequeue];
count += trb->size & DWC3_TRB_SIZE_MASK;
dwc3_ep_inc_deq(dep);
ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
event, status, chain);
}
} else {
trb = &dep->trb_pool[dep->trb_dequeue];
count += trb->size & DWC3_TRB_SIZE_MASK;
dwc3_ep_inc_deq(dep);
ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
event, status, chain);
if (ret)
break;
} while (++i < req->request.num_mapped_sgs);
}
/*
* We assume here we will always receive the entire data block
@ -1964,7 +1970,7 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
if (ret)
break;
} while (1);
}
/*
* Our endpoint might get disabled by another thread during