usb: dwc3: gadget: avoid while (1) loop on completion
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>
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 3cf4c90..c776fb7 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1926,31 +1926,37 @@
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 @@
if (ret)
break;
- } while (1);
+ }
/*
* Our endpoint might get disabled by another thread during