Cleaning up the loop in dwc3_cleanup_done_reqs() introduced a
gcc warning if built with "-Wmaybe-uninitialized":
drivers/usb/dwc3/gadget.c: In function 'dwc3_endpoint_transfer_complete':
drivers/usb/dwc3/gadget.c:2015:9: 'trb' may be used uninitialized in this
function [-Wmaybe-uninitialized]
I believe it is a false positive and we always have a valid 'trb'
pointer at the end of the function, but neither I nor the compiler
are able to prove that.
This works around the warning by computing a flag earlier in the function
when it's guaranteed to be valid, which tells the compiler that it's
safe and makes it easier to understand to me.
Signed-off-by: Arnd Bergmann <a...@arndb.de>
Fixes: 31162af447d7 ("usb: dwc3: gadget: avoid while (1) loop on completion")
---
drivers/usb/dwc3/gadget.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 7f4b48cf31aa..8456962e0a92 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1934,6 +1934,7 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc,
struct dwc3_ep *dep,
{
struct dwc3_request *req, *n;
struct dwc3_trb *trb;
+ bool ioc = false;
int ret;
list_for_each_entry_safe(req, n, &dep->started_list, list) {
@@ -1981,8 +1982,12 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc,
struct dwc3_ep *dep,
dwc3_gadget_giveback(dep, req, status);
- if (ret)
+ if (ret) {
+ if ((event->status & DEPEVT_STATUS_IOC) &&
+ (trb->ctrl & DWC3_TRB_CTRL_IOC))
+ ioc = true;
break;
+ }
}
/*
@@ -2010,10 +2015,9 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc,
struct dwc3_ep *dep,
return 1;
}
- if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
- if ((event->status & DEPEVT_STATUS_IOC) &&
- (trb->ctrl & DWC3_TRB_CTRL_IOC))
- return 0;
+ if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && ioc)
+ return 0;
+
return 1;
}
--
2.9.0
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