Author: hselasky
Date: Fri Jul 31 09:12:31 2015
New Revision: 286118
URL: https://svnweb.freebsd.org/changeset/base/286118
Log:
Limit the number of times we loop inside the DWC OTG poll handler to
avoid starving other fast interrupts. Fix a comment while at it.
MFC after: 1 week
Suggested by: Svatopluk Kraus <onw...@gmail.com>
Modified:
head/sys/dev/usb/controller/dwc_otg.c
Modified: head/sys/dev/usb/controller/dwc_otg.c
==============================================================================
--- head/sys/dev/usb/controller/dwc_otg.c Fri Jul 31 09:10:56 2015
(r286117)
+++ head/sys/dev/usb/controller/dwc_otg.c Fri Jul 31 09:12:31 2015
(r286118)
@@ -2551,12 +2551,18 @@ static void
dwc_otg_interrupt_poll_locked(struct dwc_otg_softc *sc)
{
struct usb_xfer *xfer;
+ uint32_t count = 0;
uint32_t temp;
uint8_t got_rx_status;
uint8_t x;
repeat:
- /* get all channel interrupts */
+ if (++count == 16) {
+ /* give other interrupts a chance */
+ DPRINTF("Yield\n");
+ return;
+ }
+ /* get all host channel interrupts */
for (x = 0; x != sc->sc_host_ch_max; x++) {
temp = DWC_OTG_READ_4(sc, DOTG_HCINT(x));
if (temp != 0) {
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