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| author | hselasky <hselasky@FreeBSD.org> | 2015-07-31 09:12:31 +0000 |
|---|---|---|
| committer | hselasky <hselasky@FreeBSD.org> | 2015-07-31 09:12:31 +0000 |
| commit | 2e11d7935d8d37d737afe0b8fea3b776e459b12a (patch) | |
| tree | 2ad014af828b718db56dcbd4f1804469a36c7095 | |
| parent | e9ba3ff9a656a10a4fb04bcb596db3639affb2cd (diff) | |
| download | FreeBSD-src-2e11d7935d8d37d737afe0b8fea3b776e459b12a.zip FreeBSD-src-2e11d7935d8d37d737afe0b8fea3b776e459b12a.tar.gz | |
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 <onwahe@gmail.com>
| -rw-r--r-- | sys/dev/usb/controller/dwc_otg.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/dev/usb/controller/dwc_otg.c b/sys/dev/usb/controller/dwc_otg.c index 51f083b..bd3e51b 100644 --- a/sys/dev/usb/controller/dwc_otg.c +++ b/sys/dev/usb/controller/dwc_otg.c @@ -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) { |
