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revision 1.142
    date: 2003/10/11 03:04:26;  author: toshii
    Fix a done list handling bug which exhibits under high shared
    interrupt rate and bus traffic.  As the interrupt register is
    read after checking hcca_done_head, there was a small chance
    of dropping a done list.  Ignore OHCI_WDH interrupt bit if
    hcca_done_head is zero so that OHCI_WDH is processed later.
This commit is contained in:
Josef Karthauser 2003-11-10 00:16:36 +00:00
parent 9c96cea538
commit f395d6798d
1 changed files with 2 additions and 1 deletions
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3
sys/dev/usb/ohci.c
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@ -3,6 +3,7 @@
/* Also, already ported:
* $NetBSD: ohci.c,v 1.140 2003/05/13 04:42:00 gson Exp $
* $NetBSD: ohci.c,v 1.141 2003/09/10 20:08:29 mycroft Exp $
* $NetBSD: ohci.c,v 1.142 2003/10/11 03:04:26 toshii Exp $
*/
#include <sys/cdefs.h>
@ -1180,7 +1181,7 @@ ohci_intr1(ohci_softc_t *sc)
}
sc->sc_hcca->hcca_done_head = 0;
} else
intrs = OREAD4(sc, OHCI_INTERRUPT_STATUS);
intrs = OREAD4(sc, OHCI_INTERRUPT_STATUS) & ~OHCI_WDH;
if (intrs == 0) /* nothing to be done (PCI shared interrupt) */
return (0);