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uhci.c:	-r1.124
    uhcireg.h:	-r1.13

	date: 2000/08/13 18:20:14;  author: augustss;  state: Exp;
	Fix race condition when unlinking xfers.  Thanks to IWAMOTO Toshihiro
	<iwamoto@sat.t.u-tokyo.ac.jp> for analyzing the problem and suggesting a fix.
	Fixes PR 10662.
This commit is contained in:
Josef Karthauser 2002-01-20 23:38:33 +00:00
parent 4b60693c3c
commit 519461f843
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=89597
2 changed files with 41 additions and 2 deletions
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35
sys/dev/usb/uhci.c
View File

@ -954,9 +954,23 @@ uhci_remove_hs_ctrl(uhci_softc_t *sc, uhci_soft_qh_t *sqh)
DPRINTFN(10, ("uhci_remove_hs_ctrl: sqh=%p\n", sqh));
uhci_rem_loop(sc);
/*
* The T bit should be set in the elink of the QH so that the HC
* doesn't follow the pointer. This condition may fail if the
* the transferred packet was short so that the QH still points
* at the last used TD.
* In this case we set the T bit and wait a little for the HC
* to stop looking at the TD.
*/
if (!(sqh->qh.qh_elink & htole32(UHCI_PTR_T))) {
sqh->qh.qh_elink = htole32(UHCI_PTR_T);
delay(UHCI_QH_REMOVE_DELAY);
}
pqh = uhci_find_prev_qh(sc->sc_hctl_start, sqh);
pqh->hlink = sqh->hlink;
pqh->qh.qh_hlink = sqh->qh.qh_hlink;
delay(UHCI_QH_REMOVE_DELAY);
if (sc->sc_hctl_end == sqh)
sc->sc_hctl_end = pqh;
}
@ -987,9 +1001,15 @@ uhci_remove_ls_ctrl(uhci_softc_t *sc, uhci_soft_qh_t *sqh)
SPLUSBCHECK;
DPRINTFN(10, ("uhci_remove_ls_ctrl: sqh=%p\n", sqh));
/* See comment in uhci_remove_hs_ctrl() */
if (!(sqh->qh.qh_elink & htole32(UHCI_PTR_T))) {
sqh->qh.qh_elink = htole32(UHCI_PTR_T);
delay(UHCI_QH_REMOVE_DELAY);
}
pqh = uhci_find_prev_qh(sc->sc_lctl_start, sqh);
pqh->hlink = sqh->hlink;
pqh->qh.qh_hlink = sqh->qh.qh_hlink;
delay(UHCI_QH_REMOVE_DELAY);
if (sc->sc_lctl_end == sqh)
sc->sc_lctl_end = pqh;
}
@ -1022,9 +1042,15 @@ uhci_remove_bulk(uhci_softc_t *sc, uhci_soft_qh_t *sqh)
DPRINTFN(10, ("uhci_remove_bulk: sqh=%p\n", sqh));
uhci_rem_loop(sc);
/* See comment in uhci_remove_hs_ctrl() */
if (!(sqh->qh.qh_elink & htole32(UHCI_PTR_T))) {
sqh->qh.qh_elink = htole32(UHCI_PTR_T);
delay(UHCI_QH_REMOVE_DELAY);
}
pqh = uhci_find_prev_qh(sc->sc_bulk_start, sqh);
pqh->hlink = sqh->hlink;
pqh->qh.qh_hlink = sqh->qh.qh_hlink;
delay(UHCI_QH_REMOVE_DELAY);
if (sc->sc_bulk_end == sqh)
sc->sc_bulk_end = pqh;
}
@ -2538,6 +2564,12 @@ uhci_remove_intr(uhci_softc_t *sc, int n, uhci_soft_qh_t *sqh)
DPRINTFN(4, ("uhci_remove_intr: n=%d sqh=%p\n", n, sqh));
/* See comment in uhci_remove_ctrl() */
if (!(sqh->qh.qh_elink & htole32(UHCI_PTR_T))) {
sqh->qh.qh_elink = htole32(UHCI_PTR_T);
delay(UHCI_QH_REMOVE_DELAY);
}
for (pqh = vf->hqh; pqh->hlink != sqh; pqh = pqh->hlink)
#if defined(DIAGNOSTIC) || defined(UHCI_DEBUG)
if (le32toh(pqh->qh.qh_hlink) & UHCI_PTR_T) {
@ -2549,6 +2581,7 @@ uhci_remove_intr(uhci_softc_t *sc, int n, uhci_soft_qh_t *sqh)
#endif
pqh->hlink = sqh->hlink;
pqh->qh.qh_hlink = sqh->qh.qh_hlink;
delay(UHCI_QH_REMOVE_DELAY);
if (vf->eqh == sqh)
vf->eqh = pqh;
vf->bandwidth--;
@ -3086,7 +3119,7 @@ uhci_root_ctrl_start(usbd_xfer_handle xfer)
delay(100);
x = UREAD2(sc, port);
UWRITE2(sc, port, x | UHCI_PORTSC_PE);
delay(100);
usb_delay_ms(&sc->sc_bus, 10); /* XXX */
DPRINTFN(3,("uhci port %d reset, status = 0x%04x\n",
index, UREAD2(sc, port)));
sc->sc_isreset = 1;

8
sys/dev/usb/uhcireg.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: usb/uhcireg.h,v 1.12 2000/07/23 19:43:38 augustss Exp $ */
/* $NetBSD: usb/uhcireg.h,v 1.13 2000/08/13 18:20:15 augustss Exp $ */
/* $FreeBSD$ */
/*
@ -121,6 +121,12 @@ typedef u_int32_t uhci_physaddr_t;
#define UHCI_PTR_QH 0x00000002
#define UHCI_PTR_VF 0x00000004
/*
* Wait this long after a QH has been removed. This gives that HC a
* chance to stop looking at it before it's recycled.
*/
#define UHCI_QH_REMOVE_DELAY 5
/*
* The Queue Heads and Transfer Descriptors are accessed
* by both the CPU and the USB controller which run