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bh=VbW5dAGjykzIBhl5ukmXUfXgvbqIXU0mt8/3b/qic5I=; b=cnEHAFTS7fk7rOAjSwhT3zpI52361eNh1xe6ZDntig7lCPL41xQa0X9CZnVX5GipgCKn/N pNJpxdQWSUXce8LdsejlqsFrdHgA9UOselU70t/25Z7slMitJ3XZ3r12+ieHV5yOQR4Jw7 7HYeikJsx4mN452b2wHxjn2emlWVuqM= X-MC-Unique: ORnHc6ETOnqYMB_DteQPnQ-1 From: P J P To: Gerd Hoffmann Subject: [PATCH v2 2/2] hw: usb: hcd-ohci: check for processed TD before retire Date: Tue, 15 Sep 2020 23:52:59 +0530 Message-Id: <20200915182259.68522-3-ppandit@redhat.com> In-Reply-To: <20200915182259.68522-1-ppandit@redhat.com> References: <20200915182259.68522-1-ppandit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=ppandit@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" From: Prasad J Pandit While servicing OHCI transfer descriptors(TD), ohci_service_iso_td retires a TD if it has passed its time frame. It does not check if the TD was already processed once and holds an error code in TD_CC. It may happen if the TD list has a loop. Add check to avoid an infinite loop condition. Signed-off-by: Prasad J Pandit Reviewed-by: Li Qiang --- hw/usb/hcd-ohci.c | 4 ++++ 1 file changed, 4 insertions(+) Update v2: one patch for loop issue -> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05145.html diff --git a/hw/usb/hcd-ohci.c b/hw/usb/hcd-ohci.c index 9dc59101f9..8b912e95d3 100644 --- a/hw/usb/hcd-ohci.c +++ b/hw/usb/hcd-ohci.c @@ -691,6 +691,10 @@ static int ohci_service_iso_td(OHCIState *ohci, struct= ohci_ed *ed, the next ISO TD of the same ED */ trace_usb_ohci_iso_td_relative_frame_number_big(relative_frame_num= ber, frame_count); + if (OHCI_CC_DATAOVERRUN =3D=3D OHCI_BM(iso_td.flags, TD_CC)) { + /* avoid infinite loop */ + return 1; + } OHCI_SET_BM(iso_td.flags, TD_CC, OHCI_CC_DATAOVERRUN); ed->head &=3D ~OHCI_DPTR_MASK; ed->head |=3D (iso_td.next & OHCI_DPTR_MASK); --=20 2.26.2