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X-Received-From: 2607:f8b0:4864:20::441 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Stefan Hajnoczi , qemu-devel@nongnu.org, Paul Zimmerman , John Snow , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The dwc-hsotg (dwc2) USB host depends on a short packet to indicate the end of an IN transfer. The usb-storage driver currently doesn't provide this, so fix it. I have tested this change rather extensively using a PC emulation with xhci, ehci, and uhci controllers, and have not observed any regressions. Signed-off-by: Paul Zimmerman --- hw/usb/dev-storage.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c index 5c4b57b06b..ae3c550042 100644 --- a/hw/usb/dev-storage.c +++ b/hw/usb/dev-storage.c @@ -229,6 +229,9 @@ static void usb_msd_copy_data(MSDState *s, USBPacket *p) usb_packet_copy(p, scsi_req_get_buf(s->req) + s->scsi_off, len); s->scsi_len -=3D len; s->scsi_off +=3D len; + if (len > s->data_len) { + len =3D s->data_len; + } s->data_len -=3D len; if (s->scsi_len =3D=3D 0 || s->data_len =3D=3D 0) { scsi_req_continue(s->req); @@ -303,6 +306,9 @@ static void usb_msd_command_complete(SCSIRequest *req, = uint32_t status, size_t r if (s->data_len) { int len =3D (p->iov.size - p->actual_length); usb_packet_skip(p, len); + if (len > s->data_len) { + len =3D s->data_len; + } s->data_len -=3D len; } if (s->data_len =3D=3D 0) { @@ -469,6 +475,9 @@ static void usb_msd_handle_data(USBDevice *dev, USBPack= et *p) int len =3D p->iov.size - p->actual_length; if (len) { usb_packet_skip(p, len); + if (len > s->data_len) { + len =3D s->data_len; + } s->data_len -=3D len; if (s->data_len =3D=3D 0) { s->mode =3D USB_MSDM_CSW; @@ -528,13 +537,17 @@ static void usb_msd_handle_data(USBDevice *dev, USBPa= cket *p) int len =3D p->iov.size - p->actual_length; if (len) { usb_packet_skip(p, len); + if (len > s->data_len) { + len =3D s->data_len; + } s->data_len -=3D len; if (s->data_len =3D=3D 0) { s->mode =3D USB_MSDM_CSW; } } } - if (p->actual_length < p->iov.size) { + if (p->actual_length < p->iov.size && (p->short_not_ok || + s->scsi_len >=3D p->ep->max_packet_size)) { DPRINTF("Deferring packet %p [wait data-in]\n", p); s->packet =3D p; p->status =3D USB_RET_ASYNC; --=20 2.17.1