From 47bff13cea8dd3e6ae869c3203723d93bd734637 Mon Sep 17 00:00:00 2001 From: Bandan Das Date: Fri, 20 Jul 2018 17:40:16 -0400 Subject: [PATCH] dev-mtp: add support for canceling transaction The initiator can choose to cancel an ongoing request which is specified by bRequest=0x64. If such a request arrives, free up any pending state Signed-off-by: Bandan Das Message-id: 20180720214020.22897-2-bsd@redhat.com Signed-off-by: Gerd Hoffmann --- hw/usb/dev-mtp.c | 30 ++++++++++++++++++++++++++---- 1 file changed, 26 insertions(+), 4 deletions(-) diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c index 1ded7ac9a3..c40b0de0bb 100644 --- a/hw/usb/dev-mtp.c +++ b/hw/usb/dev-mtp.c @@ -82,6 +82,7 @@ enum mtp_code { FMT_ASSOCIATION = 0x3001, /* event codes */ + EVT_CANCEL_TRANSACTION = 0x4001, EVT_OBJ_ADDED = 0x4002, EVT_OBJ_REMOVED = 0x4003, EVT_OBJ_INFO_CHANGED = 0x4007, @@ -1551,14 +1552,35 @@ static void usb_mtp_handle_control(USBDevice *dev, USBPacket *p, int length, uint8_t *data) { int ret; + MTPState *s = USB_MTP(dev); + uint16_t *event = (uint16_t *)data; - ret = usb_desc_handle_control(dev, p, request, value, index, length, data); - if (ret >= 0) { - return; + switch (request) { + case ClassInterfaceOutRequest | 0x64: + if (*event == EVT_CANCEL_TRANSACTION) { + g_free(s->result); + s->result = NULL; + usb_mtp_data_free(s->data_in); + s->data_in = NULL; + if (s->write_pending) { + g_free(s->dataset.filename); + s->write_pending = false; + } + usb_mtp_data_free(s->data_out); + s->data_out = NULL; + } else { + p->status = USB_RET_STALL; + } + break; + default: + ret = usb_desc_handle_control(dev, p, request, + value, index, length, data); + if (ret >= 0) { + return; + } } trace_usb_mtp_stall(dev->addr, "unknown control request"); - p->status = USB_RET_STALL; } static void usb_mtp_cancel_packet(USBDevice *dev, USBPacket *p)