From fa7935c1e1f84b600fcb1983485352b8d99e01d3 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Thu, 9 Dec 2010 23:31:49 +0100 Subject: [PATCH] usb storage: handle long responses The scsi layer may return us more data than the guests wants to have. Handle this by just ignoring the extra bytes and calling the {read,write}_data callback to finish the request. Seen happening in real life with some extended inquiry command. With this patch applied the linux kernel stops reseting the device once at boot. Signed-off-by: Gerd Hoffmann --- hw/usb-msd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/usb-msd.c b/hw/usb-msd.c index 28c12dd632..729d96ccc3 100644 --- a/hw/usb-msd.c +++ b/hw/usb-msd.c @@ -187,7 +187,7 @@ static void usb_msd_copy_data(MSDState *s) s->usb_buf += len; s->scsi_buf += len; s->data_len -= len; - if (s->scsi_len == 0) { + if (s->scsi_len == 0 || s->data_len == 0) { if (s->mode == USB_MSDM_DATAIN) { s->scsi_dev->info->read_data(s->scsi_dev, s->tag); } else if (s->mode == USB_MSDM_DATAOUT) { @@ -434,7 +434,7 @@ static int usb_msd_handle_data(USBDevice *dev, USBPacket *p) break; case USB_MSDM_DATAIN: - DPRINTF("Data in %d/%d\n", len, s->data_len); + DPRINTF("Data in %d/%d, scsi_len %d\n", len, s->data_len, s->scsi_len); if (len > s->data_len) len = s->data_len; s->usb_buf = data;