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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 <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2010-12-09 23:31:49 +01:00
parent ab4797ad2e
commit fa7935c1e1
1 changed files with 2 additions and 2 deletions
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4
hw/usb-msd.c
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@ -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;