usb-host optimizes away zero-length packets by not entering the
processing loop at all. Which isn't correct, we should submit a
zero-length urb to the host devicein that case. This patch makes
sure we run the processing loop at least once.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
hw/usb/host-linux.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/hw/usb/host-linux.c b/hw/usb/host-linux.c
index c3684c8..048f8ff 100644
--- a/hw/usb/host-linux.c
+++ b/hw/usb/host-linux.c
@@ -887,8 +887,8 @@ static int usb_host_handle_data(USBDevice *dev, USBPacket
*p)
prem = 0;
pbuf = NULL;
rem = p->iov.size;
- while (rem) {
- if (prem == 0) {
+ do {
+ if (prem == 0 && rem > 0) {
assert(v < p->iov.niov);
prem = p->iov.iov[v].iov_len;
pbuf = p->iov.iov[v].iov_base;
@@ -938,7 +938,7 @@ static int usb_host_handle_data(USBDevice *dev, USBPacket
*p)
return USB_RET_STALL;
}
}
- }
+ } while (rem > 0);
return USB_RET_ASYNC;
}
--
1.7.1
