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usb-host: fix zero-length packets 

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 <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-04-19 13:36:40 +02:00
parent 818d59dc17
commit 0b377169b1
1 changed files with 3 additions and 3 deletions
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6
hw/usb/host-linux.c
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@ -887,8 +887,8 @@ static int usb_host_handle_data(USBDevice *dev, USBPacket *p)
prem = 0; prem = 0;
pbuf = NULL; pbuf = NULL;
rem = p->iov.size; rem = p->iov.size;
while (rem) { do {
if (prem == 0) { if (prem == 0 && rem > 0) {
assert(v < p->iov.niov); assert(v < p->iov.niov);
prem = p->iov.iov[v].iov_len; prem = p->iov.iov[v].iov_len;
pbuf = p->iov.iov[v].iov_base; 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; return USB_RET_STALL;
} }
} }
} } while (rem > 0);
return USB_RET_ASYNC; return USB_RET_ASYNC;
} }