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xhci: Fix number of streams allocated when using streams

Message ID 1379343867-4285-1-git-send-email-hdegoede@redhat.com
State New
Headers show

Commit Message

Hans de Goede Sept. 16, 2013, 3:04 p.m. UTC 
According to the xhci spec the total number of streams is
2 ^ (MaxPStreams + 1), and this is also how the Linux xhci driver
uses this field.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 hw/usb/hcd-xhci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Gerd Hoffmann Sept. 16, 2013, 3:23 p.m. UTC | #1 
On Mo, 2013-09-16 at 17:04 +0200, Hans de Goede wrote:
> According to the xhci spec the total number of streams is
> 2 ^ (MaxPStreams + 1), and this is also how the Linux xhci driver
> uses this field.

Added to usb patch queue.

thanks,
  Gerd
diff mbox

Patch

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index f02231d..69d9144 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -1138,7 +1138,7 @@  static void xhci_reset_streams(XHCIEPContext *epctx)
 static void xhci_alloc_streams(XHCIEPContext *epctx, dma_addr_t base)
 {
     assert(epctx->pstreams == NULL);
-    epctx->nr_pstreams = 2 << epctx->max_pstreams;
+    epctx->nr_pstreams = 2 << (epctx->max_pstreams + 1);
     epctx->pstreams = xhci_alloc_stream_contexts(epctx->nr_pstreams, base);
 }