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xhci: allow disabling interrupters

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For secondary interrupters this is explicitly allowed in the specs.
For the primary interrupter behavior is undefined, lets be friendly
and allow disabling too.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-10-24 09:38:08 +02:00
parent 3f973ee84e
commit e099ad4b7e
1 changed files with 6 additions and 0 deletions
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6
hw/usb/hcd-xhci.c
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@ -964,6 +964,12 @@ static void xhci_er_reset(XHCIState *xhci, int v)
XHCIInterrupter *intr = &xhci->intr[v];
XHCIEvRingSeg seg;
if (intr->erstsz == 0) {
/* disabled */
intr->er_start = 0;
intr->er_size = 0;
return;
}
/* cache the (sole) event ring segment location */
if (intr->erstsz != 1) {
fprintf(stderr, "xhci: invalid value for ERSTSZ: %d\n", intr->erstsz);