[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [BUG] -usb makes qemu fight against linux
From: |
Paul Bolle |
Subject: |
Re: [Qemu-devel] [BUG] -usb makes qemu fight against linux |
Date: |
Fri, 24 Apr 2009 12:05:53 +0200 |
On Fri, 2009-03-06 at 09:54 +0100, Stan Behrens wrote:
> when you add a bluetooth-dongle, usb-flash-drive or something like that via:
> usb_add host:2.23
> to you're guest-OS, qemu starts to fight against the linux-usb-configuration.
>
> qemu's output looks like this:
> husb: open device 2.32
> husb: config #1 need -1
> husb: 1 interfaces claimed for configuration 1
> husb: grabbed usb device 2.32
> husb: config #1 need 1
> husb: 1 interfaces claimed for configuration 1
> husb: config #1 need 1
> husb: 1 interfaces claimed for configuration 1
> husb: config #1 need 1
> husb: 1 interfaces claimed for configuration 1
> husb: config #1 need 1
> husb: 1 interfaces claimed for configuration 1
>
> And '# dmesg' says:
> [12929.001037] usb 2-3: reset high speed USB device using ehci_hcd and
> address 32
> [12929.782032] usb 2-3: reset high speed USB device using ehci_hcd and
> address 32
> [12930.176041] usb 2-3: reset high speed USB device using ehci_hcd and
> address 32
> [12930.726032] usb 2-3: reset high speed USB device using ehci_hcd and
> address 32
This seems related to this discussion:
http://lists.gnu.org/archive/html/qemu-devel/2008-10/msg01320.html (in a
thread regarding a preliminary patch to implement ehci).
Could you try the following patch? It was created after finally
discovering the discussion mentioned above (which I hardly understand,
which in turn leads to an impressive, but possibly nonsensical commit
message for this patch). It seems to fix a similar issue I ran into
(while trying some advanced feature of a USB memory stick I happen to
have.)
Paul Bolle
---
[PATCH] usb-linux: use USB_RET_STALL on -EPIPE URB status
If ioctl([...], USBDEVFS_REAPURBNDELAY, [...]) sets the URB status to
-EPIPE use USB_RET_STALL (and not USB_RET_NAK). USB_RET_NAK can confuse
guests and seems to trigger some guests to repeatedly request port
resets, which slows down (or even blocks) USB operations.
Signed-off-by: Paul Bolle <address@hidden>
---
usb-linux.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/usb-linux.c b/usb-linux.c
index 70d7a1c..80ef6fc 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -277,7 +277,7 @@ static void async_complete(void *opaque)
set_halt(s, p->devep);
/* fall through */
default:
- p->len = USB_RET_NAK;
+ p->len = USB_RET_STALL;
break;
}
--
1.6.2.2
- Re: [Qemu-devel] [BUG] -usb makes qemu fight against linux,
Paul Bolle <=