This is a patch trying to fix a bug caused by usbredir. The problem is when usbredir failed to claim all interface of a USB device it won't set host->claimed to 0. After that, usbredirhost_release run by usbredirhost_close will detach kernel driver and do a device reset even some one is still using the USB device. Thus the second attempt will success because device is released already. Some buggy USB device will be unusable in such situation and require a replug.
To reproduce it:
1. launch a virtual machine and redirect a USB device to it
2. launch another virtual machine and redirect the same USB device to it，the spice client will show you a message of "Device is busy" means the device is already used by the virtual machine launched in step 1
3. do step 2 again, this time the same USB device will redirect successfully
We have tested it on the latest version of remote-viewer and virt-viewer.
On Wed, May 9, 2018 at 8:40 AM, Qiu Wenbo <qiuwenbo@xxxxxxxxxxxxxx> wrote:
You can redirect a USB device which is already redirected to another virtual machine on the second attempt. Signed-off-by: Qiu Wenbo <qiuwenbo@xxxxxxxxxxxxxx> --- usbredirhost/usbredirhost.c | 1 + 1 file changed, 1 insertion(+) diff --git a/usbredirhost/usbredirhost.c b/usbredirhost/usbredirhost.c index 3666227..e96d980 100644 --- a/usbredirhost/usbredirhost.c +++ b/usbredirhost/usbredirhost.c @@ -557,6 +557,7 @@ static int usbredirhost_claim(struct usbredirhost *host, int initial_claim) ERROR("could not claim interface %d (configuration %d): %s", n, host->config->bConfigurationValue, libusb_error_name(r)); + host->claimed = 0; return libusb_status_or_error_to_redir_status(host, r); } }--2.17.0 _______________________________________________ Spice-devel mailing list Spice-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/spice-devel
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