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Add sysctl to not reset the device on clear stall failures, to

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temporarily mitigate problems with VMs.

Approved by:    re (kib)
MFC after:      1 week
This commit is contained in:
Hans Petter Selasky 2011-08-19 09:01:34 +00:00
parent 311fa10b52
commit 9465dbeb5c
1 changed files with 13 additions and 1 deletions
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14
sys/dev/usb/usb_request.c
View file

@ -67,6 +67,11 @@
#include <dev/usb/usb_bus.h>
#include <sys/ctype.h>
static int usb_no_cs_fail;
SYSCTL_INT(_hw_usb, OID_AUTO, no_cs_fail, CTLFLAG_RW,
&usb_no_cs_fail, 0, "USB clear stall failures are ignored, if set");
#ifdef USB_DEBUG
static int usb_pr_poll_delay = USB_PORT_RESET_DELAY;
static int usb_pr_recovery_delay = USB_PORT_RESET_RECOVERY;
@ -238,7 +243,7 @@ usb_do_clear_stall_callback(struct usb_xfer *xfer, usb_error_t error)
switch (USB_GET_STATE(xfer)) {
case USB_ST_TRANSFERRED:
tr_transferred:
/* reset error counter */
udev->clear_stall_errors = 0;
@ -297,6 +302,13 @@ tr_setup:
break;
DPRINTF("Clear stall failed.\n");
/*
* Some VMs like VirtualBox always return failure on
* clear-stall which we sometimes should just ignore.
*/
if (usb_no_cs_fail)
goto tr_transferred;
if (udev->clear_stall_errors == USB_CS_RESET_LIMIT)
goto tr_setup;