Date: Tue, 6 Mar 2007 13:54:02 +1100 (EST) From: Maurice Castro <maurice@sphinx.clari.net.au> To: FreeBSD-gnats-submit@FreeBSD.org Subject: usb/109959: usb_interrupt_read does not respect timeout Message-ID: <200703060254.l262s2Yt026721@sphinx.clari.net.au> Resent-Message-ID: <200703060320.l263K8aG003437@freefall.freebsd.org>
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>Number: 109959
>Category: usb
>Synopsis: usb_interrupt_read does not respect timeout
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-usb
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Tue Mar 06 03:20:08 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator: Maurice Castro
>Release: FreeBSD 5.4-RELEASE i386
>Organization:
Clarinet Internet Solutions
>Environment:
System: FreeBSD sphinx.clari.net.au 5.4-RELEASE FreeBSD 5.4-RELEASE #1: Wed Nov 30 11:05:23 EST 2005 mjb@sphinx.clari.net.au:/work/src/sys/i386/compile/sphinx i386
All version of FreeBSD (and other BSDs) since 5.4 (possibly earlier)
>Description:
Requesting a timeout on usb_interrupt_read has no effect. This results in
hanging reads for libusb.
>How-To-Repeat:
In particular, the port sysutils/nut-usb will hang on initialising
a Powerware 3105 UPS.
>Fix:
--- ugen.c.orig Tue Mar 6 13:36:15 2007
+++ ugen.c Tue Mar 6 09:56:20 2007
@@ -740,11 +740,17 @@
}
sce->state |= UGEN_ASLP;
DPRINTFN(5, ("ugenread: sleep on %p\n", sce));
- error = tsleep(sce, PZERO | PCATCH, "ugenri", 0);
+ error = tsleep(sce, PZERO | PCATCH, "ugenri", sce->timeout);
sce->state &= ~UGEN_ASLP;
DPRINTFN(5, ("ugenread: woke, error=%d\n", error));
if (sc->sc_dying)
error = EIO;
+ /* we timed out - return 0 bytes */
+ if (error == EAGAIN)
+ {
+ error = 0;
+ break;
+ }
if (error)
break;
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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