From 7f1c573d27de713310dcee77a75981ed83453a18 Mon Sep 17 00:00:00 2001 From: hselasky Date: Mon, 6 Oct 2014 06:08:29 +0000 Subject: [PATCH] MFC r272480: When we fail to get a USB reference we should just return, because there are no more references held. git-svn-id: svn://svn.freebsd.org/base/stable/8@272594 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- sys/dev/usb/usb_dev.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/sys/dev/usb/usb_dev.c b/sys/dev/usb/usb_dev.c index 04932b79b..391f62f87 100644 --- a/sys/dev/usb/usb_dev.c +++ b/sys/dev/usb/usb_dev.c @@ -293,6 +293,10 @@ error: } mtx_unlock(&usb_ref_lock); DPRINTFN(2, "fail\n"); + + /* clear all refs */ + memset(crd, 0, sizeof(*crd)); + return (USB_ERR_INVAL); } @@ -1079,8 +1083,8 @@ usb_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int fflag, struct thread* goto done; if (usb_usb_ref_device(cpd, &refs)) { - err = ENXIO; - goto done; + /* we lost the reference */ + return (ENXIO); } err = (f->methods->f_ioctl_post) (f, cmd, addr, fflags); @@ -1103,9 +1107,8 @@ usb_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int fflag, struct thread* while (usb_ref_device(cpd, &refs, 1 /* need uref */)) { if (usb_ref_device(cpd, &refs, 0)) { - /* device no longer exits */ - err = ENXIO; - goto done; + /* device no longer exists */ + return (ENXIO); } usb_unref_device(cpd, &refs); usb_pause_mtx(NULL, hz / 128); @@ -1241,9 +1244,9 @@ usb_read(struct cdev *dev, struct uio *uio, int ioflag) return (err); err = usb_ref_device(cpd, &refs, 0 /* no uref */ ); - if (err) { + if (err) return (ENXIO); - } + fflags = cpd->fflags; f = refs.rxfifo; @@ -1367,9 +1370,9 @@ usb_write(struct cdev *dev, struct uio *uio, int ioflag) return (err); err = usb_ref_device(cpd, &refs, 0 /* no uref */ ); - if (err) { + if (err) return (ENXIO); - } + fflags = cpd->fflags; f = refs.txfifo; -- 2.45.0