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| author | kib <kib@FreeBSD.org> | 2006-10-20 07:59:50 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2006-10-20 07:59:50 +0000 |
| commit | 5f5bf9dadc00a7cc8dc6b37e8abf10a23ced17f4 (patch) | |
| tree | 0c8a260910037a642d1dd98c671e553817da8b56 /sys/kern/kern_conf.c | |
| parent | 5b6bf7eb1c1469a528a6e28e72f035a6aed74314 (diff) | |
| download | FreeBSD-src-5f5bf9dadc00a7cc8dc6b37e8abf10a23ced17f4.zip FreeBSD-src-5f5bf9dadc00a7cc8dc6b37e8abf10a23ced17f4.tar.gz | |
Fix the race between devfs_fp_check and devfs_reclaim. Derefence the
vnode' v_rdev and increment the dev threadcount , as well as clear it
(in devfs_reclaim) under the dev_lock().
Reviewed by: tegge
Approved by: pjd (mentor)
Diffstat (limited to 'sys/kern/kern_conf.c')
| -rw-r--r-- | sys/kern/kern_conf.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c index d331d53..5520da8 100644 --- a/sys/kern/kern_conf.c +++ b/sys/kern/kern_conf.c @@ -125,6 +125,24 @@ dev_refthread(struct cdev *dev) return (csw); } +struct cdevsw * +devvn_refthread(struct vnode *vp, struct cdev **devp) +{ + struct cdevsw *csw; + + mtx_assert(&devmtx, MA_NOTOWNED); + csw = NULL; + dev_lock(); + *devp = vp->v_rdev; + if (*devp != NULL) { + csw = (*devp)->si_devsw; + if (csw != NULL) + (*devp)->si_threadcount++; + } + dev_unlock(); + return (csw); +} + void dev_relthread(struct cdev *dev) { |
