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Another follow-up to r291460. Only access vp->v_rdev for VCHR vnodes

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in devfs_reclaim().

Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
Approved by:	re (gjb)
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2016-06-15 15:55:14 +00:00
parent 1201d0bc46
commit 2d5bba3ae3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=301928
1 changed files with 20 additions and 13 deletions
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33
sys/fs/devfs/devfs_vnops.c
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@ -1360,10 +1360,10 @@ devfs_readlink(struct vop_readlink_args *ap)
static int
devfs_reclaim(struct vop_reclaim_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vnode *vp;
struct devfs_dirent *de;
struct cdev *dev;
vp = ap->a_vp;
mtx_lock(&devfs_de_interlock);
de = vp->v_data;
if (de != NULL) {
@ -1371,24 +1371,31 @@ devfs_reclaim(struct vop_reclaim_args *ap)
vp->v_data = NULL;
}
mtx_unlock(&devfs_de_interlock);
vnode_destroy_vobject(vp);
return (0);
}
static int
devfs_reclaim_vchr(struct vop_reclaim_args *ap)
{
struct vnode *vp;
struct cdev *dev;
vp = ap->a_vp;
MPASS(vp->v_type == VCHR);
devfs_reclaim(ap);
VI_LOCK(vp);
dev_lock();
dev = vp->v_rdev;
vp->v_rdev = NULL;
if (dev == NULL) {
dev_unlock();
VI_UNLOCK(vp);
return (0);
}
dev->si_usecount -= vp->v_usecount;
if (dev != NULL)
dev->si_usecount -= vp->v_usecount;
dev_unlock();
VI_UNLOCK(vp);
dev_rel(dev);
if (dev != NULL)
dev_rel(dev);
return (0);
}
@ -1898,7 +1905,7 @@ static struct vop_vector devfs_specops = {
.vop_readdir = VOP_PANIC,
.vop_readlink = VOP_PANIC,
.vop_reallocblks = VOP_PANIC,
.vop_reclaim = devfs_reclaim,
.vop_reclaim = devfs_reclaim_vchr,
.vop_remove = devfs_remove,
.vop_rename = VOP_PANIC,
.vop_revoke = devfs_revoke,