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+ Fix another possible vn_close race, in the same fashion as r1.95.

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+ Check that the cached vnode type != VBAD before calling devsw(),
   this can happen if the vnode has been revoked.
This commit is contained in:
Jonathan Lemon 2001-11-02 17:04:32 +00:00
parent 5fab7614f4
commit 198475ebeb
1 changed files with 6 additions and 5 deletions
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11
sys/kern/tty_cons.c
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@ -334,17 +334,18 @@ static int
cn_devopen(struct cn_device *cnd, struct thread *td, int forceopen)
{
char path[CNDEVPATHMAX];
struct nameidata nd;
struct nameidata nd;
struct vnode *vp;
dev_t dev;
int error;
if (cnd->cnd_vp != NULL) {
if (!forceopen) {
dev = cnd->cnd_vp->v_rdev;
if ((vp = cnd->cnd_vp) != NULL) {
if (!forceopen && vp->v_type != VBAD) {
dev = vp->v_rdev;
return ((*devsw(dev)->d_open)(dev, openflag, 0, td));
}
vn_close(cnd->cnd_vp, openflag, td->td_proc->p_ucred, td);
cnd->cnd_vp = NULL;
vn_close(vp, openflag, td->td_proc->p_ucred, td);
}
if (cnd->cnd_name[0] == '\0')
strncpy(cnd->cnd_name, devtoname(cnd->cnd_cn->cn_dev),