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Index: sys/fs/devfs/devfs_vnops.c
===================================================================
--- sys/fs/devfs/devfs_vnops.c
+++ sys/fs/devfs/devfs_vnops.c
@@ -120,9 +120,8 @@
devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
int *ref)
{
-
*dswp = devvn_refthread(fp->f_vnode, devp, ref);
- if (*devp != fp->f_data) {
+ if (*dswp == NULL || *devp != fp->f_data) {
if (*dswp != NULL)
dev_relthread(*devp, *ref);
return (ENXIO);

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