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-rw-r--r--sys/vm/vm_mmap.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c
index 8a496a6..f622d99 100644
--- a/sys/vm/vm_mmap.c
+++ b/sys/vm/vm_mmap.c
@@ -1160,6 +1160,7 @@ vm_mmap_vnode(struct thread *td, vm_size_t objsize,
void *handle;
vm_object_t obj;
struct mount *mp;
+ struct cdevsw *dsw;
int error, flags, type;
int vfslocked;
@@ -1190,13 +1191,19 @@ vm_mmap_vnode(struct thread *td, vm_size_t objsize,
type = OBJT_DEVICE;
handle = vp->v_rdev;
- /* XXX: lack thredref on device */
- if(vp->v_rdev->si_devsw->d_flags & D_MMAP_ANON) {
+ dsw = dev_refthread(handle);
+ if (dsw == NULL) {
+ error = ENXIO;
+ goto done;
+ }
+ if (dsw->d_flags & D_MMAP_ANON) {
+ dev_relthread(handle);
*maxprotp = VM_PROT_ALL;
*flagsp |= MAP_ANON;
error = 0;
goto done;
}
+ dev_relthread(handle);
/*
* cdevs does not provide private mappings of any kind.
*/
@@ -1273,16 +1280,21 @@ vm_mmap_cdev(struct thread *td, vm_size_t objsize,
struct cdev *cdev, vm_ooffset_t foff, vm_object_t *objp)
{
vm_object_t obj;
+ struct cdevsw *dsw;
int flags;
flags = *flagsp;
- /* XXX: lack thredref on device */
- if (cdev->si_devsw->d_flags & D_MMAP_ANON) {
+ dsw = dev_refthread(cdev);
+ if (dsw == NULL)
+ return (ENXIO);
+ if (dsw->d_flags & D_MMAP_ANON) {
+ dev_relthread(cdev);
*maxprotp = VM_PROT_ALL;
*flagsp |= MAP_ANON;
return (0);
}
+ dev_relthread(cdev);
/*
* cdevs does not provide private mappings of any kind.
*/
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