diff options
Diffstat (limited to 'drivers/misc/uacce/uacce.c')
| -rw-r--r-- | drivers/misc/uacce/uacce.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c index ffced4da3c2c..d39307f060bd 100644 --- a/drivers/misc/uacce/uacce.c +++ b/drivers/misc/uacce/uacce.c @@ -224,6 +224,7 @@ static int uacce_fops_open(struct inode *inode, struct file *filep) init_waitqueue_head(&q->wait); filep->private_data = q; + uacce->inode = inode; q->state = UACCE_Q_INIT; return 0; @@ -253,6 +254,14 @@ static int uacce_fops_release(struct inode *inode, struct file *filep) return 0; } +static vm_fault_t uacce_vma_fault(struct vm_fault *vmf) +{ + if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) + return VM_FAULT_SIGBUS; + + return 0; +} + static void uacce_vma_close(struct vm_area_struct *vma) { struct uacce_queue *q = vma->vm_private_data; @@ -265,6 +274,7 @@ static void uacce_vma_close(struct vm_area_struct *vma) } static const struct vm_operations_struct uacce_vm_ops = { + .fault = uacce_vma_fault, .close = uacce_vma_close, }; @@ -556,6 +566,12 @@ void uacce_remove(struct uacce_device *uacce) if (!uacce) return; + /* + * unmap remaining mapping from user space, preventing user still + * access the mmaped area while parent device is already removed + */ + if (uacce->inode) + unmap_mapping_range(uacce->inode->i_mapping, 0, 0, 1); /* ensure no open queue remains */ mutex_lock(&uacce->mm_lock); |