uacce: unmap remaining mmapping from user space (acc670db) · Commits · 戴 / test

drivers/misc/uacce/uacce.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -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);

+2 −0

Original line number	Diff line number	Diff line
		@@ -98,6 +98,7 @@ struct uacce_queue {
		* @priv: private pointer of the uacce
		* @mm_list: list head of uacce_mm->list
		* @mm_lock: lock for mm_list
		* @inode: core vfs
		*/
		struct uacce_device {
		const char *algs;
		@@ -113,6 +114,7 @@ struct uacce_device {
		void *priv;
		struct list_head mm_list;
		struct mutex mm_lock;
		struct inode *inode;
		};

		/**