59 static void vmcp_response_alloc(struct vmcp_session *session)  in vmcp_response_alloc()  argument
64 	order = get_order(session->bufsize);  in vmcp_response_alloc()
65 	nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT;  in vmcp_response_alloc()
74 		session->response = (char *)page_to_virt(page);  in vmcp_response_alloc()
75 		session->cma_alloc = 1;  in vmcp_response_alloc()
78 	session->response = (char *)__get_free_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, order);  in vmcp_response_alloc()
81 static void vmcp_response_free(struct vmcp_session *session)  in vmcp_response_free()  argument
86 	if (!session->response)  in vmcp_response_free()
88 	order = get_order(session->bufsize);  in vmcp_response_free()
89 	nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT;  in vmcp_response_free()
90 	if (session->cma_alloc) {  in vmcp_response_free()
91 		page = virt_to_page(session->response);  in vmcp_response_free()
93 		session->cma_alloc = 0;  in vmcp_response_free()
95 		free_pages((unsigned long)session->response, order);  in vmcp_response_free()
97 	session->response = NULL;  in vmcp_response_free()
102 	struct vmcp_session *session;  in vmcp_open()  local
107 	session = kmalloc_obj(*session);  in vmcp_open()
108 	if (!session)  in vmcp_open()
111 	session->bufsize = PAGE_SIZE;  in vmcp_open()
112 	session->response = NULL;  in vmcp_open()
113 	session->resp_size = 0;  in vmcp_open()
114 	mutex_init(&session->mutex);  in vmcp_open()
115 	file->private_data = session;  in vmcp_open()
121 	struct vmcp_session *session;  in vmcp_release()  local
123 	session = file->private_data;  in vmcp_release()
125 	vmcp_response_free(session);  in vmcp_release()
126 	kfree(session);  in vmcp_release()
135 	struct vmcp_session *session;  in vmcp_read()  local
137 	session = file->private_data;  in vmcp_read()
138 	if (mutex_lock_interruptible(&session->mutex))  in vmcp_read()
140 	if (!session->response) {  in vmcp_read()
141 		mutex_unlock(&session->mutex);  in vmcp_read()
144 	size = min_t(size_t, session->resp_size, session->bufsize);  in vmcp_read()
146 					session->response, size);  in vmcp_read()
148 	mutex_unlock(&session->mutex);  in vmcp_read()
158 	struct vmcp_session *session;  in vmcp_write()  local
165 	session = file->private_data;  in vmcp_write()
166 	if (mutex_lock_interruptible(&session->mutex)) {  in vmcp_write()
170 	if (!session->response)  in vmcp_write()
171 		vmcp_response_alloc(session);  in vmcp_write()
172 	if (!session->response) {  in vmcp_write()
173 		mutex_unlock(&session->mutex);  in vmcp_write()
178 	session->resp_size = cpcmd(cmd, session->response, session->bufsize,  in vmcp_write()
179 				   &session->resp_code);  in vmcp_write()
180 	mutex_unlock(&session->mutex);  in vmcp_write()
201 	struct vmcp_session *session;  in vmcp_ioctl()  local
205 	session = file->private_data;  in vmcp_ioctl()
207 	if (mutex_lock_interruptible(&session->mutex))  in vmcp_ioctl()
211 		ret = put_user(session->resp_code, argp);  in vmcp_ioctl()
214 		vmcp_response_free(session);  in vmcp_ioctl()
215 		ret = get_user(session->bufsize, argp);  in vmcp_ioctl()
217 			session->bufsize = PAGE_SIZE;  in vmcp_ioctl()
218 		if (!session->bufsize || get_order(session->bufsize) > 8) {  in vmcp_ioctl()
219 			session->bufsize = PAGE_SIZE;  in vmcp_ioctl()
224 		ret = put_user(session->resp_size, argp);  in vmcp_ioctl()
229 	mutex_unlock(&session->mutex);  in vmcp_ioctl()