60 static void vmcp_response_alloc(struct vmcp_session *session)  in vmcp_response_alloc()  argument
65 	order = get_order(session->bufsize);  in vmcp_response_alloc()
66 	nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT;  in vmcp_response_alloc()
75 		session->response = (char *)page_to_virt(page);  in vmcp_response_alloc()
76 		session->cma_alloc = 1;  in vmcp_response_alloc()
79 	session->response = (char *)__get_free_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, order);  in vmcp_response_alloc()
82 static void vmcp_response_free(struct vmcp_session *session)  in vmcp_response_free()  argument
87 	if (!session->response)  in vmcp_response_free()
89 	order = get_order(session->bufsize);  in vmcp_response_free()
90 	nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT;  in vmcp_response_free()
91 	if (session->cma_alloc) {  in vmcp_response_free()
92 		page = virt_to_page(session->response);  in vmcp_response_free()
94 		session->cma_alloc = 0;  in vmcp_response_free()
96 		free_pages((unsigned long)session->response, order);  in vmcp_response_free()
98 	session->response = NULL;  in vmcp_response_free()
103 	struct vmcp_session *session;  in vmcp_open()  local
108 	session = kmalloc(sizeof(*session), GFP_KERNEL);  in vmcp_open()
109 	if (!session)  in vmcp_open()
112 	session->bufsize = PAGE_SIZE;  in vmcp_open()
113 	session->response = NULL;  in vmcp_open()
114 	session->resp_size = 0;  in vmcp_open()
115 	mutex_init(&session->mutex);  in vmcp_open()
116 	file->private_data = session;  in vmcp_open()
122 	struct vmcp_session *session;  in vmcp_release()  local
124 	session = file->private_data;  in vmcp_release()
126 	vmcp_response_free(session);  in vmcp_release()
127 	kfree(session);  in vmcp_release()
136 	struct vmcp_session *session;  in vmcp_read()  local
138 	session = file->private_data;  in vmcp_read()
139 	if (mutex_lock_interruptible(&session->mutex))  in vmcp_read()
141 	if (!session->response) {  in vmcp_read()
142 		mutex_unlock(&session->mutex);  in vmcp_read()
145 	size = min_t(size_t, session->resp_size, session->bufsize);  in vmcp_read()
147 					session->response, size);  in vmcp_read()
149 	mutex_unlock(&session->mutex);  in vmcp_read()
159 	struct vmcp_session *session;  in vmcp_write()  local
166 	session = file->private_data;  in vmcp_write()
167 	if (mutex_lock_interruptible(&session->mutex)) {  in vmcp_write()
171 	if (!session->response)  in vmcp_write()
172 		vmcp_response_alloc(session);  in vmcp_write()
173 	if (!session->response) {  in vmcp_write()
174 		mutex_unlock(&session->mutex);  in vmcp_write()
179 	session->resp_size = cpcmd(cmd, session->response, session->bufsize,  in vmcp_write()
180 				   &session->resp_code);  in vmcp_write()
181 	mutex_unlock(&session->mutex);  in vmcp_write()
202 	struct vmcp_session *session;  in vmcp_ioctl()  local
206 	session = file->private_data;  in vmcp_ioctl()
211 	if (mutex_lock_interruptible(&session->mutex))  in vmcp_ioctl()
215 		ret = put_user(session->resp_code, argp);  in vmcp_ioctl()
218 		vmcp_response_free(session);  in vmcp_ioctl()
219 		ret = get_user(session->bufsize, argp);  in vmcp_ioctl()
221 			session->bufsize = PAGE_SIZE;  in vmcp_ioctl()
222 		if (!session->bufsize || get_order(session->bufsize) > 8) {  in vmcp_ioctl()
223 			session->bufsize = PAGE_SIZE;  in vmcp_ioctl()
228 		ret = put_user(session->resp_size, argp);  in vmcp_ioctl()
233 	mutex_unlock(&session->mutex);  in vmcp_ioctl()