| /* |
| * |
| * Intel Management Engine Interface (Intel MEI) Linux driver |
| * Copyright (c) 2003-2012, Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/fs.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/fcntl.h> |
| #include <linux/aio.h> |
| #include <linux/pci.h> |
| #include <linux/ioctl.h> |
| #include <linux/cdev.h> |
| #include <linux/list.h> |
| #include <linux/delay.h> |
| #include <linux/sched.h> |
| #include <linux/uuid.h> |
| #include <linux/jiffies.h> |
| #include <linux/uaccess.h> |
| |
| #include <linux/mei.h> |
| |
| #include "mei_dev.h" |
| #include "hbm.h" |
| #include "hw-me.h" |
| #include "client.h" |
| |
| const uuid_le mei_amthif_guid = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d, |
| 0xac, 0xa8, 0x46, 0xe0, |
| 0xff, 0x65, 0x81, 0x4c); |
| |
| /** |
| * mei_amthif_reset_params - initializes mei device iamthif |
| * |
| * @dev: the device structure |
| */ |
| void mei_amthif_reset_params(struct mei_device *dev) |
| { |
| /* reset iamthif parameters. */ |
| dev->iamthif_current_cb = NULL; |
| dev->iamthif_msg_buf_size = 0; |
| dev->iamthif_msg_buf_index = 0; |
| dev->iamthif_canceled = false; |
| dev->iamthif_ioctl = false; |
| dev->iamthif_state = MEI_IAMTHIF_IDLE; |
| dev->iamthif_timer = 0; |
| dev->iamthif_stall_timer = 0; |
| dev->iamthif_open_count = 0; |
| } |
| |
| /** |
| * mei_amthif_host_init - mei initialization amthif client. |
| * |
| * @dev: the device structure |
| * |
| */ |
| int mei_amthif_host_init(struct mei_device *dev) |
| { |
| struct mei_cl *cl = &dev->iamthif_cl; |
| unsigned char *msg_buf; |
| int ret, i; |
| |
| dev->iamthif_state = MEI_IAMTHIF_IDLE; |
| |
| mei_cl_init(cl, dev); |
| |
| i = mei_me_cl_by_uuid(dev, &mei_amthif_guid); |
| if (i < 0) { |
| ret = i; |
| dev_info(&dev->pdev->dev, |
| "amthif: failed to find the client %d\n", ret); |
| return ret; |
| } |
| |
| cl->me_client_id = dev->me_clients[i].client_id; |
| |
| /* Assign iamthif_mtu to the value received from ME */ |
| |
| dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length; |
| dev_dbg(&dev->pdev->dev, "IAMTHIF_MTU = %d\n", |
| dev->me_clients[i].props.max_msg_length); |
| |
| kfree(dev->iamthif_msg_buf); |
| dev->iamthif_msg_buf = NULL; |
| |
| /* allocate storage for ME message buffer */ |
| msg_buf = kcalloc(dev->iamthif_mtu, |
| sizeof(unsigned char), GFP_KERNEL); |
| if (!msg_buf) { |
| dev_err(&dev->pdev->dev, "amthif: memory allocation for ME message buffer failed.\n"); |
| return -ENOMEM; |
| } |
| |
| dev->iamthif_msg_buf = msg_buf; |
| |
| ret = mei_cl_link(cl, MEI_IAMTHIF_HOST_CLIENT_ID); |
| |
| if (ret < 0) { |
| dev_err(&dev->pdev->dev, |
| "amthif: failed link client %d\n", ret); |
| return ret; |
| } |
| |
| cl->state = MEI_FILE_CONNECTING; |
| |
| ret = mei_cl_connect(cl, NULL); |
| |
| dev->iamthif_state = MEI_IAMTHIF_IDLE; |
| |
| return ret; |
| } |
| |
| /** |
| * mei_amthif_find_read_list_entry - finds a amthilist entry for current file |
| * |
| * @dev: the device structure |
| * @file: pointer to file object |
| * |
| * returns returned a list entry on success, NULL on failure. |
| */ |
| struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev, |
| struct file *file) |
| { |
| struct mei_cl_cb *cb; |
| |
| list_for_each_entry(cb, &dev->amthif_rd_complete_list.list, list) { |
| if (cb->cl && cb->cl == &dev->iamthif_cl && |
| cb->file_object == file) |
| return cb; |
| } |
| return NULL; |
| } |
| |
| |
| /** |
| * mei_amthif_read - read data from AMTHIF client |
| * |
| * @dev: the device structure |
| * @if_num: minor number |
| * @file: pointer to file object |
| * @*ubuf: pointer to user data in user space |
| * @length: data length to read |
| * @offset: data read offset |
| * |
| * Locking: called under "dev->device_lock" lock |
| * |
| * returns |
| * returned data length on success, |
| * zero if no data to read, |
| * negative on failure. |
| */ |
| int mei_amthif_read(struct mei_device *dev, struct file *file, |
| char __user *ubuf, size_t length, loff_t *offset) |
| { |
| int rets; |
| int wait_ret; |
| struct mei_cl_cb *cb = NULL; |
| struct mei_cl *cl = file->private_data; |
| unsigned long timeout; |
| int i; |
| |
| /* Only possible if we are in timeout */ |
| if (!cl || cl != &dev->iamthif_cl) { |
| dev_dbg(&dev->pdev->dev, "bad file ext.\n"); |
| return -ETIMEDOUT; |
| } |
| |
| i = mei_me_cl_by_id(dev, dev->iamthif_cl.me_client_id); |
| |
| if (i < 0) { |
| dev_dbg(&dev->pdev->dev, "amthif client not found.\n"); |
| return -ENODEV; |
| } |
| dev_dbg(&dev->pdev->dev, "checking amthif data\n"); |
| cb = mei_amthif_find_read_list_entry(dev, file); |
| |
| /* Check for if we can block or not*/ |
| if (cb == NULL && file->f_flags & O_NONBLOCK) |
| return -EAGAIN; |
| |
| |
| dev_dbg(&dev->pdev->dev, "waiting for amthif data\n"); |
| while (cb == NULL) { |
| /* unlock the Mutex */ |
| mutex_unlock(&dev->device_lock); |
| |
| wait_ret = wait_event_interruptible(dev->iamthif_cl.wait, |
| (cb = mei_amthif_find_read_list_entry(dev, file))); |
| |
| /* Locking again the Mutex */ |
| mutex_lock(&dev->device_lock); |
| |
| if (wait_ret) |
| return -ERESTARTSYS; |
| |
| dev_dbg(&dev->pdev->dev, "woke up from sleep\n"); |
| } |
| |
| |
| dev_dbg(&dev->pdev->dev, "Got amthif data\n"); |
| dev->iamthif_timer = 0; |
| |
| if (cb) { |
| timeout = cb->read_time + |
| mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER); |
| dev_dbg(&dev->pdev->dev, "amthif timeout = %lud\n", |
| timeout); |
| |
| if (time_after(jiffies, timeout)) { |
| dev_dbg(&dev->pdev->dev, "amthif Time out\n"); |
| /* 15 sec for the message has expired */ |
| list_del(&cb->list); |
| rets = -ETIMEDOUT; |
| goto free; |
| } |
| } |
| /* if the whole message will fit remove it from the list */ |
| if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset)) |
| list_del(&cb->list); |
| else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) { |
| /* end of the message has been reached */ |
| list_del(&cb->list); |
| rets = 0; |
| goto free; |
| } |
| /* else means that not full buffer will be read and do not |
| * remove message from deletion list |
| */ |
| |
| dev_dbg(&dev->pdev->dev, "amthif cb->response_buffer size - %d\n", |
| cb->response_buffer.size); |
| dev_dbg(&dev->pdev->dev, "amthif cb->buf_idx - %lu\n", cb->buf_idx); |
| |
| /* length is being truncated to PAGE_SIZE, however, |
| * the buf_idx may point beyond */ |
| length = min_t(size_t, length, (cb->buf_idx - *offset)); |
| |
| if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) |
| rets = -EFAULT; |
| else { |
| rets = length; |
| if ((*offset + length) < cb->buf_idx) { |
| *offset += length; |
| goto out; |
| } |
| } |
| free: |
| dev_dbg(&dev->pdev->dev, "free amthif cb memory.\n"); |
| *offset = 0; |
| mei_io_cb_free(cb); |
| out: |
| return rets; |
| } |
| |
| /** |
| * mei_amthif_send_cmd - send amthif command to the ME |
| * |
| * @dev: the device structure |
| * @cb: mei call back struct |
| * |
| * returns 0 on success, <0 on failure. |
| * |
| */ |
| static int mei_amthif_send_cmd(struct mei_device *dev, struct mei_cl_cb *cb) |
| { |
| struct mei_msg_hdr mei_hdr; |
| int ret; |
| |
| if (!dev || !cb) |
| return -ENODEV; |
| |
| dev_dbg(&dev->pdev->dev, "write data to amthif client.\n"); |
| |
| dev->iamthif_state = MEI_IAMTHIF_WRITING; |
| dev->iamthif_current_cb = cb; |
| dev->iamthif_file_object = cb->file_object; |
| dev->iamthif_canceled = false; |
| dev->iamthif_ioctl = true; |
| dev->iamthif_msg_buf_size = cb->request_buffer.size; |
| memcpy(dev->iamthif_msg_buf, cb->request_buffer.data, |
| cb->request_buffer.size); |
| |
| ret = mei_cl_flow_ctrl_creds(&dev->iamthif_cl); |
| if (ret < 0) |
| return ret; |
| |
| if (ret && mei_hbuf_acquire(dev)) { |
| ret = 0; |
| if (cb->request_buffer.size > mei_hbuf_max_len(dev)) { |
| mei_hdr.length = mei_hbuf_max_len(dev); |
| mei_hdr.msg_complete = 0; |
| } else { |
| mei_hdr.length = cb->request_buffer.size; |
| mei_hdr.msg_complete = 1; |
| } |
| |
| mei_hdr.host_addr = dev->iamthif_cl.host_client_id; |
| mei_hdr.me_addr = dev->iamthif_cl.me_client_id; |
| mei_hdr.reserved = 0; |
| mei_hdr.internal = 0; |
| dev->iamthif_msg_buf_index += mei_hdr.length; |
| ret = mei_write_message(dev, &mei_hdr, dev->iamthif_msg_buf); |
| if (ret) |
| return ret; |
| |
| if (mei_hdr.msg_complete) { |
| if (mei_cl_flow_ctrl_reduce(&dev->iamthif_cl)) |
| return -EIO; |
| dev->iamthif_flow_control_pending = true; |
| dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL; |
| dev_dbg(&dev->pdev->dev, "add amthif cb to write waiting list\n"); |
| dev->iamthif_current_cb = cb; |
| dev->iamthif_file_object = cb->file_object; |
| list_add_tail(&cb->list, &dev->write_waiting_list.list); |
| } else { |
| dev_dbg(&dev->pdev->dev, "message does not complete, so add amthif cb to write list.\n"); |
| list_add_tail(&cb->list, &dev->write_list.list); |
| } |
| } else { |
| list_add_tail(&cb->list, &dev->write_list.list); |
| } |
| return 0; |
| } |
| |
| /** |
| * mei_amthif_write - write amthif data to amthif client |
| * |
| * @dev: the device structure |
| * @cb: mei call back struct |
| * |
| * returns 0 on success, <0 on failure. |
| * |
| */ |
| int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *cb) |
| { |
| int ret; |
| |
| if (!dev || !cb) |
| return -ENODEV; |
| |
| ret = mei_io_cb_alloc_resp_buf(cb, dev->iamthif_mtu); |
| if (ret) |
| return ret; |
| |
| cb->fop_type = MEI_FOP_WRITE; |
| |
| if (!list_empty(&dev->amthif_cmd_list.list) || |
| dev->iamthif_state != MEI_IAMTHIF_IDLE) { |
| dev_dbg(&dev->pdev->dev, |
| "amthif state = %d\n", dev->iamthif_state); |
| dev_dbg(&dev->pdev->dev, "AMTHIF: add cb to the wait list\n"); |
| list_add_tail(&cb->list, &dev->amthif_cmd_list.list); |
| return 0; |
| } |
| return mei_amthif_send_cmd(dev, cb); |
| } |
| /** |
| * mei_amthif_run_next_cmd |
| * |
| * @dev: the device structure |
| * |
| * returns 0 on success, <0 on failure. |
| */ |
| void mei_amthif_run_next_cmd(struct mei_device *dev) |
| { |
| struct mei_cl_cb *pos = NULL; |
| struct mei_cl_cb *next = NULL; |
| int status; |
| |
| if (!dev) |
| return; |
| |
| dev->iamthif_msg_buf_size = 0; |
| dev->iamthif_msg_buf_index = 0; |
| dev->iamthif_canceled = false; |
| dev->iamthif_ioctl = true; |
| dev->iamthif_state = MEI_IAMTHIF_IDLE; |
| dev->iamthif_timer = 0; |
| dev->iamthif_file_object = NULL; |
| |
| dev_dbg(&dev->pdev->dev, "complete amthif cmd_list cb.\n"); |
| |
| list_for_each_entry_safe(pos, next, &dev->amthif_cmd_list.list, list) { |
| list_del(&pos->list); |
| |
| if (pos->cl && pos->cl == &dev->iamthif_cl) { |
| status = mei_amthif_send_cmd(dev, pos); |
| if (status) { |
| dev_dbg(&dev->pdev->dev, |
| "amthif write failed status = %d\n", |
| status); |
| return; |
| } |
| break; |
| } |
| } |
| } |
| |
| |
| unsigned int mei_amthif_poll(struct mei_device *dev, |
| struct file *file, poll_table *wait) |
| { |
| unsigned int mask = 0; |
| |
| poll_wait(file, &dev->iamthif_cl.wait, wait); |
| |
| mutex_lock(&dev->device_lock); |
| if (!mei_cl_is_connected(&dev->iamthif_cl)) { |
| |
| mask = POLLERR; |
| |
| } else if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE && |
| dev->iamthif_file_object == file) { |
| |
| mask |= (POLLIN | POLLRDNORM); |
| dev_dbg(&dev->pdev->dev, "run next amthif cb\n"); |
| mei_amthif_run_next_cmd(dev); |
| } |
| mutex_unlock(&dev->device_lock); |
| |
| return mask; |
| } |
| |
| |
| |
| /** |
| * mei_amthif_irq_write_completed - processes completed iamthif operation. |
| * |
| * @dev: the device structure. |
| * @slots: free slots. |
| * @cb_pos: callback block. |
| * @cl: private data of the file object. |
| * @cmpl_list: complete list. |
| * |
| * returns 0, OK; otherwise, error. |
| */ |
| int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb, |
| s32 *slots, struct mei_cl_cb *cmpl_list) |
| { |
| struct mei_device *dev = cl->dev; |
| struct mei_msg_hdr mei_hdr; |
| size_t len = dev->iamthif_msg_buf_size - dev->iamthif_msg_buf_index; |
| u32 msg_slots = mei_data2slots(len); |
| int rets; |
| |
| rets = mei_cl_flow_ctrl_creds(cl); |
| if (rets < 0) |
| return rets; |
| |
| if (rets == 0) { |
| cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); |
| return 0; |
| } |
| |
| mei_hdr.host_addr = cl->host_client_id; |
| mei_hdr.me_addr = cl->me_client_id; |
| mei_hdr.reserved = 0; |
| mei_hdr.internal = 0; |
| |
| if (*slots >= msg_slots) { |
| mei_hdr.length = len; |
| mei_hdr.msg_complete = 1; |
| /* Split the message only if we can write the whole host buffer */ |
| } else if (*slots == dev->hbuf_depth) { |
| msg_slots = *slots; |
| len = (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr); |
| mei_hdr.length = len; |
| mei_hdr.msg_complete = 0; |
| } else { |
| /* wait for next time the host buffer is empty */ |
| return 0; |
| } |
| |
| dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(&mei_hdr)); |
| |
| *slots -= msg_slots; |
| rets = mei_write_message(dev, &mei_hdr, |
| dev->iamthif_msg_buf + dev->iamthif_msg_buf_index); |
| if (rets) { |
| dev->iamthif_state = MEI_IAMTHIF_IDLE; |
| cl->status = rets; |
| list_del(&cb->list); |
| return rets; |
| } |
| |
| if (mei_cl_flow_ctrl_reduce(cl)) |
| return -EIO; |
| |
| dev->iamthif_msg_buf_index += mei_hdr.length; |
| cl->status = 0; |
| |
| if (mei_hdr.msg_complete) { |
| dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL; |
| dev->iamthif_flow_control_pending = true; |
| |
| /* save iamthif cb sent to amthif client */ |
| cb->buf_idx = dev->iamthif_msg_buf_index; |
| dev->iamthif_current_cb = cb; |
| |
| list_move_tail(&cb->list, &dev->write_waiting_list.list); |
| } |
| |
| |
| return 0; |
| } |
| |
| /** |
| * mei_amthif_irq_read_message - read routine after ISR to |
| * handle the read amthif message |
| * |
| * @dev: the device structure |
| * @mei_hdr: header of amthif message |
| * @complete_list: An instance of our list structure |
| * |
| * returns 0 on success, <0 on failure. |
| */ |
| int mei_amthif_irq_read_msg(struct mei_device *dev, |
| struct mei_msg_hdr *mei_hdr, |
| struct mei_cl_cb *complete_list) |
| { |
| struct mei_cl_cb *cb; |
| unsigned char *buffer; |
| |
| BUG_ON(mei_hdr->me_addr != dev->iamthif_cl.me_client_id); |
| BUG_ON(dev->iamthif_state != MEI_IAMTHIF_READING); |
| |
| buffer = dev->iamthif_msg_buf + dev->iamthif_msg_buf_index; |
| BUG_ON(dev->iamthif_mtu < dev->iamthif_msg_buf_index + mei_hdr->length); |
| |
| mei_read_slots(dev, buffer, mei_hdr->length); |
| |
| dev->iamthif_msg_buf_index += mei_hdr->length; |
| |
| if (!mei_hdr->msg_complete) |
| return 0; |
| |
| dev_dbg(&dev->pdev->dev, "amthif_message_buffer_index =%d\n", |
| mei_hdr->length); |
| |
| dev_dbg(&dev->pdev->dev, "completed amthif read.\n "); |
| if (!dev->iamthif_current_cb) |
| return -ENODEV; |
| |
| cb = dev->iamthif_current_cb; |
| dev->iamthif_current_cb = NULL; |
| |
| if (!cb->cl) |
| return -ENODEV; |
| |
| dev->iamthif_stall_timer = 0; |
| cb->buf_idx = dev->iamthif_msg_buf_index; |
| cb->read_time = jiffies; |
| if (dev->iamthif_ioctl && cb->cl == &dev->iamthif_cl) { |
| /* found the iamthif cb */ |
| dev_dbg(&dev->pdev->dev, "complete the amthif read cb.\n "); |
| dev_dbg(&dev->pdev->dev, "add the amthif read cb to complete.\n "); |
| list_add_tail(&cb->list, &complete_list->list); |
| } |
| return 0; |
| } |
| |
| /** |
| * mei_amthif_irq_read - prepares to read amthif data. |
| * |
| * @dev: the device structure. |
| * @slots: free slots. |
| * |
| * returns 0, OK; otherwise, error. |
| */ |
| int mei_amthif_irq_read(struct mei_device *dev, s32 *slots) |
| { |
| u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control)); |
| |
| if (*slots < msg_slots) |
| return -EMSGSIZE; |
| |
| *slots -= msg_slots; |
| |
| if (mei_hbm_cl_flow_control_req(dev, &dev->iamthif_cl)) { |
| dev_dbg(&dev->pdev->dev, "iamthif flow control failed\n"); |
| return -EIO; |
| } |
| |
| dev_dbg(&dev->pdev->dev, "iamthif flow control success\n"); |
| dev->iamthif_state = MEI_IAMTHIF_READING; |
| dev->iamthif_flow_control_pending = false; |
| dev->iamthif_msg_buf_index = 0; |
| dev->iamthif_msg_buf_size = 0; |
| dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER; |
| dev->hbuf_is_ready = mei_hbuf_is_ready(dev); |
| return 0; |
| } |
| |
| /** |
| * mei_amthif_complete - complete amthif callback. |
| * |
| * @dev: the device structure. |
| * @cb_pos: callback block. |
| */ |
| void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb) |
| { |
| if (dev->iamthif_canceled != 1) { |
| dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE; |
| dev->iamthif_stall_timer = 0; |
| memcpy(cb->response_buffer.data, |
| dev->iamthif_msg_buf, |
| dev->iamthif_msg_buf_index); |
| list_add_tail(&cb->list, &dev->amthif_rd_complete_list.list); |
| dev_dbg(&dev->pdev->dev, "amthif read completed\n"); |
| dev->iamthif_timer = jiffies; |
| dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n", |
| dev->iamthif_timer); |
| } else { |
| mei_amthif_run_next_cmd(dev); |
| } |
| |
| dev_dbg(&dev->pdev->dev, "completing amthif call back.\n"); |
| wake_up_interruptible(&dev->iamthif_cl.wait); |
| } |
| |
| /** |
| * mei_clear_list - removes all callbacks associated with file |
| * from mei_cb_list |
| * |
| * @dev: device structure. |
| * @file: file structure |
| * @mei_cb_list: callbacks list |
| * |
| * mei_clear_list is called to clear resources associated with file |
| * when application calls close function or Ctrl-C was pressed |
| * |
| * returns true if callback removed from the list, false otherwise |
| */ |
| static bool mei_clear_list(struct mei_device *dev, |
| const struct file *file, struct list_head *mei_cb_list) |
| { |
| struct mei_cl_cb *cb_pos = NULL; |
| struct mei_cl_cb *cb_next = NULL; |
| bool removed = false; |
| |
| /* list all list member */ |
| list_for_each_entry_safe(cb_pos, cb_next, mei_cb_list, list) { |
| /* check if list member associated with a file */ |
| if (file == cb_pos->file_object) { |
| /* remove member from the list */ |
| list_del(&cb_pos->list); |
| /* check if cb equal to current iamthif cb */ |
| if (dev->iamthif_current_cb == cb_pos) { |
| dev->iamthif_current_cb = NULL; |
| /* send flow control to iamthif client */ |
| mei_hbm_cl_flow_control_req(dev, |
| &dev->iamthif_cl); |
| } |
| /* free all allocated buffers */ |
| mei_io_cb_free(cb_pos); |
| cb_pos = NULL; |
| removed = true; |
| } |
| } |
| return removed; |
| } |
| |
| /** |
| * mei_clear_lists - removes all callbacks associated with file |
| * |
| * @dev: device structure |
| * @file: file structure |
| * |
| * mei_clear_lists is called to clear resources associated with file |
| * when application calls close function or Ctrl-C was pressed |
| * |
| * returns true if callback removed from the list, false otherwise |
| */ |
| static bool mei_clear_lists(struct mei_device *dev, struct file *file) |
| { |
| bool removed = false; |
| |
| /* remove callbacks associated with a file */ |
| mei_clear_list(dev, file, &dev->amthif_cmd_list.list); |
| if (mei_clear_list(dev, file, &dev->amthif_rd_complete_list.list)) |
| removed = true; |
| |
| mei_clear_list(dev, file, &dev->ctrl_rd_list.list); |
| |
| if (mei_clear_list(dev, file, &dev->ctrl_wr_list.list)) |
| removed = true; |
| |
| if (mei_clear_list(dev, file, &dev->write_waiting_list.list)) |
| removed = true; |
| |
| if (mei_clear_list(dev, file, &dev->write_list.list)) |
| removed = true; |
| |
| /* check if iamthif_current_cb not NULL */ |
| if (dev->iamthif_current_cb && !removed) { |
| /* check file and iamthif current cb association */ |
| if (dev->iamthif_current_cb->file_object == file) { |
| /* remove cb */ |
| mei_io_cb_free(dev->iamthif_current_cb); |
| dev->iamthif_current_cb = NULL; |
| removed = true; |
| } |
| } |
| return removed; |
| } |
| |
| /** |
| * mei_amthif_release - the release function |
| * |
| * @dev: device structure |
| * @file: pointer to file structure |
| * |
| * returns 0 on success, <0 on error |
| */ |
| int mei_amthif_release(struct mei_device *dev, struct file *file) |
| { |
| if (dev->iamthif_open_count > 0) |
| dev->iamthif_open_count--; |
| |
| if (dev->iamthif_file_object == file && |
| dev->iamthif_state != MEI_IAMTHIF_IDLE) { |
| |
| dev_dbg(&dev->pdev->dev, "amthif canceled iamthif state %d\n", |
| dev->iamthif_state); |
| dev->iamthif_canceled = true; |
| if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) { |
| dev_dbg(&dev->pdev->dev, "run next amthif iamthif cb\n"); |
| mei_amthif_run_next_cmd(dev); |
| } |
| } |
| |
| if (mei_clear_lists(dev, file)) |
| dev->iamthif_state = MEI_IAMTHIF_IDLE; |
| |
| return 0; |
| } |