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Message-Id: <1351797438-26345-1-git-send-email-tomas.winkler@intel.com>
Date: Thu, 1 Nov 2012 21:17:13 +0200
From: Tomas Winkler <tomas.winkler@...el.com>
To: gregkh@...uxfoundation.org
Cc: arnd@...db.de, alan@...ux.intel.com, linux-kernel@...r.kernel.org,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 1/6] mei: mei_write: revamp function flow
Use goto statement for error handling instead of deeper if constructs
and rename label 'unlock_dev' to more appropriate 'err'
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
drivers/misc/mei/main.c | 88 +++++++++++++++++++++++-----------------------
1 files changed, 44 insertions(+), 44 deletions(-)
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index ed4943f..7a03d77 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -543,24 +543,24 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
if (dev->dev_state != MEI_DEV_ENABLED) {
rets = -ENODEV;
- goto unlock_dev;
+ goto err;
}
i = mei_me_cl_by_id(dev, cl->me_client_id);
if (i < 0) {
rets = -ENODEV;
- goto unlock_dev;
+ goto err;
}
if (length > dev->me_clients[i].props.max_msg_length || length <= 0) {
rets = -EMSGSIZE;
- goto unlock_dev;
+ goto err;
}
if (cl->state != MEI_FILE_CONNECTED) {
rets = -ENODEV;
dev_err(&dev->pdev->dev, "host client = %d, is not connected to ME client = %d",
cl->host_client_id, cl->me_client_id);
- goto unlock_dev;
+ goto err;
}
if (cl == &dev->iamthif_cl) {
write_cb = find_amthi_read_list_entry(dev, file);
@@ -599,17 +599,17 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
if (!write_cb) {
dev_err(&dev->pdev->dev, "write cb allocation failed\n");
rets = -ENOMEM;
- goto unlock_dev;
+ goto err;
}
rets = mei_io_cb_alloc_req_buf(write_cb, length);
if (rets)
- goto unlock_dev;
+ goto err;
dev_dbg(&dev->pdev->dev, "cb request size = %zd\n", length);
rets = copy_from_user(write_cb->request_buffer.data, ubuf, length);
if (rets)
- goto unlock_dev;
+ goto err;
cl->sm_state = 0;
if (length == 4 &&
@@ -624,7 +624,7 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
if (cl == &dev->iamthif_cl) {
rets = mei_io_cb_alloc_resp_buf(write_cb, dev->iamthif_mtu);
if (rets)
- goto unlock_dev;
+ goto err;
write_cb->major_file_operations = MEI_IOCTL;
@@ -641,7 +641,7 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
if (rets) {
dev_err(&dev->pdev->dev, "amthi write failed with status = %d\n",
rets);
- goto unlock_dev;
+ goto err;
}
}
mutex_unlock(&dev->device_lock);
@@ -654,51 +654,51 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
cl->host_client_id, cl->me_client_id);
rets = mei_flow_ctrl_creds(dev, cl);
if (rets < 0)
- goto unlock_dev;
+ goto err;
- if (rets && dev->mei_host_buffer_is_empty) {
- rets = 0;
- dev->mei_host_buffer_is_empty = false;
- if (length > mei_hbuf_max_data(dev)) {
- mei_hdr.length = mei_hbuf_max_data(dev);
- mei_hdr.msg_complete = 0;
- } else {
- mei_hdr.length = length;
- mei_hdr.msg_complete = 1;
- }
- mei_hdr.host_addr = cl->host_client_id;
- mei_hdr.me_addr = cl->me_client_id;
- mei_hdr.reserved = 0;
- dev_dbg(&dev->pdev->dev, "call mei_write_message header=%08x.\n",
- *((u32 *) &mei_hdr));
- if (mei_write_message(dev, &mei_hdr,
- (unsigned char *) (write_cb->request_buffer.data),
- mei_hdr.length)) {
- rets = -ENODEV;
- goto unlock_dev;
- }
+ if (rets == 0 || dev->mei_host_buffer_is_empty == false) {
+ write_cb->buf_idx = 0;
+ mei_hdr.msg_complete = 0;
cl->writing_state = MEI_WRITING;
- write_cb->buf_idx = mei_hdr.length;
- if (mei_hdr.msg_complete) {
- if (mei_flow_ctrl_reduce(dev, cl)) {
- rets = -ENODEV;
- goto unlock_dev;
- }
- list_add_tail(&write_cb->list, &dev->write_waiting_list.list);
- } else {
- list_add_tail(&write_cb->list, &dev->write_list.list);
- }
+ goto out;
+ }
+ dev->mei_host_buffer_is_empty = false;
+ if (length > mei_hbuf_max_data(dev)) {
+ mei_hdr.length = mei_hbuf_max_data(dev);
+ mei_hdr.msg_complete = 0;
} else {
+ mei_hdr.length = length;
+ mei_hdr.msg_complete = 1;
+ }
+ mei_hdr.host_addr = cl->host_client_id;
+ mei_hdr.me_addr = cl->me_client_id;
+ mei_hdr.reserved = 0;
+ dev_dbg(&dev->pdev->dev, "call mei_write_message header=%08x.\n",
+ *((u32 *) &mei_hdr));
+ if (mei_write_message(dev, &mei_hdr,
+ write_cb->request_buffer.data, mei_hdr.length)) {
+ rets = -ENODEV;
+ goto err;
+ }
+ cl->writing_state = MEI_WRITING;
+ write_cb->buf_idx = mei_hdr.length;
- write_cb->buf_idx = 0;
- cl->writing_state = MEI_WRITING;
+out:
+ if (mei_hdr.msg_complete) {
+ if (mei_flow_ctrl_reduce(dev, cl)) {
+ rets = -ENODEV;
+ goto err;
+ }
+ list_add_tail(&write_cb->list, &dev->write_waiting_list.list);
+ } else {
list_add_tail(&write_cb->list, &dev->write_list.list);
}
+
mutex_unlock(&dev->device_lock);
return length;
-unlock_dev:
+err:
mutex_unlock(&dev->device_lock);
mei_io_cb_free(write_cb);
return rets;
--
1.7.4.4
--
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