[staging-next] staging/mei: propagate error codes up in the write flow
Tomas Winkler
tomas.winkler at intel.com
Wed Mar 14 12:39:42 UTC 2012
Change mei_write_message's return type from bool to int
to enable propagation of the error code up to caller functions.
The function now returns -EIO when low level write fails and 0
on success.
A similar change is done in intermediate caller functions:
mei_send_flow_control, mei_connect, and mei_disconnect
This makes code more alike to typical Linux kernel error
handling.
Signed-off-by: Tomas Winkler <tomas.winkler at intel.com>
---
drivers/staging/mei/init.c | 16 ++++-----
drivers/staging/mei/interface.c | 39 ++++++++--------------
drivers/staging/mei/interrupt.c | 68 ++++++++++++++++++--------------------
drivers/staging/mei/iorw.c | 10 ++---
drivers/staging/mei/main.c | 2 +-
drivers/staging/mei/wd.c | 6 +--
6 files changed, 61 insertions(+), 80 deletions(-)
diff --git a/drivers/staging/mei/init.c b/drivers/staging/mei/init.c
index e24b6ad..eab711f 100644
--- a/drivers/staging/mei/init.c
+++ b/drivers/staging/mei/init.c
@@ -366,7 +366,7 @@ void mei_host_start_message(struct mei_device *dev)
host_start_req->host_version.major_version = HBM_MAJOR_VERSION;
host_start_req->host_version.minor_version = HBM_MINOR_VERSION;
dev->recvd_msg = false;
- if (!mei_write_message(dev, mei_hdr, (unsigned char *)host_start_req,
+ if (mei_write_message(dev, mei_hdr, (unsigned char *)host_start_req,
mei_hdr->length)) {
dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n");
dev->mei_state = MEI_RESETING;
@@ -399,7 +399,7 @@ void mei_host_enum_clients_message(struct mei_device *dev)
host_enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1];
memset(host_enum_req, 0, sizeof(struct hbm_host_enum_request));
host_enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
- if (!mei_write_message(dev, mei_hdr, (unsigned char *)host_enum_req,
+ if (mei_write_message(dev, mei_hdr, (unsigned char *)host_enum_req,
mei_hdr->length)) {
dev->mei_state = MEI_RESETING;
dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
@@ -407,7 +407,7 @@ void mei_host_enum_clients_message(struct mei_device *dev)
}
dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE;
dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
- return ;
+ return;
}
@@ -485,7 +485,7 @@ int mei_host_client_properties(struct mei_device *dev)
host_cli_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
host_cli_req->address = b;
- if (!mei_write_message(dev, mei_header,
+ if (mei_write_message(dev, mei_header,
(unsigned char *)host_cli_req,
mei_header->length)) {
dev->mei_state = MEI_RESETING;
@@ -608,7 +608,7 @@ void mei_host_init_iamthif(struct mei_device *dev)
dev->iamthif_msg_buf = msg_buf;
- if (!mei_connect(dev, &dev->iamthif_cl)) {
+ if (mei_connect(dev, &dev->iamthif_cl)) {
dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n");
dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
dev->iamthif_cl.host_client_id = 0;
@@ -670,14 +670,12 @@ int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl)
if (dev->mei_host_buffer_is_empty) {
dev->mei_host_buffer_is_empty = false;
if (mei_disconnect(dev, cl)) {
- mdelay(10); /* Wait for hardware disconnection ready */
- list_add_tail(&cb->cb_list,
- &dev->ctrl_rd_list.mei_cb.cb_list);
- } else {
rets = -ENODEV;
dev_dbg(&dev->pdev->dev, "failed to call mei_disconnect.\n");
goto free;
}
+ mdelay(10); /* Wait for hardware disconnection ready */
+ list_add_tail(&cb->cb_list, &dev->ctrl_rd_list.mei_cb.cb_list);
} else {
dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
list_add_tail(&cb->cb_list,
diff --git a/drivers/staging/mei/interface.c b/drivers/staging/mei/interface.c
index 8a80e80..9a2cfaf 100644
--- a/drivers/staging/mei/interface.c
+++ b/drivers/staging/mei/interface.c
@@ -125,7 +125,7 @@ int mei_count_empty_write_slots(struct mei_device *dev)
* @write_buffer: message buffer will be written
* @write_length: message size will be written
*
- * returns 1 if success, 0 - otherwise.
+ * This function returns -EIO if write has failed
*/
int mei_write_message(struct mei_device *dev,
struct mei_msg_hdr *header,
@@ -157,7 +157,7 @@ int mei_write_message(struct mei_device *dev,
dw_to_write = ((write_length + 3) / 4);
if (dw_to_write > empty_slots)
- return 0;
+ return -EIO;
mei_reg_write(dev, H_CB_WW, *((u32 *) header));
@@ -177,9 +177,9 @@ int mei_write_message(struct mei_device *dev,
mei_hcsr_set(dev);
dev->me_hw_state = mei_mecsr_read(dev);
if ((dev->me_hw_state & ME_RDY_HRA) != ME_RDY_HRA)
- return 0;
+ return -EIO;
- return 1;
+ return 0;
}
/**
@@ -308,7 +308,7 @@ int mei_flow_ctrl_reduce(struct mei_device *dev, struct mei_cl *cl)
* @dev: the device structure
* @cl: private data of the file object
*
- * returns 1 if success, 0 - otherwise.
+ * This function returns -EIO on write failure
*/
int mei_send_flow_control(struct mei_device *dev, struct mei_cl *cl)
{
@@ -330,14 +330,11 @@ int mei_send_flow_control(struct mei_device *dev, struct mei_cl *cl)
memset(mei_flow_control->reserved, 0,
sizeof(mei_flow_control->reserved));
dev_dbg(&dev->pdev->dev, "sending flow control host client = %d, ME client = %d\n",
- cl->host_client_id, cl->me_client_id);
- if (!mei_write_message(dev, mei_hdr,
- (unsigned char *) mei_flow_control,
- sizeof(struct hbm_flow_control)))
- return 0;
-
- return 1;
+ cl->host_client_id, cl->me_client_id);
+ return mei_write_message(dev, mei_hdr,
+ (unsigned char *) mei_flow_control,
+ sizeof(struct hbm_flow_control));
}
/**
@@ -371,7 +368,7 @@ int mei_other_client_is_connecting(struct mei_device *dev,
* @dev: the device structure
* @cl: private data of the file object
*
- * returns 1 if success, 0 - otherwise.
+ * This function returns -EIO on write failure
*/
int mei_disconnect(struct mei_device *dev, struct mei_cl *cl)
{
@@ -393,12 +390,9 @@ int mei_disconnect(struct mei_device *dev, struct mei_cl *cl)
mei_cli_disconnect->hbm_cmd = CLIENT_DISCONNECT_REQ_CMD;
mei_cli_disconnect->reserved[0] = 0;
- if (!mei_write_message(dev, mei_hdr,
+ return mei_write_message(dev, mei_hdr,
(unsigned char *) mei_cli_disconnect,
- sizeof(struct hbm_client_disconnect_request)))
- return 0;
-
- return 1;
+ sizeof(struct hbm_client_disconnect_request));
}
/**
@@ -407,7 +401,7 @@ int mei_disconnect(struct mei_device *dev, struct mei_cl *cl)
* @dev: the device structure
* @cl: private data of the file object
*
- * returns 1 if success, 0 - otherwise.
+ * This function returns -EIO on write failure
*/
int mei_connect(struct mei_device *dev, struct mei_cl *cl)
{
@@ -428,10 +422,7 @@ int mei_connect(struct mei_device *dev, struct mei_cl *cl)
mei_cli_connect->hbm_cmd = CLIENT_CONNECT_REQ_CMD;
mei_cli_connect->reserved = 0;
- if (!mei_write_message(dev, mei_hdr,
+ return mei_write_message(dev, mei_hdr,
(unsigned char *) mei_cli_connect,
- sizeof(struct hbm_client_connect_request)))
- return 0;
-
- return 1;
+ sizeof(struct hbm_client_connect_request));
}
diff --git a/drivers/staging/mei/interrupt.c b/drivers/staging/mei/interrupt.c
index a34e2f3..2007d24 100644
--- a/drivers/staging/mei/interrupt.c
+++ b/drivers/staging/mei/interrupt.c
@@ -263,26 +263,25 @@ quit:
static int _mei_irq_thread_iamthif_read(struct mei_device *dev, s32 *slots)
{
- if (((*slots) * sizeof(u32)) >= (sizeof(struct mei_msg_hdr)
+ if (((*slots) * sizeof(u32)) < (sizeof(struct mei_msg_hdr)
+ sizeof(struct hbm_flow_control))) {
- *slots -= (sizeof(struct mei_msg_hdr) +
- sizeof(struct hbm_flow_control) + 3) / 4;
- if (!mei_send_flow_control(dev, &dev->iamthif_cl)) {
- dev_dbg(&dev->pdev->dev, "iamthif flow control failed\n");
- } else {
- 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 = IAMTHIF_STALL_TIMER;
- dev->mei_host_buffer_is_empty =
- mei_host_buffer_is_empty(dev);
- }
- return 0;
- } else {
return -EMSGSIZE;
}
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ sizeof(struct hbm_flow_control) + 3) / 4;
+ if (mei_send_flow_control(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 = IAMTHIF_STALL_TIMER;
+ dev->mei_host_buffer_is_empty = mei_host_buffer_is_empty(dev);
+ return 0;
}
/**
@@ -306,7 +305,7 @@ static int _mei_irq_thread_close(struct mei_device *dev, s32 *slots,
*slots -= (sizeof(struct mei_msg_hdr) +
sizeof(struct hbm_client_disconnect_request) + 3) / 4;
- if (!mei_disconnect(dev, cl)) {
+ if (mei_disconnect(dev, cl)) {
cl->status = 0;
cb_pos->information = 0;
list_move_tail(&cb_pos->cb_list,
@@ -838,24 +837,21 @@ static int _mei_irq_thread_read(struct mei_device *dev, s32 *slots,
{
if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
sizeof(struct hbm_flow_control))) {
- *slots -= (sizeof(struct mei_msg_hdr) +
- sizeof(struct hbm_flow_control) + 3) / 4;
- if (!mei_send_flow_control(dev, cl)) {
- cl->status = -ENODEV;
- cb_pos->information = 0;
- list_move_tail(&cb_pos->cb_list,
- &cmpl_list->mei_cb.cb_list);
- return -ENODEV;
- } else {
- list_move_tail(&cb_pos->cb_list,
- &dev->read_list.mei_cb.cb_list);
- }
- } else {
/* return the cancel routine */
list_del(&cb_pos->cb_list);
return -EBADMSG;
}
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ sizeof(struct hbm_flow_control) + 3) / 4;
+ if (mei_send_flow_control(dev, cl)) {
+ cl->status = -ENODEV;
+ cb_pos->information = 0;
+ list_move_tail(&cb_pos->cb_list, &cmpl_list->mei_cb.cb_list);
+ return -ENODEV;
+ }
+ list_move_tail(&cb_pos->cb_list, &dev->read_list.mei_cb.cb_list);
+
return 0;
}
@@ -881,7 +877,7 @@ static int _mei_irq_thread_ioctl(struct mei_device *dev, s32 *slots,
cl->state = MEI_FILE_CONNECTING;
*slots -= (sizeof(struct mei_msg_hdr) +
sizeof(struct hbm_client_connect_request) + 3) / 4;
- if (!mei_connect(dev, cl)) {
+ if (mei_connect(dev, cl)) {
cl->status = -ENODEV;
cb_pos->information = 0;
list_del(&cb_pos->cb_list);
@@ -938,7 +934,7 @@ static int _mei_irq_thread_cmpl(struct mei_device *dev, s32 *slots,
mei_hdr->length);
*slots -= (sizeof(struct mei_msg_hdr) +
mei_hdr->length + 3) / 4;
- if (!mei_write_message(dev, mei_hdr,
+ if (mei_write_message(dev, mei_hdr,
(unsigned char *)
(cb_pos->request_buffer.data +
cb_pos->information),
@@ -967,7 +963,7 @@ static int _mei_irq_thread_cmpl(struct mei_device *dev, s32 *slots,
(*slots) -= (sizeof(struct mei_msg_hdr) +
mei_hdr->length + 3) / 4;
- if (!mei_write_message(dev, mei_hdr,
+ if (mei_write_message(dev, mei_hdr,
(unsigned char *)
(cb_pos->request_buffer.data +
cb_pos->information),
@@ -1028,7 +1024,7 @@ static int _mei_irq_thread_cmpl_iamthif(struct mei_device *dev, s32 *slots,
*slots -= (sizeof(struct mei_msg_hdr) +
mei_hdr->length + 3) / 4;
- if (!mei_write_message(dev, mei_hdr,
+ if (mei_write_message(dev, mei_hdr,
(dev->iamthif_msg_buf +
dev->iamthif_msg_buf_index),
mei_hdr->length)) {
@@ -1063,7 +1059,7 @@ static int _mei_irq_thread_cmpl_iamthif(struct mei_device *dev, s32 *slots,
*slots -= (sizeof(struct mei_msg_hdr) +
mei_hdr->length + 3) / 4;
- if (!mei_write_message(dev, mei_hdr,
+ if (mei_write_message(dev, mei_hdr,
(dev->iamthif_msg_buf +
dev->iamthif_msg_buf_index),
mei_hdr->length)) {
diff --git a/drivers/staging/mei/iorw.c b/drivers/staging/mei/iorw.c
index a6b9694..121b377 100644
--- a/drivers/staging/mei/iorw.c
+++ b/drivers/staging/mei/iorw.c
@@ -162,7 +162,7 @@ int mei_ioctl_connect_client(struct file *file,
&& !mei_other_client_is_connecting(dev, cl)) {
dev_dbg(&dev->pdev->dev, "Sending Connect Message\n");
dev->mei_host_buffer_is_empty = false;
- if (!mei_connect(dev, cl)) {
+ if (mei_connect(dev, cl)) {
dev_dbg(&dev->pdev->dev, "Sending connect message - failed\n");
rets = -ENODEV;
goto end;
@@ -434,13 +434,11 @@ int mei_start_read(struct mei_device *dev, struct mei_cl *cl)
cl->read_cb = cb;
if (dev->mei_host_buffer_is_empty) {
dev->mei_host_buffer_is_empty = false;
- if (!mei_send_flow_control(dev, cl)) {
+ if (mei_send_flow_control(dev, cl)) {
rets = -ENODEV;
goto unlock;
- } else {
- list_add_tail(&cb->cb_list,
- &dev->read_list.mei_cb.cb_list);
}
+ list_add_tail(&cb->cb_list, &dev->read_list.mei_cb.cb_list);
} else {
list_add_tail(&cb->cb_list, &dev->ctrl_wr_list.mei_cb.cb_list);
}
@@ -500,7 +498,7 @@ int amthi_write(struct mei_device *dev, struct mei_cl_cb *cb)
mei_hdr.me_addr = dev->iamthif_cl.me_client_id;
mei_hdr.reserved = 0;
dev->iamthif_msg_buf_index += mei_hdr.length;
- if (!mei_write_message(dev, &mei_hdr,
+ if (mei_write_message(dev, &mei_hdr,
(unsigned char *)(dev->iamthif_msg_buf),
mei_hdr.length))
return -ENODEV;
diff --git a/drivers/staging/mei/main.c b/drivers/staging/mei/main.c
index 64456ce..55b3908 100644
--- a/drivers/staging/mei/main.c
+++ b/drivers/staging/mei/main.c
@@ -740,7 +740,7 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
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,
+ if (mei_write_message(dev, &mei_hdr,
(unsigned char *) (write_cb->request_buffer.data),
mei_hdr.length)) {
rets = -ENODEV;
diff --git a/drivers/staging/mei/wd.c b/drivers/staging/mei/wd.c
index f397835..a6910da 100644
--- a/drivers/staging/mei/wd.c
+++ b/drivers/staging/mei/wd.c
@@ -74,7 +74,7 @@ bool mei_wd_host_init(struct mei_device *dev)
dev_dbg(&dev->pdev->dev, "check wd_cl\n");
if (MEI_FILE_CONNECTING == dev->wd_cl.state) {
- if (!mei_connect(dev, &dev->wd_cl)) {
+ if (mei_connect(dev, &dev->wd_cl)) {
dev_dbg(&dev->pdev->dev, "Failed to connect to WD client\n");
dev->wd_cl.state = MEI_FILE_DISCONNECTED;
dev->wd_cl.host_client_id = 0;
@@ -119,9 +119,7 @@ int mei_wd_send(struct mei_device *dev)
else
return -EINVAL;
- if (mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length))
- return 0;
- return -EIO;
+ return mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length);
}
/**
--
1.7.4.4
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