| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1366398096-14756-1-git-send-email-tomas.winkler@intel.com>
Date: Fri, 19 Apr 2013 22:01:34 +0300
From: Tomas Winkler <tomas.winkler@...el.com>
To: gregkh@...uxfoundation.org
Cc: arnd@...db.de, linux-kernel@...r.kernel.org,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 1/3] mei: revamp mei_irq_read_client_message function
1. Rename the function and change parameters order,
so that first parameter is mei_device
2. Simplify the function code flow
3. Rename helper functions to more self descriptive names
4. Use helpers common functions where possible
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
drivers/misc/mei/interrupt.c | 124 +++++++++++++++++++++++--------------------
1 file changed, 66 insertions(+), 58 deletions(-)
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 8e4db3d..9bf64c0 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -82,80 +82,90 @@ void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *compl_list)
}
}
EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
+
/**
- * _mei_irq_thread_state_ok - checks if mei header matches file private data
+ * mei_cl_hbm_equal - check if hbm is addressed to the client
*
- * @cl: private data of the file object
+ * @cl: host client
* @mei_hdr: header of mei client message
*
- * returns !=0 if matches, 0 if no match.
+ * returns true if matches, false otherwise
+ */
+static inline int mei_cl_hbm_equal(struct mei_cl *cl,
+ struct mei_msg_hdr *mei_hdr)
+{
+ return cl->host_client_id == mei_hdr->host_addr &&
+ cl->me_client_id == mei_hdr->me_addr;
+}
+/**
+ * mei_cl_is_reading - checks if the client
+ is the one to read this message
+ *
+ * @cl: mei client
+ * @mei_hdr: header of mei message
+ *
+ * returns true on match and false otherwise
*/
-static int _mei_irq_thread_state_ok(struct mei_cl *cl,
- struct mei_msg_hdr *mei_hdr)
+static bool mei_cl_is_reading(struct mei_cl *cl, struct mei_msg_hdr *mei_hdr)
{
- return (cl->host_client_id == mei_hdr->host_addr &&
- cl->me_client_id == mei_hdr->me_addr &&
+ return mei_cl_hbm_equal(cl, mei_hdr) &&
cl->state == MEI_FILE_CONNECTED &&
- MEI_READ_COMPLETE != cl->reading_state);
+ cl->reading_state != MEI_READ_COMPLETE;
}
/**
- * mei_irq_thread_read_client_message - bottom half read routine after ISR to
- * handle the read mei client message data processing.
+ * mei_irq_read_client_message - process client message
*
- * @complete_list: An instance of our list structure
* @dev: the device structure
* @mei_hdr: header of mei client message
+ * @complete_list: An instance of our list structure
*
* returns 0 on success, <0 on failure.
*/
-static int mei_irq_thread_read_client_message(struct mei_cl_cb *complete_list,
- struct mei_device *dev,
- struct mei_msg_hdr *mei_hdr)
+static int mei_cl_irq_read_msg(struct mei_device *dev,
+ struct mei_msg_hdr *mei_hdr,
+ struct mei_cl_cb *complete_list)
{
struct mei_cl *cl;
- struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
+ struct mei_cl_cb *cb, *next;
unsigned char *buffer = NULL;
- dev_dbg(&dev->pdev->dev, "start client msg\n");
- if (list_empty(&dev->read_list.list))
- goto quit;
-
- list_for_each_entry_safe(cb_pos, cb_next, &dev->read_list.list, list) {
- cl = cb_pos->cl;
- if (cl && _mei_irq_thread_state_ok(cl, mei_hdr)) {
- cl->reading_state = MEI_READING;
- buffer = cb_pos->response_buffer.data + cb_pos->buf_idx;
-
- if (cb_pos->response_buffer.size <
- mei_hdr->length + cb_pos->buf_idx) {
- dev_dbg(&dev->pdev->dev, "message overflow.\n");
- list_del(&cb_pos->list);
- return -ENOMEM;
- }
- if (buffer)
- mei_read_slots(dev, buffer, mei_hdr->length);
-
- cb_pos->buf_idx += mei_hdr->length;
- if (mei_hdr->msg_complete) {
- cl->status = 0;
- list_del(&cb_pos->list);
- dev_dbg(&dev->pdev->dev,
- "completed read H cl = %d, ME cl = %d, length = %lu\n",
- cl->host_client_id,
- cl->me_client_id,
- cb_pos->buf_idx);
-
- list_add_tail(&cb_pos->list,
- &complete_list->list);
- }
+ list_for_each_entry_safe(cb, next, &dev->read_list.list, list) {
+ cl = cb->cl;
+ if (!cl || !mei_cl_is_reading(cl, mei_hdr))
+ continue;
- break;
+ cl->reading_state = MEI_READING;
+
+ if (cb->response_buffer.size == 0 ||
+ cb->response_buffer.data == NULL) {
+ dev_err(&dev->pdev->dev, "response buffer is not allocated.\n");
+ list_del(&cb->list);
+ return -ENOMEM;
+ }
+
+ if (cb->response_buffer.size < mei_hdr->length + cb->buf_idx) {
+ dev_warn(&dev->pdev->dev, "message overflow.\n");
+ list_del(&cb->list);
+ return -ENOMEM;
}
+ buffer = cb->response_buffer.data + cb->buf_idx;
+ mei_read_slots(dev, buffer, mei_hdr->length);
+
+ cb->buf_idx += mei_hdr->length;
+ if (mei_hdr->msg_complete) {
+ cl->status = 0;
+ list_del(&cb->list);
+ dev_dbg(&dev->pdev->dev, "completed read H cl = %d, ME cl = %d, length = %lu\n",
+ cl->host_client_id,
+ cl->me_client_id,
+ cb->buf_idx);
+ list_add_tail(&cb->list, &complete_list->list);
+ }
+ break;
}
-quit:
dev_dbg(&dev->pdev->dev, "message read\n");
if (!buffer) {
mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
@@ -386,8 +396,7 @@ int mei_irq_read_handler(struct mei_device *dev,
" client = %d, ME client = %d\n",
cl_pos->host_client_id,
cl_pos->me_client_id);
- if (cl_pos->host_client_id == mei_hdr->host_addr &&
- cl_pos->me_client_id == mei_hdr->me_addr)
+ if (mei_cl_hbm_equal(cl_pos, mei_hdr))
break;
}
@@ -398,7 +407,7 @@ int mei_irq_read_handler(struct mei_device *dev,
}
}
if (((*slots) * sizeof(u32)) < mei_hdr->length) {
- dev_dbg(&dev->pdev->dev,
+ dev_err(&dev->pdev->dev,
"we can't read the message slots =%08x.\n",
*slots);
/* we can't read the message */
@@ -414,20 +423,19 @@ int mei_irq_read_handler(struct mei_device *dev,
} else if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
(MEI_FILE_CONNECTED == dev->iamthif_cl.state) &&
(dev->iamthif_state == MEI_IAMTHIF_READING)) {
- dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_iamthif_message.\n");
+ dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_iamthif_message.\n");
dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
ret = mei_amthif_irq_read_msg(dev, mei_hdr, cmpl_list);
if (ret)
goto end;
} else {
- dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_client_message.\n");
- ret = mei_irq_thread_read_client_message(cmpl_list,
- dev, mei_hdr);
+ dev_dbg(&dev->pdev->dev, "call mei_cl_irq_read_msg.\n");
+ dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
+ ret = mei_cl_irq_read_msg(dev, mei_hdr, cmpl_list);
if (ret)
goto end;
-
}
/* reset the number of slots and header */
@@ -436,7 +444,7 @@ int mei_irq_read_handler(struct mei_device *dev,
if (*slots == -EOVERFLOW) {
/* overflow - reset */
- dev_dbg(&dev->pdev->dev, "resetting due to slots overflow.\n");
+ dev_err(&dev->pdev->dev, "resetting due to slots overflow.\n");
/* set the event since message has been read */
ret = -ERANGE;
goto end;
--
1.8.1.2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists