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Date: Sun, 27 Sep 2015 19:43:18 +0530
From: Chandra S Gorentla <csgorentla@...il.com>
To: gregkh@...uxfoundation.org
Cc: johnny.kim@...el.com, rachel.kim@...el.com, dean.lee@...el.com,
chris.park@...el.com, linux-wireless@...r.kernel.org,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
sudipm.mukherjee@...il.com,
Chandra S Gorentla <csgorentla@...il.com>
Subject: [PATCH] drivers: staging: wilc1000: Replace message queue with standard Linux lists
The message queue is replaced with standard Linux linked list. A check for
return value of receive method is added.
Signed-off-by: Chandra S Gorentla <csgorentla@...il.com>
---
drivers/staging/wilc1000/host_interface.c | 7 +++-
drivers/staging/wilc1000/wilc_msgqueue.c | 62 ++++++++++++++-----------------
drivers/staging/wilc1000/wilc_platform.h | 5 ++-
3 files changed, 36 insertions(+), 38 deletions(-)
diff --git a/drivers/staging/wilc1000/host_interface.c b/drivers/staging/wilc1000/host_interface.c
index 62f4a8a..8d0776f 100644
--- a/drivers/staging/wilc1000/host_interface.c
+++ b/drivers/staging/wilc1000/host_interface.c
@@ -4304,11 +4304,16 @@ static int hostIFthread(void *pvArg)
u32 u32Ret;
struct host_if_msg msg;
tstrWILC_WFIDrv *pstrWFIDrv;
+ int recv_ret;
memset(&msg, 0, sizeof(struct host_if_msg));
while (1) {
- wilc_mq_recv(&gMsgQHostIF, &msg, sizeof(struct host_if_msg), &u32Ret);
+ recv_ret = wilc_mq_recv(&gMsgQHostIF, &msg,
+ sizeof(struct host_if_msg), &u32Ret);
+ if (recv_ret)
+ continue;
+
pstrWFIDrv = (tstrWILC_WFIDrv *)msg.drvHandler;
if (msg.id == HOST_IF_MSG_EXIT) {
PRINT_D(GENERIC_DBG, "THREAD: Exiting HostIfThread\n");
diff --git a/drivers/staging/wilc1000/wilc_msgqueue.c b/drivers/staging/wilc1000/wilc_msgqueue.c
index 869736a..67617d5 100644
--- a/drivers/staging/wilc1000/wilc_msgqueue.c
+++ b/drivers/staging/wilc1000/wilc_msgqueue.c
@@ -12,9 +12,15 @@
*/
int wilc_mq_create(WILC_MsgQueueHandle *pHandle)
{
+ pHandle->msg_cache = kmem_cache_create("wilc_message_queue",
+ sizeof(Message),
+ 0, SLAB_POISON, NULL);
+ if (!pHandle->msg_cache)
+ return -ENOMEM;
+
spin_lock_init(&pHandle->strCriticalSection);
sema_init(&pHandle->hSem, 0);
- pHandle->pstrMessageList = NULL;
+ INIT_LIST_HEAD(&pHandle->msg_list_head);
pHandle->u32ReceiversCount = 0;
pHandle->bExiting = false;
return 0;
@@ -28,6 +34,7 @@ int wilc_mq_create(WILC_MsgQueueHandle *pHandle)
*/
int wilc_mq_destroy(WILC_MsgQueueHandle *pHandle)
{
+ Message *msg;
pHandle->bExiting = true;
/* Release any waiting receiver thread. */
@@ -36,13 +43,16 @@ int wilc_mq_destroy(WILC_MsgQueueHandle *pHandle)
pHandle->u32ReceiversCount--;
}
- while (pHandle->pstrMessageList) {
- Message *pstrMessge = pHandle->pstrMessageList->pstrNext;
-
- kfree(pHandle->pstrMessageList);
- pHandle->pstrMessageList = pstrMessge;
+ while (!list_empty(&pHandle->msg_list_head)) {
+ msg = list_first_entry(&pHandle->msg_list_head,
+ Message, link);
+ list_del(&msg->link);
+ kfree(msg->pvBuffer);
+ kmem_cache_free(pHandle->msg_cache, msg);
}
+ kmem_cache_destroy(pHandle->msg_cache);
+
return 0;
}
@@ -74,41 +84,28 @@ int wilc_mq_send(WILC_MsgQueueHandle *pHandle,
spin_lock_irqsave(&pHandle->strCriticalSection, flags);
/* construct a new message */
- pstrMessage = kmalloc(sizeof(Message), GFP_ATOMIC);
- if (!pstrMessage)
+ pstrMessage = kmem_cache_zalloc(pHandle->msg_cache, GFP_ATOMIC);
+ if (!pstrMessage) {
+ spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
return -ENOMEM;
+ }
pstrMessage->u32Length = u32SendBufferSize;
- pstrMessage->pstrNext = NULL;
pstrMessage->pvBuffer = kmalloc(u32SendBufferSize, GFP_ATOMIC);
if (!pstrMessage->pvBuffer) {
+ kmem_cache_free(pHandle->msg_cache, pstrMessage);
result = -ENOMEM;
goto ERRORHANDLER;
}
memcpy(pstrMessage->pvBuffer, pvSendBuffer, u32SendBufferSize);
/* add it to the message queue */
- if (!pHandle->pstrMessageList) {
- pHandle->pstrMessageList = pstrMessage;
- } else {
- Message *pstrTailMsg = pHandle->pstrMessageList;
-
- while (pstrTailMsg->pstrNext)
- pstrTailMsg = pstrTailMsg->pstrNext;
-
- pstrTailMsg->pstrNext = pstrMessage;
- }
+ list_add_tail(&pstrMessage->link, &pHandle->msg_list_head);
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
up(&pHandle->hSem);
ERRORHANDLER:
- /* error occured, free any allocations */
- if (pstrMessage) {
- kfree(pstrMessage->pvBuffer);
- kfree(pstrMessage);
- }
-
return result;
}
@@ -144,11 +141,6 @@ int wilc_mq_recv(WILC_MsgQueueHandle *pHandle,
down(&pHandle->hSem);
/* other non-timeout scenarios */
- if (result) {
- PRINT_ER("Non-timeout\n");
- return result;
- }
-
if (pHandle->bExiting) {
PRINT_ER("pHandle fail\n");
return -EFAULT;
@@ -156,12 +148,13 @@ int wilc_mq_recv(WILC_MsgQueueHandle *pHandle,
spin_lock_irqsave(&pHandle->strCriticalSection, flags);
- pstrMessage = pHandle->pstrMessageList;
- if (!pstrMessage) {
+ if (list_empty(&pHandle->msg_list_head)) {
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
PRINT_ER("pstrMessage is null\n");
return -EFAULT;
}
+
+ pstrMessage = list_first_entry(&pHandle->msg_list_head, Message, link);
/* check buffer size */
if (u32RecvBufferSize < pstrMessage->u32Length) {
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
@@ -175,10 +168,9 @@ int wilc_mq_recv(WILC_MsgQueueHandle *pHandle,
memcpy(pvRecvBuffer, pstrMessage->pvBuffer, pstrMessage->u32Length);
*pu32ReceivedLength = pstrMessage->u32Length;
- pHandle->pstrMessageList = pstrMessage->pstrNext;
-
+ list_del(&pstrMessage->link);
kfree(pstrMessage->pvBuffer);
- kfree(pstrMessage);
+ kmem_cache_free(pHandle->msg_cache, pstrMessage);
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
diff --git a/drivers/staging/wilc1000/wilc_platform.h b/drivers/staging/wilc1000/wilc_platform.h
index b763616..3871658 100644
--- a/drivers/staging/wilc1000/wilc_platform.h
+++ b/drivers/staging/wilc1000/wilc_platform.h
@@ -20,7 +20,7 @@
typedef struct __Message_struct {
void *pvBuffer;
u32 u32Length;
- struct __Message_struct *pstrNext;
+ struct list_head link;
} Message;
typedef struct __MessageQueue_struct {
@@ -28,7 +28,8 @@ typedef struct __MessageQueue_struct {
spinlock_t strCriticalSection;
bool bExiting;
u32 u32ReceiversCount;
- Message *pstrMessageList;
+ struct list_head msg_list_head;
+ struct kmem_cache *msg_cache;
} WILC_MsgQueueHandle;
--
2.1.4
--
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