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Message-ID: <EADF0A36011179459010BDF5142A457501C9BF2AE2@pdsmsx502.ccr.corp.intel.com>
Date: Sun, 31 May 2009 14:43:46 +0800
From: "Xu, Dongxiao" <dongxiao.xu@...el.com>
To: "greg@...ah.com" <greg@...ah.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Nashif, Anas" <anas.nashif@...el.com>,
"Obara, Marcin" <marcin.obara@...el.com>
Subject: [Patch 04/08] Staging: heci - fix softirq safe to unsafe spinlock
issue
>From 971440bc39590f5baecf3e4553b15a56b17a5865 Mon Sep 17 00:00:00 2001
From: Dongxiao Xu <dongxiao.xu@...el.com>
Date: Sun, 31 May 2009 22:45:38 +0800
Subject: [PATCH] heci: fix softirq safe to unsafe spinlock issue.
When spinlock is nested, and the outside one is spin_lock_bh, the inner
spinlock should also be spin_lock_bh, otherwise it will bring softirq-safe
to softirq-unsafe lock conversion.
Signed-off-by: Dongxiao Xu <dongxiao.xu@...el.com>
---
drivers/staging/heci/heci_main.c | 24 ++++++++++++------------
drivers/staging/heci/interrupt.c | 8 ++++----
drivers/staging/heci/io_heci.c | 20 ++++++++++----------
3 files changed, 26 insertions(+), 26 deletions(-)
diff --git a/drivers/staging/heci/heci_main.c b/drivers/staging/heci/heci_main.c
index 5494ab5..1e5c26d 100644
--- a/drivers/staging/heci/heci_main.c
+++ b/drivers/staging/heci/heci_main.c
@@ -955,10 +955,10 @@ static ssize_t heci_read(struct file *file, char __user *ubuf,
}
err = heci_start_read(dev, if_num, file_ext);
- spin_lock(&file_ext->read_io_lock);
+ spin_lock_bh(&file_ext->read_io_lock);
if (err != 0 && err != -EBUSY) {
DBG("heci start read failure with status = %d\n", err);
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
rets = err;
goto out;
}
@@ -966,10 +966,10 @@ static ssize_t heci_read(struct file *file, char __user *ubuf,
&& !waitqueue_active(&file_ext->rx_wait)) {
if (file->f_flags & O_NONBLOCK) {
rets = -EAGAIN;
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
goto out;
}
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
if (wait_event_interruptible(file_ext->rx_wait,
(HECI_READ_COMPLETE == file_ext->reading_state
@@ -989,20 +989,20 @@ static ssize_t heci_read(struct file *file, char __user *ubuf,
rets = -EBUSY;
goto out;
}
- spin_lock(&file_ext->read_io_lock);
+ spin_lock_bh(&file_ext->read_io_lock);
}
priv_cb = file_ext->read_cb;
if (!priv_cb) {
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
return -ENODEV;
}
if (file_ext->reading_state != HECI_READ_COMPLETE) {
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
return 0;
}
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
/* now copy the data to user space */
copy_buffer:
DBG("priv_cb->response_buffer size - %d\n",
@@ -1040,11 +1040,11 @@ free:
list_del(&priv_cb_pos->cb_list);
spin_unlock_bh(&dev->device_lock);
heci_free_cb_private(priv_cb);
- spin_lock(&file_ext->read_io_lock);
+ spin_lock_bh(&file_ext->read_io_lock);
file_ext->reading_state = HECI_IDLE;
file_ext->read_cb = NULL;
file_ext->read_pending = 0;
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
out: DBG("end heci read rets= %d\n", rets);
return rets;
}
@@ -1106,11 +1106,11 @@ static ssize_t heci_write(struct file *file, const char __user *ubuf,
list_del(&priv_write_cb->cb_list);
heci_free_cb_private(priv_write_cb);
priv_write_cb = NULL;
- spin_lock(&file_ext->read_io_lock);
+ spin_lock_bh(&file_ext->read_io_lock);
file_ext->reading_state = HECI_IDLE;
file_ext->read_cb = NULL;
file_ext->read_pending = 0;
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
}
} else if (file_ext->reading_state == HECI_IDLE &&
file_ext->read_pending == 0)
diff --git a/drivers/staging/heci/interrupt.c b/drivers/staging/heci/interrupt.c
index aacd262..2db1851 100644
--- a/drivers/staging/heci/interrupt.c
+++ b/drivers/staging/heci/interrupt.c
@@ -622,7 +622,7 @@ static int heci_bh_read_client_message(struct io_heci_list *complete_list,
priv_cb_pos->file_private;
if ((file_ext != NULL) &&
(_heci_bh_state_ok(file_ext, heci_hdr))) {
- spin_lock(&file_ext->read_io_lock);
+ spin_lock_bh(&file_ext->read_io_lock);
file_ext->reading_state = HECI_READING;
buffer = (unsigned char *)
(priv_cb_pos->response_buffer.data +
@@ -636,7 +636,7 @@ static int heci_bh_read_client_message(struct io_heci_list *complete_list,
priv_cb_pos->information) {
DBG("message overflow.\n");
list_del(&priv_cb_pos->cb_list);
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
return -ENOMEM;
}
if (buffer) {
@@ -647,7 +647,7 @@ static int heci_bh_read_client_message(struct io_heci_list *complete_list,
if (heci_hdr->msg_complete) {
file_ext->status = 0;
list_del(&priv_cb_pos->cb_list);
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
DBG("completed read host client = %d,"
"ME client = %d, "
"data length = %lu\n",
@@ -662,7 +662,7 @@ static int heci_bh_read_client_message(struct io_heci_list *complete_list,
list_add_tail(&priv_cb_pos->cb_list,
&complete_list->heci_cb.cb_list);
} else {
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
}
break;
diff --git a/drivers/staging/heci/io_heci.c b/drivers/staging/heci/io_heci.c
index 8a44fd5..8131470 100644
--- a/drivers/staging/heci/io_heci.c
+++ b/drivers/staging/heci/io_heci.c
@@ -648,26 +648,26 @@ int heci_start_read(struct iamt_heci_device *dev, int if_num,
}
spin_unlock_bh(&dev->device_lock);
DBG("check if read is pending.\n");
- spin_lock(&file_ext->read_io_lock);
+ spin_lock_bh(&file_ext->read_io_lock);
if ((file_ext->read_pending) || (file_ext->read_cb != NULL)) {
DBG("read is pending.\n");
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
return -EBUSY;
}
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
priv_cb = kzalloc(sizeof(struct heci_cb_private), GFP_KERNEL);
if (!priv_cb)
return -ENOMEM;
- spin_lock(&file_ext->read_io_lock);
+ spin_lock_bh(&file_ext->read_io_lock);
DBG("allocation call back success\n"
"host client = %d, ME client = %d\n",
file_ext->host_client_id, file_ext->me_client_id);
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
spin_lock_bh(&dev->device_lock);
- spin_lock(&file_ext->read_io_lock);
+ spin_lock_bh(&file_ext->read_io_lock);
for (i = 0; i < dev->num_heci_me_clients; i++) {
if (dev->me_clients[i].client_id == file_ext->me_client_id)
break;
@@ -675,7 +675,7 @@ int heci_start_read(struct iamt_heci_device *dev, int if_num,
}
BUG_ON(dev->me_clients[i].client_id != file_ext->me_client_id);
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
if (i == dev->num_heci_me_clients) {
rets = -ENODEV;
goto unlock;
@@ -695,13 +695,13 @@ int heci_start_read(struct iamt_heci_device *dev, int if_num,
priv_cb->information = 0;
priv_cb->file_private = (void *) file_ext;
spin_lock_bh(&dev->device_lock);
- spin_lock(&file_ext->read_io_lock);
+ spin_lock_bh(&file_ext->read_io_lock);
file_ext->read_cb = priv_cb;
if (dev->host_buffer_is_empty) {
dev->host_buffer_is_empty = 0;
if (!heci_send_flow_control(dev, file_ext)) {
rets = -ENODEV;
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
goto unlock;
} else {
list_add_tail(&priv_cb->cb_list,
@@ -711,7 +711,7 @@ int heci_start_read(struct iamt_heci_device *dev, int if_num,
list_add_tail(&priv_cb->cb_list,
&dev->ctrl_wr_list.heci_cb.cb_list);
}
- spin_unlock(&file_ext->read_io_lock);
+ spin_unlock_bh(&file_ext->read_io_lock);
spin_unlock_bh(&dev->device_lock);
return rets;
unlock:
--
1.6.0.rc1
--
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