2013-05-23 21:16:37

by David Milburn

Subject: [PATCH] mtip32xx: dynamically allocate buffer in debugfs functions

Dynamically allocate buf to prevent warnings:

drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_device_status’:
drivers/block/mtip32xx/mtip32xx.c:2823: warning: the frame size of 1056 bytes is larger than 1024 bytes
drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_registers’:
drivers/block/mtip32xx/mtip32xx.c:2894: warning: the frame size of 1056 bytes is larger than 1024 bytes
drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_flags’:
drivers/block/mtip32xx/mtip32xx.c:2917: warning: the frame size of 1056 bytes is larger than 1024 bytes

Signed-off-by: David Milburn <[email protected]>
---
drivers/block/mtip32xx/mtip32xx.c | 47 +++++++++++++++++++++++++++++--------
1 files changed, 37 insertions(+), 10 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 847107e..baa0996 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -2806,34 +2806,51 @@ static ssize_t show_device_status(struct device_driver *drv, char *buf)
static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
size_t len, loff_t *offset)
{
+ struct driver_data *dd = (struct driver_data *)f->private_data;
int size = *offset;
- char buf[MTIP_DFS_MAX_BUF_SIZE];
+ char *buf;
+ int rv = 0;

if (!len || *offset)
return 0;

+ buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
+ if (!buf) {
+ dev_err(&dd->pdev->dev,
+ "Memory allocation: status buffer\n");
+ return -ENOMEM;
+ }
+
size += show_device_status(NULL, buf);

*offset = size <= len ? size : len;
size = copy_to_user(ubuf, buf, *offset);
if (size)
- return -EFAULT;
+ rv = -EFAULT;

- return *offset;
+ kfree(buf);
+ return rv ? rv : *offset;
}

static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
size_t len, loff_t *offset)
{
struct driver_data *dd = (struct driver_data *)f->private_data;
- char buf[MTIP_DFS_MAX_BUF_SIZE];
+ char *buf;
u32 group_allocated;
int size = *offset;
- int n;
+ int n, rv = 0;

if (!len || size)
return 0;

+ buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
+ if (!buf) {
+ dev_err(&dd->pdev->dev,
+ "Memory allocation: register buffer\n");
+ return -ENOMEM;
+ }
+
size += sprintf(&buf[size], "H/ S ACTive : [ 0x");

for (n = dd->slot_groups-1; n >= 0; n--)
@@ -2888,21 +2905,30 @@ static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
*offset = size <= len ? size : len;
size = copy_to_user(ubuf, buf, *offset);
if (size)
- return -EFAULT;
+ rv = -EFAULT;

- return *offset;
+ kfree(buf);
+ return rv ? rv : *offset;
}

static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
size_t len, loff_t *offset)
{
struct driver_data *dd = (struct driver_data *)f->private_data;
- char buf[MTIP_DFS_MAX_BUF_SIZE];
+ char *buf;
int size = *offset;
+ int rv = 0;

if (!len || size)
return 0;

+ buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
+ if (!buf) {
+ dev_err(&dd->pdev->dev,
+ "Memory allocation: flag buffer\n");
+ return -ENOMEM;
+ }
+
size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
dd->port->flags);
size += sprintf(&buf[size], "Flag-dd : [ %08lX ]\n",
@@ -2911,9 +2937,10 @@ static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
*offset = size <= len ? size : len;
size = copy_to_user(ubuf, buf, *offset);
if (size)
- return -EFAULT;
+ rv = -EFAULT;

- return *offset;
+ kfree(buf);
+ return rv ? rv : *offset;
}

static const struct file_operations mtip_device_status_fops = {

2013-07-12 22:59:20

by Asai Thambi SP

Subject: Re: [PATCH] mtip32xx: dynamically allocate buffer in debugfs functions

On 5/23/2013 2:23 PM, David Milburn wrote:

> Dynamically allocate buf to prevent warnings:
>
> drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_device_status’:
> drivers/block/mtip32xx/mtip32xx.c:2823: warning: the frame size of 1056 bytes is larger than 1024 bytes
> drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_registers’:
> drivers/block/mtip32xx/mtip32xx.c:2894: warning: the frame size of 1056 bytes is larger than 1024 bytes
> drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_flags’:
> drivers/block/mtip32xx/mtip32xx.c:2917: warning: the frame size of 1056 bytes is larger than 1024 bytes
>
> Signed-off-by: David Milburn <[email protected]>


Acked-by: Asai Thambi S P <[email protected]>

> ---
> drivers/block/mtip32xx/mtip32xx.c | 47 +++++++++++++++++++++++++++++--------
> 1 files changed, 37 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
> index 847107e..baa0996 100644
> --- a/drivers/block/mtip32xx/mtip32xx.c
> +++ b/drivers/block/mtip32xx/mtip32xx.c
> @@ -2806,34 +2806,51 @@ static ssize_t show_device_status(struct device_driver *drv, char *buf)
> static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
> size_t len, loff_t *offset)
> {
> + struct driver_data *dd = (struct driver_data *)f->private_data;
> int size = *offset;
> - char buf[MTIP_DFS_MAX_BUF_SIZE];
> + char *buf;
> + int rv = 0;
>
> if (!len || *offset)
> return 0;
>
> + buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
> + if (!buf) {
> + dev_err(&dd->pdev->dev,
> + "Memory allocation: status buffer\n");
> + return -ENOMEM;
> + }
> +
> size += show_device_status(NULL, buf);
>
> *offset = size <= len ? size : len;
> size = copy_to_user(ubuf, buf, *offset);
> if (size)
> - return -EFAULT;
> + rv = -EFAULT;
>
> - return *offset;
> + kfree(buf);
> + return rv ? rv : *offset;
> }
>
> static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
> size_t len, loff_t *offset)
> {
> struct driver_data *dd = (struct driver_data *)f->private_data;
> - char buf[MTIP_DFS_MAX_BUF_SIZE];
> + char *buf;
> u32 group_allocated;
> int size = *offset;
> - int n;
> + int n, rv = 0;
>
> if (!len || size)
> return 0;
>
> + buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
> + if (!buf) {
> + dev_err(&dd->pdev->dev,
> + "Memory allocation: register buffer\n");
> + return -ENOMEM;
> + }
> +
> size += sprintf(&buf[size], "H/ S ACTive : [ 0x");
>
> for (n = dd->slot_groups-1; n >= 0; n--)
> @@ -2888,21 +2905,30 @@ static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
> *offset = size <= len ? size : len;
> size = copy_to_user(ubuf, buf, *offset);
> if (size)
> - return -EFAULT;
> + rv = -EFAULT;
>
> - return *offset;
> + kfree(buf);
> + return rv ? rv : *offset;
> }
>
> static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
> size_t len, loff_t *offset)
> {
> struct driver_data *dd = (struct driver_data *)f->private_data;
> - char buf[MTIP_DFS_MAX_BUF_SIZE];
> + char *buf;
> int size = *offset;
> + int rv = 0;
>
> if (!len || size)
> return 0;
>
> + buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
> + if (!buf) {
> + dev_err(&dd->pdev->dev,
> + "Memory allocation: flag buffer\n");
> + return -ENOMEM;
> + }
> +
> size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
> dd->port->flags);
> size += sprintf(&buf[size], "Flag-dd : [ %08lX ]\n",
> @@ -2911,9 +2937,10 @@ static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
> *offset = size <= len ? size : len;
> size = copy_to_user(ubuf, buf, *offset);
> if (size)
> - return -EFAULT;
> + rv = -EFAULT;
>
> - return *offset;
> + kfree(buf);
> + return rv ? rv : *offset;
> }
>
> static const struct file_operations mtip_device_status_fops = {
> --
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>

2013-09-17 18:19:13

by Asai Thambi SP

Subject: Re: [PATCH] mtip32xx: dynamically allocate buffer in debugfs functions

On 07/12/2013 3:59 PM, Asai Thambi S P wrote:
> On 5/23/2013 2:23 PM, David Milburn wrote:
>
>> Dynamically allocate buf to prevent warnings:
>>
>> drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_device_status’:
>> drivers/block/mtip32xx/mtip32xx.c:2823: warning: the frame size of 1056 bytes is larger than 1024 bytes
>> drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_registers’:
>> drivers/block/mtip32xx/mtip32xx.c:2894: warning: the frame size of 1056 bytes is larger than 1024 bytes
>> drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_flags’:
>> drivers/block/mtip32xx/mtip32xx.c:2917: warning: the frame size of 1056 bytes is larger than 1024 bytes
>>
>> Signed-off-by: David Milburn <[email protected]>
>
> Acked-by: Asai Thambi S P <[email protected]>
>
Jens,

Please include this patch too for 3.12.

--
Regards,
Asai

2013-09-17 18:22:10

by Jens Axboe

Subject: Re: [PATCH] mtip32xx: dynamically allocate buffer in debugfs functions

On 09/17/2013 12:18 PM, Asai Thambi S P wrote:
> On 07/12/2013 3:59 PM, Asai Thambi S P wrote:
>> On 5/23/2013 2:23 PM, David Milburn wrote:
>>
>>> Dynamically allocate buf to prevent warnings:
>>>
>>> drivers/block/mtip32xx/mtip32xx.c: In function
>>> ‘mtip_hw_read_device_status’:
>>> drivers/block/mtip32xx/mtip32xx.c:2823: warning: the frame size of
>>> 1056 bytes is larger than 1024 bytes
>>> drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_registers’:
>>> drivers/block/mtip32xx/mtip32xx.c:2894: warning: the frame size of
>>> 1056 bytes is larger than 1024 bytes
>>> drivers/block/mtip32xx/mtip32xx.c: In function ‘mtip_hw_read_flags’:
>>> drivers/block/mtip32xx/mtip32xx.c:2917: warning: the frame size of
>>> 1056 bytes is larger than 1024 bytes
>>>
>>> Signed-off-by: David Milburn <[email protected]>
>>
>> Acked-by: Asai Thambi S P <[email protected]>
>>
> Jens,
>
> Please include this patch too for 3.12.

Queued up.

--
Jens Axboe