Re: [PATCH] mmc: change to use kmalloc

[yalin wang <yalin.wang2010@gmail.com>]

> On Nov 12, 2015, at 05:57, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
> 
> On Wed, Nov 11, 2015 at 11:17 PM, Peter Hurley <peter@hurleysoftware.com> wrote:
>> On 11/11/2015 12:02 PM, Alim Akhtar wrote:
>>> Hi Yalin,
>>> 
>>> On Wed, Nov 11, 2015 at 9:53 AM, yalin wang <yalin.wang2010@gmail.com> wrote:
>>>> Use kmalloc instead of kzalloc, zero the memory is not needed.
>>>> 
>>> why you want to do this? what problem you faces, and how this resolves the same?
>> 
>> The patch fixes an inefficiency: explicitly zeroing memory that is then
>> immediately overwritten 6 lines below is wasteful.
> 
> It might fix previous kzalloc as well, though better not to do since
> it's error prone.
> 
yeah,  i will send a new patch ,



>> 
>> Regards,
>> Peter Hurley
>> 
>>>> Signed-off-by: yalin wang <yalin.wang2010@gmail.com>
>>>> ---
>>>> drivers/mmc/card/block.c | 2 +-
>>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>> 
>>>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>>>> index 23b6c8e..975cd3e 100644
>>>> --- a/drivers/mmc/card/block.c
>>>> +++ b/drivers/mmc/card/block.c
>>>> @@ -365,7 +365,7 @@ static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
>>>>        if (!idata->buf_bytes)
>>>>                return idata;
>>>> 
>>>> -       idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
>>>> +       idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
>>>>        if (!idata->buf) {
>>>>                err = -ENOMEM;
>>>>                goto idata_err;
>>>> --
>>>> 1.9.1
>> 
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> 
> 
> 
> -- 
> With Best Regards,
> Andy Shevchenko