Hello Maintainers:
Please help check this patch whether is OK, when you have time.
Thanks.
On 05/21/2013 05:20 PM, Chen Gang wrote:
>
> When error occurs, need return the related error code to let upper
> caller know about it.
>
> ppc_md.nvram_size() can return the error code (e.g. core99_nvram_size()
> in 'arch/powerpc/platforms/powermac/nvram.c').
>
> Also set ret value when only need it, so can save structions for normal
> cases.
>
> The original related patch: "f9ce299 [PATCH] powerpc: fix large nvram
> access".
>
>
> Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
> ---
> arch/powerpc/kernel/nvram_64.c | 20 ++++++++++++++------
> 1 files changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
> index 48fbc2b..8213ee1 100644
> --- a/arch/powerpc/kernel/nvram_64.c
> +++ b/arch/powerpc/kernel/nvram_64.c
> @@ -84,22 +84,30 @@ static ssize_t dev_nvram_read(struct file *file, char __user *buf,
> char *tmp = NULL;
> ssize_t size;
>
> - ret = -ENODEV;
> - if (!ppc_md.nvram_size)
> + if (!ppc_md.nvram_size) {
> + ret = -ENODEV;
> goto out;
> + }
>
> - ret = 0;
> size = ppc_md.nvram_size();
> - if (*ppos >= size || size < 0)
> + if (size < 0) {
> + ret = size;
> + goto out;
> + }
> +
> + if (*ppos >= size) {
> + ret = 0;
> goto out;
> + }
>
> count = min_t(size_t, count, size - *ppos);
> count = min(count, PAGE_SIZE);
>
> - ret = -ENOMEM;
> tmp = kmalloc(count, GFP_KERNEL);
> - if (!tmp)
> + if (!tmp) {
> + ret = -ENOMEM;
> goto out;
> + }
>
> ret = ppc_md.nvram_read(tmp, count, ppos);
> if (ret <= 0)
>
Thanks
--
Chen Gang
Asianux Corporation
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