* Re: [PATCH v2] PowerPC: kernel: need return the related error code when failure occurs
@ 2013-06-22 4:08 Chen Gang
0 siblings, 0 replies; 3+ messages in thread
From: Chen Gang @ 2013-06-22 4:08 UTC (permalink / raw)
To: paulus@samba.org, Michael Ellerman, Benjamin Herrenschmidt
Cc: Arnd Bergmann, zhangyanfei, Jiri Kosina,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Linux-Arch
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@asianux.com>
> ---
> 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
^ permalink raw reply [flat|nested] 3+ messages in thread[parent not found: <519B0ACA.6090008@asianux.com>]
[parent not found: <20130521081031.GA29303@iris.ozlabs.ibm.com>]
[parent not found: <519B3855.6050201@asianux.com>]
[parent not found: <519B3C72.9060405@asianux.com>]
* Re: [PATCH v2] PowerPC: kernel: need return the related error code when failure occurs [not found] ` <519B3C72.9060405@asianux.com> @ 2013-05-27 10:01 ` Chen Gang 2013-05-27 10:01 ` Chen Gang 0 siblings, 1 reply; 3+ messages in thread From: Chen Gang @ 2013-05-27 10:01 UTC (permalink / raw) To: Paul Mackerras Cc: Arnd Bergmann, Benjamin Herrenschmidt, zhangyanfei, Jiri Kosina, Michael Ellerman, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Linux-Arch 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@asianux.com> > --- > 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) > -- Chen Gang Asianux Corporation ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] PowerPC: kernel: need return the related error code when failure occurs 2013-05-27 10:01 ` Chen Gang @ 2013-05-27 10:01 ` Chen Gang 0 siblings, 0 replies; 3+ messages in thread From: Chen Gang @ 2013-05-27 10:01 UTC (permalink / raw) To: Paul Mackerras Cc: Arnd Bergmann, Benjamin Herrenschmidt, zhangyanfei, Jiri Kosina, Michael Ellerman, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Linux-Arch 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@asianux.com> > --- > 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) > -- Chen Gang Asianux Corporation ^ permalink raw reply [flat|nested] 3+ messages in thread
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2013-06-22 4:08 [PATCH v2] PowerPC: kernel: need return the related error code when failure occurs Chen Gang
[not found] <519B0ACA.6090008@asianux.com>
[not found] ` <20130521081031.GA29303@iris.ozlabs.ibm.com>
[not found] ` <519B3855.6050201@asianux.com>
[not found] ` <519B3C72.9060405@asianux.com>
2013-05-27 10:01 ` Chen Gang
2013-05-27 10:01 ` Chen Gang
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