Messages in this thread Patch in this message | | | Date | Tue, 21 May 2013 17:20:50 +0800 | From | Chen Gang <> | Subject | [PATCH v2] PowerPC: kernel: need return the related error code when failure occurs |
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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) -- 1.7.7.6
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