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| author | Chen Gang <gang.chen@asianux.com> | 2013-05-21 17:20:50 +0800 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-07-01 11:46:56 +1000 |
| commit | 7029705a9d0544186c29ae09708b3e5adb512835 (patch) | |
| tree | 5156e8edaa013c77b3fd007ab83ddff873d9d622 /arch/powerpc | |
| parent | cce606feb425093c8371089d392e336d186e125b (diff) | |
| download | blackbird-op-linux-7029705a9d0544186c29ae09708b3e5adb512835.tar.gz blackbird-op-linux-7029705a9d0544186c29ae09708b3e5adb512835.zip | |
powerpc/nvram64: Need return the related error code on failure occurs
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.
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | 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 48fbc2b97e95..8213ee1eb05a 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) |
