[v2] powerpc/pseries: Correct string length in pseries_of_derive_parent()

[Michael Ellerman]

On Tue, 2015-27-10 at 15:46:47 UTC, Nathan Fontenot wrote:
> Commit a030e1e4bbd085bbcfd0a23f8d355fcd41f39bed make a change to use
> kstrndup() instead of kmalloc() + strlcpy() in the pseries_of_derive_parent()
> routine that introduces a subtle change in the parent path name generated.
> The kstrndup() routine will copy n characters followed by a terminating null,
> whereas strlcpy() will copy n-1 characters and add a terminating null.
> 
> This slight difference results in having a parent path that includes the
> tailing '/' character, "/cpus/" vs. "/cpus". This then causes the subsequent
> call to of_find_node_by_path() to fail, and in the case of DLPAR add
> operations the DLPAR request fails.
> 
> This patch decrements the pointer returned from kbasename() to point to the
> '/' character before the base name instead of the base name. This then
> adjusts the string length calculations to not include the trailing '/'
> in the parent path name.
> 
> Signed-off-by: Nathan Fontenot <nfont at linux.vnet.ibm.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/f755ecfb8cec7b19dff84295

cheers