lkml.org 
[lkml]   [2017]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
SubjectRe: [PATCH v2 2/5] powerpc: pseries: vio: match parent nodes with of_find_node_by_path
Date
Rob Herring <robh@kernel.org> writes:

> In preparation to remove the full path from device_node.full_name, use
> of_find_node_by_path instead of open coding with strcmp.
>
> Signed-off-by: Rob Herring <robh@kernel.org>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: linuxppc-dev@lists.ozlabs.org
> ---
> v2:
> - rebased to linux-next and removed spurious change fro patch 1.
>
> arch/powerpc/platforms/pseries/vio.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
> index aa5ca74316fa..5754572deb23 100644
> --- a/arch/powerpc/platforms/pseries/vio.c
> +++ b/arch/powerpc/platforms/pseries/vio.c
> @@ -1357,9 +1357,9 @@ struct vio_dev *vio_register_device_node(struct device_node *of_node)
> */
> parent_node = of_get_parent(of_node);
> if (parent_node) {
> - if (!strcmp(parent_node->full_name, "/ibm,platform-facilities"))
> + if (parent_node == of_find_node_by_path("/ibm,platform-facilities"))
> family = PFO;
> - else if (!strcmp(parent_node->full_name, "/vdevice"))
> + else if (parent_node == of_find_node_by_path("/vdevice"))
> family = VDEVICE;

This leaks references to the looked up nodes.

Both these nodes are defined in PAPR (our hypervisor spec), and both of
them must have a device_type, either "ibm,platform-facilities" or
"vdevice".

Looking at the commit that added the code I don't see any particular
reason it used the comparison against full_name, rather than using the
device_type.

So I'm inclined to do this instead:

diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
index 8a47f168476b..f26f906e6021 100644
--- a/arch/powerpc/platforms/pseries/vio.c
+++ b/arch/powerpc/platforms/pseries/vio.c
@@ -1357,9 +1357,9 @@ struct vio_dev *vio_register_device_node(struct device_node *of_node)
*/
parent_node = of_get_parent(of_node);
if (parent_node) {
- if (!strcmp(parent_node->full_name, "/ibm,platform-facilities"))
+ if (!strcmp(parent_node->type, "ibm,platform-facilities"))
family = PFO;
- else if (!strcmp(parent_node->full_name, "/vdevice"))
+ else if (!strcmp(parent_node->type, "vdevice"))
family = VDEVICE;
else {
pr_warn("%s: parent(%s) of %s not recognized.\n",

I've checked both Qemu and kvmtool add the device_type, and I'm fairly
confident that PowerVM does too. Anyway I'll test it on all the machines
I can find.

cheers

\
 
 \ /
  Last update: 2017-08-22 07:12    [W:0.184 / U:17.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site