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Date: Wed, 05 Nov 2014 20:01:29 +0000
From: Grant Likely <grant.likely@...retlab.ca>
To: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Cc: Rob Herring <robherring2@...il.com>,
Stephen Warren <swarren@...dotorg.org>,
Matt Porter <matt.porter@...aro.org>,
Koen Kooi <koen@...inion.thruhere.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alison Chaiken <Alison_Chaiken@...tor.com>,
Dinh Nguyen <dinh.linux@...il.com>,
Jan Lubbe <jluebbe@...net.de>,
Alexander Sverdlin <alexander.sverdlin@....com>,
Michael Stickel <ms@...able.de>,
Guenter Roeck <linux@...ck-us.net>,
Dirk Behme <dirk.behme@...il.com>,
Alan Tull <delicious.quinoa@...il.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
Michael Bohan <mbohan@...eaurora.org>,
Ionut Nicu <ioan.nicu.ext@....com>,
Michal Simek <monstr@...str.eu>,
Matt Ranostay <mranostay@...il.com>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Pete Popov <pete.popov@...sulko.com>,
Dan Malek <dan.malek@...sulko.com>,
Georgi Vlaev <georgi.vlaev@...sulko.com>,
Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: Re: [PATCH 4/5] of: Add old prop argument on
OF_RECONFIG_UPDATE_PROPERTY
On Tue, 28 Oct 2014 22:33:52 +0200
, Pantelis Antoniou <pantelis.antoniou@...sulko.com>
wrote:
> The notifier now includes the old_prop argument when updating
> properties, propagate this API to changeset internals while
> also retaining the old behaviour of retrieving the old_property
> when NULL is passed.
>
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
I'm still fuzzy on the need for this patch. Is this just an optimization
so that the property doesn't get looked up twice? Or is there a reason
when the oldprop really needs to be passed in explicitly?
g.
> ---
> drivers/of/dynamic.c | 18 ++++++++++++++----
> drivers/of/selftest.c | 2 +-
> include/linux/of.h | 20 +++++++++++++-------
> 3 files changed, 28 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
> index 8e8b614..9eb8528 100644
> --- a/drivers/of/dynamic.c
> +++ b/drivers/of/dynamic.c
> @@ -627,6 +627,7 @@ int of_changeset_revert(struct of_changeset *ocs)
> * @action: action to perform
> * @np: Pointer to device node
> * @prop: Pointer to property
> + * @old_prop: Pointer to old property (if updating)
> *
> * On action being one of:
> * + OF_RECONFIG_ATTACH_NODE
> @@ -637,10 +638,21 @@ int of_changeset_revert(struct of_changeset *ocs)
> * Returns 0 on success, a negative error value in case of an error.
> */
> int of_changeset_action(struct of_changeset *ocs, unsigned long action,
> - struct device_node *np, struct property *prop)
> + struct device_node *np, struct property *prop,
> + struct property *oldprop)
> {
> struct of_changeset_entry *ce;
>
> + /* in case someone passed NULL as old_prop, find it */
> + if (action == OF_RECONFIG_UPDATE_PROPERTY && prop && !oldprop) {
> + oldprop = of_find_property(np, prop->name, NULL);
> + if (!oldprop) {
> + pr_err("%s: Failed to find old_prop for \"%s/%s\"\n",
> + __func__, np->full_name, prop->name);
> + return -EINVAL;
> + }
> + }
> +
> ce = kzalloc(sizeof(*ce), GFP_KERNEL);
> if (!ce) {
> pr_err("%s: Failed to allocate\n", __func__);
> @@ -650,9 +662,7 @@ int of_changeset_action(struct of_changeset *ocs, unsigned long action,
> ce->action = action;
> ce->np = of_node_get(np);
> ce->prop = prop;
> -
> - if (action == OF_RECONFIG_UPDATE_PROPERTY && prop)
> - ce->old_prop = of_find_property(np, prop->name, NULL);
> + ce->old_prop = oldprop;
>
> /* add it to the list */
> list_add_tail(&ce->node, &ocs->entries);
> diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
> index 7800127..16102fd 100644
> --- a/drivers/of/selftest.c
> +++ b/drivers/of/selftest.c
> @@ -427,7 +427,7 @@ static void __init of_selftest_changeset(void)
> selftest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
> selftest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
> selftest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop\n");
> - selftest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
> + selftest(!of_changeset_update_property(&chgset, parent, ppupdate, NULL), "fail update prop\n");
> selftest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
> mutex_lock(&of_mutex);
> selftest(!of_changeset_apply(&chgset), "apply failed\n");
> diff --git a/include/linux/of.h b/include/linux/of.h
> index 6545e7a..71d25aa 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -830,36 +830,42 @@ extern int of_changeset_apply(struct of_changeset *ocs);
> extern int of_changeset_revert(struct of_changeset *ocs);
> extern int of_changeset_action(struct of_changeset *ocs,
> unsigned long action, struct device_node *np,
> - struct property *prop);
> + struct property *prop, struct property *old_prop);
>
> static inline int of_changeset_attach_node(struct of_changeset *ocs,
> struct device_node *np)
> {
> - return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
> + return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL,
> + NULL);
> }
>
> static inline int of_changeset_detach_node(struct of_changeset *ocs,
> struct device_node *np)
> {
> - return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
> + return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL,
> + NULL);
> }
>
> static inline int of_changeset_add_property(struct of_changeset *ocs,
> struct device_node *np, struct property *prop)
> {
> - return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
> + return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop,
> + NULL);
> }
>
> static inline int of_changeset_remove_property(struct of_changeset *ocs,
> struct device_node *np, struct property *prop)
> {
> - return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
> + return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop,
> + NULL);
> }
>
> static inline int of_changeset_update_property(struct of_changeset *ocs,
> - struct device_node *np, struct property *prop)
> + struct device_node *np, struct property *prop,
> + struct property *old_prop)
> {
> - return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
> + return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop,
> + old_prop);
> }
> #endif
>
> --
> 1.7.12
>
--
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