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Date: Mon, 25 Jun 2012 16:46:38 +1000
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: Dong Aisheng <b29396@...escale.com>
Cc: linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
linuxppc-dev@...ts.ozlabs.org, grant.likely@...retlab.ca,
rob.herring@...xeda.com, galak@...nel.crashing.org,
paulus@...ba.org
Subject: Re: [PATCH v2 1/1] of: reform prom_update_property function
On Mon, 2012-06-25 at 14:28 +0800, Dong Aisheng wrote:
> From: Dong Aisheng <dong.aisheng@...aro.org>
>
> prom_update_property() currently fails if the property doesn't
> actually exist yet which isn't what we want. Change to add-or-update
> instead of update-only, then we can remove a lot duplicated lines.
>
> Suggested-by: Grant Likely <grant.likely@...retlab.ca>
> Signed-off-by: Dong Aisheng <dong.aisheng@...aro.org>
> ---
Grand, should I merge that via the powerpc tree or will you take care of
it ?
Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cheers,
Ben.
> ChangeLog v1->v2:
> * keep reconfig.c behavior the same as before after changes
> ---
> arch/powerpc/platforms/85xx/p1022_ds.c | 8 +-------
> arch/powerpc/platforms/pseries/mobility.c | 8 +-------
> arch/powerpc/platforms/pseries/reconfig.c | 16 ++++++----------
> drivers/of/base.c | 15 +++++++++++----
> fs/proc/proc_devtree.c | 5 +++++
> include/linux/of.h | 3 +--
> 6 files changed, 25 insertions(+), 30 deletions(-)
>
> diff --git a/arch/powerpc/platforms/85xx/p1022_ds.c b/arch/powerpc/platforms/85xx/p1022_ds.c
> index f700c81..d66631c 100644
> --- a/arch/powerpc/platforms/85xx/p1022_ds.c
> +++ b/arch/powerpc/platforms/85xx/p1022_ds.c
> @@ -348,13 +348,7 @@ void __init p1022_ds_pic_init(void)
> */
> static void __init disable_one_node(struct device_node *np, struct property *new)
> {
> - struct property *old;
> -
> - old = of_find_property(np, new->name, NULL);
> - if (old)
> - prom_update_property(np, new, old);
> - else
> - prom_add_property(np, new);
> + prom_update_property(np, new);
> }
>
> /* TRUE if there is a "video=fslfb" command-line parameter. */
> diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
> index 029a562..dd30b12 100644
> --- a/arch/powerpc/platforms/pseries/mobility.c
> +++ b/arch/powerpc/platforms/pseries/mobility.c
> @@ -67,7 +67,6 @@ static int update_dt_property(struct device_node *dn, struct property **prop,
> const char *name, u32 vd, char *value)
> {
> struct property *new_prop = *prop;
> - struct property *old_prop;
> int more = 0;
>
> /* A negative 'vd' value indicates that only part of the new property
> @@ -117,12 +116,7 @@ static int update_dt_property(struct device_node *dn, struct property **prop,
> }
>
> if (!more) {
> - old_prop = of_find_property(dn, new_prop->name, NULL);
> - if (old_prop)
> - prom_update_property(dn, new_prop, old_prop);
> - else
> - prom_add_property(dn, new_prop);
> -
> + prom_update_property(dn, new_prop);
> new_prop = NULL;
> }
>
> diff --git a/arch/powerpc/platforms/pseries/reconfig.c b/arch/powerpc/platforms/pseries/reconfig.c
> index 7b3bf76..db1b7b1 100644
> --- a/arch/powerpc/platforms/pseries/reconfig.c
> +++ b/arch/powerpc/platforms/pseries/reconfig.c
> @@ -432,7 +432,7 @@ static int do_update_property(char *buf, size_t bufsize)
> unsigned char *value;
> char *name, *end, *next_prop;
> int rc, length;
> - struct property *newprop, *oldprop;
> + struct property *newprop;
> buf = parse_node(buf, bufsize, &np);
> end = buf + bufsize;
>
> @@ -443,6 +443,9 @@ static int do_update_property(char *buf, size_t bufsize)
> if (!next_prop)
> return -EINVAL;
>
> + if (!strlen(name)
> + return -ENODEV;
> +
> newprop = new_property(name, length, value, NULL);
> if (!newprop)
> return -ENOMEM;
> @@ -450,18 +453,11 @@ static int do_update_property(char *buf, size_t bufsize)
> if (!strcmp(name, "slb-size") || !strcmp(name, "ibm,slb-size"))
> slb_set_size(*(int *)value);
>
> - oldprop = of_find_property(np, name,NULL);
> - if (!oldprop) {
> - if (strlen(name))
> - return prom_add_property(np, newprop);
> - return -ENODEV;
> - }
> -
> upd_value.node = np;
> upd_value.property = newprop;
> pSeries_reconfig_notify(PSERIES_UPDATE_PROPERTY, &upd_value);
>
> - rc = prom_update_property(np, newprop, oldprop);
> + rc = prom_update_property(np, newprop);
> if (rc)
> return rc;
>
> @@ -486,7 +482,7 @@ static int do_update_property(char *buf, size_t bufsize)
>
> rc = pSeries_reconfig_notify(action, value);
> if (rc) {
> - prom_update_property(np, oldprop, newprop);
> + prom_update_property(np, newprop);
> return rc;
> }
> }
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index d9bfd49..a14f109 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -1051,7 +1051,8 @@ int prom_remove_property(struct device_node *np, struct property *prop)
> }
>
> /*
> - * prom_update_property - Update a property in a node.
> + * prom_update_property - Update a property in a node, if the property does
> + * not exist, add it.
> *
> * Note that we don't actually remove it, since we have given out
> * who-knows-how-many pointers to the data using get-property.
> @@ -1059,13 +1060,19 @@ int prom_remove_property(struct device_node *np, struct property *prop)
> * and add the new property to the property list
> */
> int prom_update_property(struct device_node *np,
> - struct property *newprop,
> - struct property *oldprop)
> + struct property *newprop)
> {
> - struct property **next;
> + struct property **next, *oldprop;
> unsigned long flags;
> int found = 0;
>
> + if (!newprop->name)
> + return -EINVAL;
> +
> + oldprop = of_find_property(np, newprop->name, NULL);
> + if (!oldprop)
> + return prom_add_property(np, newprop);
> +
> write_lock_irqsave(&devtree_lock, flags);
> next = &np->properties;
> while (*next) {
> diff --git a/fs/proc/proc_devtree.c b/fs/proc/proc_devtree.c
> index 927cbd1..df7dd08 100644
> --- a/fs/proc/proc_devtree.c
> +++ b/fs/proc/proc_devtree.c
> @@ -101,6 +101,11 @@ void proc_device_tree_update_prop(struct proc_dir_entry *pde,
> {
> struct proc_dir_entry *ent;
>
> + if (!oldprop) {
> + proc_device_tree_add_prop(pde, newprop);
> + return;
> + }
> +
> for (ent = pde->subdir; ent != NULL; ent = ent->next)
> if (ent->data == oldprop)
> break;
> diff --git a/include/linux/of.h b/include/linux/of.h
> index 2ec1083..b27c871 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -260,8 +260,7 @@ extern int of_machine_is_compatible(const char *compat);
> extern int prom_add_property(struct device_node* np, struct property* prop);
> extern int prom_remove_property(struct device_node *np, struct property *prop);
> extern int prom_update_property(struct device_node *np,
> - struct property *newprop,
> - struct property *oldprop);
> + struct property *newprop);
>
> #if defined(CONFIG_OF_DYNAMIC)
> /* For updating the device tree at runtime */
--
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