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Date: Wed, 20 Jun 2012 21:53:38 +0800
From: Dong Aisheng <aisheng.dong@...escale.com>
To: Rob Herring <robherring2@...il.com>
CC: Dong Aisheng-B29396 <B29396@...escale.com>,
"devicetree-discuss@...ts.ozlabs.org"
<devicetree-discuss@...ts.ozlabs.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Kumar Gala <galak@...nel.crashing.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 1/1] of: reform prom_update_property function
On Wed, Jun 20, 2012 at 09:07:56PM +0800, Rob Herring wrote:
> On 06/20/2012 12:54 AM, 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>
> > ---
>
> Looks fine, but you need to cc powerpc maintainers.
>
Sorry, i missed that.
Thanks for reminder.
Regards
Dong Aisheng
>
> > arch/powerpc/platforms/85xx/p1022_ds.c | 8 +-------
> > arch/powerpc/platforms/pseries/mobility.c | 8 +-------
> > arch/powerpc/platforms/pseries/reconfig.c | 13 +++----------
> > drivers/of/base.c | 15 +++++++++++----
> > fs/proc/proc_devtree.c | 5 +++++
> > include/linux/of.h | 3 +--
> > 6 files changed, 22 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..4c92f1c 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;
> >
> > @@ -450,18 +450,11 @@ 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 +479,7 @@ 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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