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Date: Tue, 7 Jun 2011 21:29:25 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Janusz Krzysztofik <jkrzyszt@....icnet.pl>
Cc: linux-pm@...ts.linux-foundation.org, Pavel Machek <pavel@....cz>,
Len Brown <len.brown@...el.com>,
"Greg Kroah-Hartman" <gregkh@...e.de>,
linux-kernel@...r.kernel.org,
"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 3.0-rc1] PM / runtime: fix broken iteration over clock ids
On Monday, June 06, 2011, Janusz Krzysztofik wrote:
> On Mon 06 Jun 2011 at 19:47:36 Rafael J. Wysocki wrote:
> > Hi,
> >
> > On Sunday, June 05, 2011, Janusz Krzysztofik wrote:
> > > In its current form, pm_runtime_clk_notify() iterates through sub-
> > > strings of pm_clk_notifier_block.con_ids[0] rather than consecutive
> > > pm_clk_notifier_block.con_ids[] elements. As a noticeable result,
> > > McBSP1 port no longer worked for me on updated
> > > arch/arm/mach-omap1/pm_bus.c (commit
> > > 600b776eb39a13a28b090ba9efceb0c69d4508aa, "OMAP1 / PM: Use generic
> > > clock manipulation routines for runtime PM"), not being able to
> > > activate "fck" when required.
> > >
> > > Tested on Amstrad Delta.
> > >
> > > Signed-off-by: Janusz Krzysztofik <jkrzyszt@....icnet.pl>
> > > ---
> > >
> > > drivers/base/power/clock_ops.c | 6 +++---
> > > 1 file changed, 3 insertions(+), 3 deletions(-)
> > >
> > > --- git/drivers/base/power/clock_ops.c.orig 2011-05-30
> > > 22:16:35.000000000 +0200 +++
> > > git/drivers/base/power/clock_ops.c 2011-06-05 15:19:55.000000000
> > > +0200 @@ -291,7 +291,7 @@ static int pm_runtime_clk_notify(struct
> > >
> > > {
> > >
> > > struct pm_clk_notifier_block *clknb;
> > > struct device *dev = data;
> > >
> > > - char *con_id;
> > > + char **con_id;
> > >
> > > int error;
> > >
> > > dev_dbg(dev, "%s() %ld\n", __func__, action);
> > >
> > > @@ -309,8 +309,8 @@ static int pm_runtime_clk_notify(struct
> > >
> > > dev->pwr_domain = clknb->pwr_domain;
> > > if (clknb->con_ids[0]) {
> > >
> > > - for (con_id = clknb->con_ids[0]; *con_id; con_id++)
> > > - pm_runtime_clk_add(dev, con_id);
> > > + for (con_id = &clknb->con_ids[0]; *con_id; con_id++)
> > > + pm_runtime_clk_add(dev, *con_id);
> > >
> > > } else {
> > >
> > > pm_runtime_clk_add(dev, NULL);
> > >
> > > }
> >
> > First off, sorry for the breakage. Second, while the patch is
> > correct in the part is covered, it is incomplete (it also should
> > cover the !CONFIG_PM_RUNTIME case. So, I think the appended patch
> > would be better.
>
> That's right, please take it over.
OK, below is an "official" version. Can you please double check if it fixes
the problem for you?
Rafael
---
From: Rafael J. Wysocki <rjw@...k.pl>
Subject: PM / Runtime: Fix loops in pm_runtime_clk_notify()
The loops over connection ID strings in pm_runtime_clk_notify()
should actually iterate over the strings and not over the elements
of the first of them, so make those loops behave as appropriate.
This fixes a regression introduced by commit 600b776eb39a13a28b090
(OMAP1 / PM: Use generic clock manipulation routines for runtime PM).
Reported-by: Janusz Krzysztofik <jkrzyszt@....icnet.pl>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
drivers/base/power/clock_ops.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
Index: linux-2.6/drivers/base/power/clock_ops.c
===================================================================
--- linux-2.6.orig/drivers/base/power/clock_ops.c
+++ linux-2.6/drivers/base/power/clock_ops.c
@@ -291,7 +291,7 @@ static int pm_runtime_clk_notify(struct
{
struct pm_clk_notifier_block *clknb;
struct device *dev = data;
- char *con_id;
+ char **con_id;
int error;
dev_dbg(dev, "%s() %ld\n", __func__, action);
@@ -309,8 +309,8 @@ static int pm_runtime_clk_notify(struct
dev->pwr_domain = clknb->pwr_domain;
if (clknb->con_ids[0]) {
- for (con_id = clknb->con_ids[0]; *con_id; con_id++)
- pm_runtime_clk_add(dev, con_id);
+ for (con_id = clknb->con_ids; *con_id; con_id++)
+ pm_runtime_clk_add(dev, *con_id);
} else {
pm_runtime_clk_add(dev, NULL);
}
@@ -380,7 +380,7 @@ static int pm_runtime_clk_notify(struct
{
struct pm_clk_notifier_block *clknb;
struct device *dev = data;
- char *con_id;
+ char **con_id;
dev_dbg(dev, "%s() %ld\n", __func__, action);
@@ -389,16 +389,16 @@ static int pm_runtime_clk_notify(struct
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
if (clknb->con_ids[0]) {
- for (con_id = clknb->con_ids[0]; *con_id; con_id++)
- enable_clock(dev, con_id);
+ for (con_id = clknb->con_ids; *con_id; con_id++)
+ enable_clock(dev, *con_id);
} else {
enable_clock(dev, NULL);
}
break;
case BUS_NOTIFY_DEL_DEVICE:
if (clknb->con_ids[0]) {
- for (con_id = clknb->con_ids[0]; *con_id; con_id++)
- disable_clock(dev, con_id);
+ for (con_id = clknb->con_ids; *con_id; con_id++)
+ disable_clock(dev, *con_id);
} else {
disable_clock(dev, NULL);
}
--
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