Re: [PATCH 3.0-rc1] PM / runtime: fix broken iteration over clock ids

[Rafael J. Wysocki]

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@xxxxxxxxxxxx>
> ---
>  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.

Thanks,
Rafael

---
 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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