linux-kernel - Re: [PATCH] PM/Hibernate: Refactor and simplify freezer_test

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Message-ID: <4F2D3455.4020505@linux.vnet.ibm.com>
Date:	Sat, 04 Feb 2012 19:06:21 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>
CC:	rjw@...k.pl, pavel@....cz, len.brown@...el.com,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM/Hibernate: Refactor and simplify freezer_test_done

On 02/02/2012 10:47 PM, Tejun Heo wrote:

> On Thu, Feb 02, 2012 at 07:10:19AM +0530, Srivatsa S. Bhat wrote:
>> @@ -251,10 +251,10 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
>>  		error = hibernation_snapshot(data->platform_support);
>>  		if (!error) {
>>  			error = put_user(in_suspend, (int __user *)arg);
>> -			if (!error && !freezer_test_done)
>> -				data->ready = 1;
>>  			if (freezer_test_done)
>>  				freezer_test_done = false;
>> +			else if (!error)
>> +				data->ready = 1;
> 
> Hmmm... how about..
> 
> 	data->ready = !freezer_test_done && !error;
> 	freezer_test_done = false;
> 


That looks even better, thanks!

Here is the updated patch:

From: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH] PM/Hibernate: Refactor and simplify freezer_test_done

The code related to 'freezer_test_done' is needlessly convoluted.
Refactor the code and simplify the implementation.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 kernel/power/hibernate.c |   10 +++++-----
 kernel/power/user.c      |    6 ++----
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index c6dee73..72baaf0 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -629,12 +629,8 @@ int hibernate(void)
 		goto Finish;
 
 	error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
-	if (error)
-		goto Thaw;
-	if (freezer_test_done) {
-		freezer_test_done = false;
+	if (error || freezer_test_done)
 		goto Thaw;
-	}
 
 	if (in_suspend) {
 		unsigned int flags = 0;
@@ -659,6 +655,10 @@ int hibernate(void)
 
  Thaw:
 	thaw_processes();
+
+	/* Don't bother checking whether freezer_test_done is true */
+	freezer_test_done = false;
+
  Finish:
 	free_basic_memory_bitmaps();
 	usermodehelper_enable();
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 7bee91f..33c4329 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -251,10 +251,8 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 		error = hibernation_snapshot(data->platform_support);
 		if (!error) {
 			error = put_user(in_suspend, (int __user *)arg);
-			if (!error && !freezer_test_done)
-				data->ready = 1;
-			if (freezer_test_done)
-				freezer_test_done = false;
+			data->ready = !freezer_test_done && !error;
+			freezer_test_done = false;
 		}
 		break;
 


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