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* Regulator API ignored return values
@ 2013-03-11 20:43 ` Arnd Bergmann
  0 siblings, 0 replies; 9+ messages in thread
From: Arnd Bergmann @ 2013-03-11 20:43 UTC (permalink / raw)
  To: linux-kernel, Stephen Warren
  Cc: linux-arm-kernel, Mark Brown, Linus Walleij, Chris Ball,
	Axel Lin, Jingoo Han, Felipe Balbi, Dmitry Torokhov

Hi all,

Mark Brown has added a patch to Linux-next that warns about certain regulator
API functions being called without checking the results, which seems to have
uncovered a number of bugs.

I've added a few people to Cc that might be interested in the reports and
in fixing these bugs. Below you can find a list of all instances I found
building the ARM defconfigs.

	Arnd

==> build/dove_defconfig/faillog <==
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/imx_v4_v5_defconfig/faillog <==
/git/arm-soc/drivers/input/touchscreen/ads7846.c: In function '__ads7846_enable':
/git/arm-soc/drivers/input/touchscreen/ads7846.c:239:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/video/backlight/l4f00242t03.c: In function 'l4f00242t03_lcd_init':
/git/arm-soc/drivers/video/backlight/l4f00242t03.c:58:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/video/backlight/l4f00242t03.c:61:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/imx_v6_v7_defconfig/faillog <==
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/video/backlight/l4f00242t03.c: In function 'l4f00242t03_lcd_init':
/git/arm-soc/drivers/video/backlight/l4f00242t03.c:58:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/video/backlight/l4f00242t03.c:61:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/magician_defconfig/faillog <==
/git/arm-soc/drivers/usb/otg/gpio_vbus.c: In function 'set_vbus_draw':
/git/arm-soc/drivers/usb/otg/gpio_vbus.c:72:20: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/mmp2_defconfig/faillog <==
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/omap2plus_defconfig/faillog <==
/git/arm-soc/drivers/input/touchscreen/ads7846.c: In function '__ads7846_enable':
/git/arm-soc/drivers/input/touchscreen/ads7846.c:239:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/tegra_defconfig/faillog <==
/git/arm-soc/arch/arm/mach-tegra/board-harmony-pcie.c: In function 'harmony_pcie_init':
/git/arm-soc/arch/arm/mach-tegra/board-harmony-pcie.c:65:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/u8500_defconfig/faillog <==
/git/arm-soc/arch/arm/mach-ux500/board-mop500.c: In function 'mop500_prox_activate':
/git/arm-soc/arch/arm/mach-ux500/board-mop500.c:432:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/mfd/ab8500-gpadc.c: In function 'ab8500_gpadc_runtime_resume':
/git/arm-soc/drivers/mfd/ab8500-gpadc.c:598:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/mfd/ab8500-gpadc.c: In function 'ab8500_gpadc_probe':
/git/arm-soc/drivers/mfd/ab8500-gpadc.c:655:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/staging/ste_rmi4/synaptics_i2c_rmi4.c: In function 'synaptics_rmi4_resume':
/git/arm-soc/drivers/staging/ste_rmi4/synaptics_i2c_rmi4.c:1085:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

^ permalink raw reply	[flat|nested] 9+ messages in thread
* Regulator API ignored return values
@ 2013-03-11 20:43 ` Arnd Bergmann
  0 siblings, 0 replies; 9+ messages in thread
From: Arnd Bergmann @ 2013-03-11 20:43 UTC (permalink / raw)
  To: linux-arm-kernel

Hi all,

Mark Brown has added a patch to Linux-next that warns about certain regulator
API functions being called without checking the results, which seems to have
uncovered a number of bugs.

I've added a few people to Cc that might be interested in the reports and
in fixing these bugs. Below you can find a list of all instances I found
building the ARM defconfigs.

	Arnd

==> build/dove_defconfig/faillog <==
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/imx_v4_v5_defconfig/faillog <==
/git/arm-soc/drivers/input/touchscreen/ads7846.c: In function '__ads7846_enable':
/git/arm-soc/drivers/input/touchscreen/ads7846.c:239:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/video/backlight/l4f00242t03.c: In function 'l4f00242t03_lcd_init':
/git/arm-soc/drivers/video/backlight/l4f00242t03.c:58:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/video/backlight/l4f00242t03.c:61:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/imx_v6_v7_defconfig/faillog <==
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/video/backlight/l4f00242t03.c: In function 'l4f00242t03_lcd_init':
/git/arm-soc/drivers/video/backlight/l4f00242t03.c:58:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/video/backlight/l4f00242t03.c:61:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/magician_defconfig/faillog <==
/git/arm-soc/drivers/usb/otg/gpio_vbus.c: In function 'set_vbus_draw':
/git/arm-soc/drivers/usb/otg/gpio_vbus.c:72:20: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/mmp2_defconfig/faillog <==
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/omap2plus_defconfig/faillog <==
/git/arm-soc/drivers/input/touchscreen/ads7846.c: In function '__ads7846_enable':
/git/arm-soc/drivers/input/touchscreen/ads7846.c:239:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/tegra_defconfig/faillog <==
/git/arm-soc/arch/arm/mach-tegra/board-harmony-pcie.c: In function 'harmony_pcie_init':
/git/arm-soc/arch/arm/mach-tegra/board-harmony-pcie.c:65:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

==> build/u8500_defconfig/faillog <==
/git/arm-soc/arch/arm/mach-ux500/board-mop500.c: In function 'mop500_prox_activate':
/git/arm-soc/arch/arm/mach-ux500/board-mop500.c:432:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/mfd/ab8500-gpadc.c: In function 'ab8500_gpadc_runtime_resume':
/git/arm-soc/drivers/mfd/ab8500-gpadc.c:598:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/mfd/ab8500-gpadc.c: In function 'ab8500_gpadc_probe':
/git/arm-soc/drivers/mfd/ab8500-gpadc.c:655:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
/git/arm-soc/drivers/staging/ste_rmi4/synaptics_i2c_rmi4.c: In function 'synaptics_rmi4_resume':
/git/arm-soc/drivers/staging/ste_rmi4/synaptics_i2c_rmi4.c:1085:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: Regulator API ignored return values
  2013-03-11 20:43 ` Arnd Bergmann
@ 2013-03-11 20:48   ` Stephen Warren
  -1 siblings, 0 replies; 9+ messages in thread
From: Stephen Warren @ 2013-03-11 20:48 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: linux-kernel, linux-arm-kernel, Mark Brown, Linus Walleij,
	Chris Ball, Axel Lin, Jingoo Han, Felipe Balbi, Dmitry Torokhov

On 03/11/2013 02:43 PM, Arnd Bergmann wrote:
> Hi all,
> 
> Mark Brown has added a patch to Linux-next that warns about certain regulator
> API functions being called without checking the results, which seems to have
> uncovered a number of bugs.
> 
> I've added a few people to Cc that might be interested in the reports and
> in fixing these bugs. Below you can find a list of all instances I found
> building the ARM defconfigs.

> ==> build/tegra_defconfig/faillog <==
> /git/arm-soc/arch/arm/mach-tegra/board-harmony-pcie.c: In function 'harmony_pcie_init':
> /git/arm-soc/arch/arm/mach-tegra/board-harmony-pcie.c:65:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

This one should be fixed by 84b808d "ARM: tegra: fix ignored return
value of regulator_enable" the next time next is rebuilt.

^ permalink raw reply	[flat|nested] 9+ messages in thread
* Regulator API ignored return values
@ 2013-03-11 20:48   ` Stephen Warren
  0 siblings, 0 replies; 9+ messages in thread
From: Stephen Warren @ 2013-03-11 20:48 UTC (permalink / raw)
  To: linux-arm-kernel

On 03/11/2013 02:43 PM, Arnd Bergmann wrote:
> Hi all,
> 
> Mark Brown has added a patch to Linux-next that warns about certain regulator
> API functions being called without checking the results, which seems to have
> uncovered a number of bugs.
> 
> I've added a few people to Cc that might be interested in the reports and
> in fixing these bugs. Below you can find a list of all instances I found
> building the ARM defconfigs.

> ==> build/tegra_defconfig/faillog <==
> /git/arm-soc/arch/arm/mach-tegra/board-harmony-pcie.c: In function 'harmony_pcie_init':
> /git/arm-soc/arch/arm/mach-tegra/board-harmony-pcie.c:65:18: warning: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

This one should be fixed by 84b808d "ARM: tegra: fix ignored return
value of regulator_enable" the next time next is rebuilt.

^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: Regulator API ignored return values
  2013-03-11 20:43 ` Arnd Bergmann
@ 2013-03-11 21:55   ` Chris Ball
  -1 siblings, 0 replies; 9+ messages in thread
From: Chris Ball @ 2013-03-11 21:55 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: linux-kernel, Stephen Warren, linux-arm-kernel, Mark Brown,
	Linus Walleij, Axel Lin, Jingoo Han, Felipe Balbi,
	Dmitry Torokhov, linux-mmc

Hi,

On Mon, Mar 11 2013, Arnd Bergmann wrote:
> ==> build/dove_defconfig/faillog <==
> /git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
> /git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring
> return value of 'regulator_enable', declared with attribute
> warn_unused_result [-Wunused-result]

Thanks, this looks like the right fix to me:


Subject: [PATCH] mmc: sdhci: Don't ignore regulator_enable() return value

Fixes:
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring
return value of 'regulator_enable', declared with attribute
warn_unused_result [-Wunused-result]

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
---
 drivers/mmc/host/sdhci.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 51bbba4..fbf0b93 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2907,12 +2907,17 @@ int sdhci_add_host(struct sdhci_host *host)
 			host->vqmmc = NULL;
 		}
 	} else {
-		regulator_enable(host->vqmmc);
+		ret = regulator_enable(host->vqmmc);
 		if (!regulator_is_supported_voltage(host->vqmmc, 1700000,
 			1950000))
 			caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
 					SDHCI_SUPPORT_SDR50 |
 					SDHCI_SUPPORT_DDR50);
+		if (ret) {
+			pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
+				mmc_hostname(mmc), ret);
+			host->vqmmc = NULL;
+		}
 	}
 
 	if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
-- 
Chris Ball   <cjb@laptop.org>   <http://printf.net/>
One Laptop Per Child

^ permalink raw reply related	[flat|nested] 9+ messages in thread
* Regulator API ignored return values
@ 2013-03-11 21:55   ` Chris Ball
  0 siblings, 0 replies; 9+ messages in thread
From: Chris Ball @ 2013-03-11 21:55 UTC (permalink / raw)
  To: linux-arm-kernel

Hi,

On Mon, Mar 11 2013, Arnd Bergmann wrote:
> ==> build/dove_defconfig/faillog <==
> /git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
> /git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring
> return value of 'regulator_enable', declared with attribute
> warn_unused_result [-Wunused-result]

Thanks, this looks like the right fix to me:


Subject: [PATCH] mmc: sdhci: Don't ignore regulator_enable() return value

Fixes:
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring
return value of 'regulator_enable', declared with attribute
warn_unused_result [-Wunused-result]

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
---
 drivers/mmc/host/sdhci.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 51bbba4..fbf0b93 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2907,12 +2907,17 @@ int sdhci_add_host(struct sdhci_host *host)
 			host->vqmmc = NULL;
 		}
 	} else {
-		regulator_enable(host->vqmmc);
+		ret = regulator_enable(host->vqmmc);
 		if (!regulator_is_supported_voltage(host->vqmmc, 1700000,
 			1950000))
 			caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
 					SDHCI_SUPPORT_SDR50 |
 					SDHCI_SUPPORT_DDR50);
+		if (ret) {
+			pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
+				mmc_hostname(mmc), ret);
+			host->vqmmc = NULL;
+		}
 	}
 
 	if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
-- 
Chris Ball   <cjb@laptop.org>   <http://printf.net/>
One Laptop Per Child

^ permalink raw reply related	[flat|nested] 9+ messages in thread
* Re: Regulator API ignored return values
  2013-03-11 20:43 ` Arnd Bergmann
@ 2013-03-12 18:22   ` Mark Brown
  -1 siblings, 0 replies; 9+ messages in thread
From: Mark Brown @ 2013-03-12 18:22 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: linux-kernel, Stephen Warren, linux-arm-kernel, Linus Walleij,
	Chris Ball, Axel Lin, Jingoo Han, Felipe Balbi, Dmitry Torokhov

[-- Attachment #1: Type: text/plain, Size: 298 bytes --]

On Mon, Mar 11, 2013 at 08:43:53PM +0000, Arnd Bergmann wrote:

> /git/arm-soc/drivers/input/touchscreen/ads7846.c: In function '__ads7846_enable':
> /git/arm-soc/drivers/video/backlight/l4f00242t03.c: In function 'l4f00242t03_lcd_init':

In sent patches for these ones (and a few others) already.

[-- Attachment #2: Digital signature --]
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^ permalink raw reply	[flat|nested] 9+ messages in thread
* Regulator API ignored return values
@ 2013-03-12 18:22   ` Mark Brown
  0 siblings, 0 replies; 9+ messages in thread
From: Mark Brown @ 2013-03-12 18:22 UTC (permalink / raw)
  To: linux-arm-kernel

On Mon, Mar 11, 2013 at 08:43:53PM +0000, Arnd Bergmann wrote:

> /git/arm-soc/drivers/input/touchscreen/ads7846.c: In function '__ads7846_enable':
> /git/arm-soc/drivers/video/backlight/l4f00242t03.c: In function 'l4f00242t03_lcd_init':

In sent patches for these ones (and a few others) already.
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^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: Regulator API ignored return values
@ 2013-03-12  5:11 Jingoo Han
  0 siblings, 0 replies; 9+ messages in thread
From: Jingoo Han @ 2013-03-12  5:11 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: linux-kernel, Stephen Warren, linux-arm-kernel, Mark Brown,
	Linus Walleij, Chris Ball, Axel Lin, Jingoo Han, Felipe Balbi,
	Dmitry Torokhov

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=euc-kr, Size: 1259 bytes --]

On Tuesday, March 12, 2013 5:44 AM, Arnd Bergmann wrote:
> 
> Hi all,
> 
> Mark Brown has added a patch to Linux-next that warns about certain regulator
> API functions being called without checking the results, which seems to have
> uncovered a number of bugs.
> 
> I've added a few people to Cc that might be interested in the reports and
> in fixing these bugs. Below you can find a list of all instances I found
> building the ARM defconfigs.
> 
> 	Arnd
> 
[...]
> /git/arm-soc/drivers/video/backlight/l4f00242t03.c: In function 'l4f00242t03_lcd_init':
> /git/arm-soc/drivers/video/backlight/l4f00242t03.c:58:18: warning: ignoring return value of
> 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]
> /git/arm-soc/drivers/video/backlight/l4f00242t03.c:61:18: warning: ignoring return value of
> 'regulator_enable', declared with attribute warn_unused_result [-Wunused-result]

Hi Arnd Bergmann,

I fixed these warnings and the patch was added to mm-tree.
(http://www.spinics.net/lists/mm-commits/msg95324.html)
Thank you for reporting :)

Best regards,
Jingoo Han
ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2013-03-12 18:22 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-03-11 20:43 Regulator API ignored return values Arnd Bergmann
2013-03-11 20:43 ` Arnd Bergmann
2013-03-11 20:48 ` Stephen Warren
2013-03-11 20:48   ` Stephen Warren
2013-03-11 21:55 ` Chris Ball
2013-03-11 21:55   ` Chris Ball
2013-03-12 18:22 ` Mark Brown
2013-03-12 18:22   ` Mark Brown
2013-03-12  5:11 Jingoo Han

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