Messages in this thread | | | Subject | Re: [PATCH 24/25] leds: convert Heartbeat LED trigger driver to devm_kzalloc() | From | Shuah Khan <> | Date | Thu, 05 Jul 2012 10:46:54 -0600 |
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On Wed, 2012-07-04 at 13:10 +0800, Bryan Wu wrote: > Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp> > Signed-off-by: Bryan Wu <bryan.wu@canonical.com> > --- > drivers/leds/ledtrig-heartbeat.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/leds/ledtrig-heartbeat.c b/drivers/leds/ledtrig-heartbeat.c > index d3039f2..5caa01b 100644 > --- a/drivers/leds/ledtrig-heartbeat.c > +++ b/drivers/leds/ledtrig-heartbeat.c > @@ -75,7 +75,8 @@ static void heartbeat_trig_activate(struct led_classdev *led_cdev) > { > struct heartbeat_trig_data *heartbeat_data; > > - heartbeat_data = kzalloc(sizeof(*heartbeat_data), GFP_KERNEL); > + heartbeat_data = devm_kzalloc(led_cdev->dev, sizeof(*heartbeat_data), > + GFP_KERNEL); > if (!heartbeat_data) > return; > > @@ -93,7 +94,6 @@ static void heartbeat_trig_deactivate(struct led_classdev *led_cdev) > > if (led_cdev->activated) { > del_timer_sync(&heartbeat_data->timer); > - kfree(heartbeat_data); > led_cdev->activated = false; > } > } Bryan, Bryan,
I don't believe memory triggers allocate in their activate routine should be converted to devm_kzalloc(). Based on my understanding, the memory allocated using devm_kzalloc() us free'ed when driver is detached. In the case of led triggers, driver stays registered while the triggers it supports can be activated and deactivated many times. By converting these allocations into devm_kzalloc()s could lead to memory leaks. Please correct me if my understanding is incorrect.
If what I am saying makes sense, please take this as comment that is applicable to all led triggers, not just this one.
Thanks, -- Shuah
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