linux-kernel - Re: [PATCH] rqchip/stm32: Remove unneeded call to kfree

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Message-ID: <20190723161902.GA2910@hari-Inspiron-1545>
Date:   Tue, 23 Jul 2019 21:49:02 +0530
From:   Hariprasad Kelam <hariprasad.kelam@...il.com>
To:     Steven Price <steven.price@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] rqchip/stm32: Remove unneeded call to kfree

On Mon, Jul 22, 2019 at 11:26:09AM +0100, Steven Price wrote:
> On 19/07/2019 19:46, Hariprasad Kelam wrote:
> > Memory allocated by devm_ alloc will be freed upon device detachment. So
> > we may not require free memory.
> > 
> > Signed-off-by: Hariprasad Kelam <hariprasad.kelam@...il.com>
> > ---
> >  drivers/irqchip/irq-stm32-exti.c | 2 --
> >  1 file changed, 2 deletions(-)
> > 
> > diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
> > index e00f2fa..46ec0af 100644
> > --- a/drivers/irqchip/irq-stm32-exti.c
> > +++ b/drivers/irqchip/irq-stm32-exti.c
> > @@ -779,8 +779,6 @@ static int __init stm32_exti_init(const struct stm32_exti_drv_data *drv_data,
> >  	irq_domain_remove(domain);
> >  out_unmap:
> >  	iounmap(host_data->base);
> > -	kfree(host_data->chips_data);
> > -	kfree(host_data);
> 
> In the commit this is based on these variables are not allocated using a
> devm_ alloc function:
> 
> $ git show e00f2fa | grep -A12 *stm32_exti_host_init
> > stm32_exti_host_data *stm32_exti_host_init(const struct stm32_exti_drv_data *dd,
> > 					   struct device_node *node)
> > {
> > 	struct stm32_exti_host_data *host_data;
> > 
> > 	host_data = kzalloc(sizeof(*host_data), GFP_KERNEL);
> > 	if (!host_data)
> > 		return NULL;
> > 
> > 	host_data->drv_data = dd;
> > 	host_data->chips_data = kcalloc(dd->bank_nr,
> > 					sizeof(struct stm32_exti_chip_data),
> > 					GFP_KERNEL);
> The function stm32_exti_probe *does* use devm_k?alloc, so perhaps you
> were getting confused with that?
> 
> Steve
>
  Yes thanks  for explanation. Please ignore this patch

  Thanks,
  Hariprasad k
> >  	return ret;
> >  }
> >  
> > 
>