linux-kernel - Re: [PATCH] crypto: omap-des - handle error of pm_runtime_get

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Date:	Tue, 15 Apr 2014 10:50:31 -0500
From:	Felipe Balbi <balbi@...com>
To:	Nishanth Menon <nm@...com>
CC:	Joel Fernandes <joelf@...com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, Joachim Eastwood <manabian@...il.com>
Subject: Re: [PATCH] crypto: omap-des - handle error of pm_runtime_get_sync

Hi,

On Tue, Apr 15, 2014 at 10:33:02AM -0500, Nishanth Menon wrote:
> pm_runtime_get_sync may not always succeed depending on SoC involved. So
> handle the error appropriately.
> 
> Reported-by: Joachim Eastwood <manabian@...il.com>
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
> 
> based on v3.15-rc1
> 
> Report-thread: http://marc.info/?t=139750330400002&r=1&w=2
> 
> omap2plus_defconfig + CONFIG_CRYPTO_DEV_OMAP_DES=y
> 
> pandaboard-es-before: http://slexy.org/raw/s21rGPFnKl
> pandaboard-es-after:  http://slexy.org/raw/s2A4UFQVna
> 
>  drivers/crypto/omap-des.c |   18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
> index ec5f131..c2d362f 100644
> --- a/drivers/crypto/omap-des.c
> +++ b/drivers/crypto/omap-des.c
> @@ -223,12 +223,18 @@ static void omap_des_write_n(struct omap_des_dev *dd, u32 offset,
>  
>  static int omap_des_hw_init(struct omap_des_dev *dd)
>  {
> +	int err;
> +
>  	/*
>  	 * clocks are enabled when request starts and disabled when finished.
>  	 * It may be long delays between requests.
>  	 * Device might go to off mode to save power.
>  	 */
> -	pm_runtime_get_sync(dd->dev);
> +	err = pm_runtime_get_sync(dd->dev);
> +	if (err < 0) {
> +		dev_err(dd->dev, "failed to get_sync(%d)\n", err);
> +		return err;

even when get() fails, you must put().

> +	}
>  
>  	if (!(dd->flags & FLAGS_INIT)) {
>  		dd->flags |= FLAGS_INIT;
> @@ -1083,7 +1089,11 @@ static int omap_des_probe(struct platform_device *pdev)
>  	dd->phys_base = res->start;
>  
>  	pm_runtime_enable(dev);
> -	pm_runtime_get_sync(dev);
> +	err = pm_runtime_get_sync(dev);
> +	if (err < 0) {
> +		dev_err(dd->dev, "failed to get_sync(%d)\n", err);
> +		goto err_get;

this leaves usage_count incremented, needs a put() here too.

-- 
balbi

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