linux-kernel - Re: [PATCH 2/6] hwrng: core: Simplify RNG switching from sysfs

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Message-ID: <20150914072701.GB27591@x1>
Date:	Mon, 14 Sep 2015 08:27:01 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Peter Korsgaard <peter@...sgaard.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, herbert@...dor.apana.org.au,
	linux-crypto@...r.kernel.org, mpm@...enic.com, kernel@...inux.com
Subject: Re: [PATCH 2/6] hwrng: core: Simplify RNG switching from sysfs

On Sun, 13 Sep 2015, Peter Korsgaard wrote:

> >>>>> "Lee" == Lee Jones <lee.jones@...aro.org> writes:
> 
>  > If we attempt to use sysfs to change the current RNG in the usual
>  > way i.e. issuing something like:
> 
>  > `echo 8a8a000.rng > /sys/devices/virtual/misc/hw_random/rng_current`
> 
>  > ... it will fail because the code doesn't currently take the '\n'
>  > into consideration.  Well, now it does.
> 
>  > Signed-off-by: Lee Jones <lee.jones@...aro.org>
>  > ---
>  >  drivers/char/hw_random/core.c | 7 ++++++-
>  >  1 file changed, 6 insertions(+), 1 deletion(-)
> 
>  > diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
>  > index da8faf7..14dc984 100644
>  > --- a/drivers/char/hw_random/core.c
>  > +++ b/drivers/char/hw_random/core.c
>  > @@ -316,6 +316,7 @@ static ssize_t hwrng_attr_current_store(struct device *dev,
>  >  					const char *buf, size_t len)
>  >  {
>  >  	int err;
>  > +	int snip = 0;
>  >  	struct hwrng *rng;
>  
>  >  	err = mutex_lock_interruptible(&rng_mutex);
>  > @@ -323,7 +324,11 @@ static ssize_t hwrng_attr_current_store(struct device *dev,
>  >  		return -ERESTARTSYS;
>  >  	err = -ENODEV;
>  >  	list_for_each_entry(rng, &rng_list, list) {
>  > -		if (strcmp(rng->name, buf) == 0) {
>  > +
>  > +		if (buf[len-1] == '\n')
>  > +			snip = 1; /* Snip one character */
>  > +
> 
> How about using sysfs_streq() instead, which is what is done elsewhere?

Perfect.  This is exactly what I'm trying to do, thanks.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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