| Message ID | 1442497557-9271-2-git-send-email-lee.jones@linaro.org |
|---|---|
| State | New |
| Headers | show |
On 17 September 2015 at 14:45, Lee Jones <lee.jones@linaro.org> wrote: > In April 2009, commit d405640 ("Driver Core: misc: add node name support > for misc devices.") inadvertently changed the device node name from > /dev/hw_random to /dev/hwrng. Since 6 years has passed since the change > it seems unpractical to change it back, as this node name is probably > considered ABI by now. So instead, we'll just change the documentation > to match the current situation. > > NB: It looks like rng-tools have already been updated. > > Signed-off-by: Lee Jones <lee.jones@linaro.org> I see the KConfig change went into a separate patch. That's fine by me: Acked-by: Kieran Bingham <kieranbingham@gmail.com> > --- > Documentation/hw_random.txt | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/Documentation/hw_random.txt b/Documentation/hw_random.txt > index 026e237..fce1634 100644 > --- a/Documentation/hw_random.txt > +++ b/Documentation/hw_random.txt > @@ -3,7 +3,7 @@ Introduction: > The hw_random framework is software that makes use of a > special hardware feature on your CPU or motherboard, > a Random Number Generator (RNG). The software has two parts: > - a core providing the /dev/hw_random character device and its > + a core providing the /dev/hwrng character device and its > sysfs support, plus a hardware-specific driver that plugs > into that core. > > @@ -14,7 +14,7 @@ Introduction: > > http://sourceforge.net/projects/gkernel/ > > - Those tools use /dev/hw_random to fill the kernel entropy pool, > + Those tools use /dev/hwrng to fill the kernel entropy pool, > which is used internally and exported by the /dev/urandom and > /dev/random special files. > > @@ -32,13 +32,13 @@ Theory of operation: > The rng-tools package uses such tests in "rngd", and lets you > run them by hand with a "rngtest" utility. > > - /dev/hw_random is char device major 10, minor 183. > + /dev/hwrng is char device major 10, minor 183. > > CLASS DEVICE. There is a /sys/class/misc/hw_random node with > two unique attributes, "rng_available" and "rng_current". The > "rng_available" attribute lists the hardware-specific drivers > available, while "rng_current" lists the one which is currently > - connected to /dev/hw_random. If your system has more than one > + connected to /dev/hwrng. If your system has more than one > RNG available, you may change the one used by writing a name from > the list in "rng_available" into "rng_current". > > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/hw_random.txt b/Documentation/hw_random.txt index 026e237..fce1634 100644 --- a/Documentation/hw_random.txt +++ b/Documentation/hw_random.txt @@ -3,7 +3,7 @@ Introduction: The hw_random framework is software that makes use of a special hardware feature on your CPU or motherboard, a Random Number Generator (RNG). The software has two parts: - a core providing the /dev/hw_random character device and its + a core providing the /dev/hwrng character device and its sysfs support, plus a hardware-specific driver that plugs into that core. @@ -14,7 +14,7 @@ Introduction: http://sourceforge.net/projects/gkernel/ - Those tools use /dev/hw_random to fill the kernel entropy pool, + Those tools use /dev/hwrng to fill the kernel entropy pool, which is used internally and exported by the /dev/urandom and /dev/random special files. @@ -32,13 +32,13 @@ Theory of operation: The rng-tools package uses such tests in "rngd", and lets you run them by hand with a "rngtest" utility. - /dev/hw_random is char device major 10, minor 183. + /dev/hwrng is char device major 10, minor 183. CLASS DEVICE. There is a /sys/class/misc/hw_random node with two unique attributes, "rng_available" and "rng_current". The "rng_available" attribute lists the hardware-specific drivers available, while "rng_current" lists the one which is currently - connected to /dev/hw_random. If your system has more than one + connected to /dev/hwrng. If your system has more than one RNG available, you may change the one used by writing a name from the list in "rng_available" into "rng_current".
In April 2009, commit d405640 ("Driver Core: misc: add node name support for misc devices.") inadvertently changed the device node name from /dev/hw_random to /dev/hwrng. Since 6 years has passed since the change it seems unpractical to change it back, as this node name is probably considered ABI by now. So instead, we'll just change the documentation to match the current situation. NB: It looks like rng-tools have already been updated. Signed-off-by: Lee Jones <lee.jones@linaro.org> --- Documentation/hw_random.txt | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)