Hello Uwe,
On 2024-06-22 00:16, Uwe Kleine-König wrote:
On 6/21/24 20:13, Dragan Simic wrote:
On 2024-06-21 11:57, Krzysztof Kozlowski wrote:
On 21/06/2024 03:25, Daniel Golle wrote:
From: Aurelien Jarno <aurelien@xxxxxxxxxxx>
[snip]
+ pm_runtime_set_autosuspend_delay(dev,
RK_RNG_AUTOSUSPEND_DELAY);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_enable(dev);
+
+ ret = devm_hwrng_register(dev, &rk_rng->rng);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret, "Failed to register
Rockchip hwrng\n");
+
+ dev_info(&pdev->dev, "Registered Rockchip hwrng\n");
Drop, driver should be silent on success.
I respectfully disagree. Many drivers print a single line upon
successful probing, which I find very useful. In this particular
case, it's even more useful, because some people may be concerned
about the use of hardware TRNGs, so we should actually make sure
to announce it.
I agree to Krzysztof here. From the POV of a driver author, your own
driver is very important and while you write it, it really interests
*you* if the driver is successfully probed. However from a system
perspective these are annoying: There are easily >50 devices[1] on a
system, if all of these print a message in probe, you have little
chance
to see the relevant messages. Even if every driver author thinks their
work is a special snow flake that is worth announcing, in practice
users
only care about your driver if there is a problem. Additionally each
message takes time and so delays the boot process. Additionally each
message takes place in the printk ring buffer and so edges out earlier
messages that might be more important.
Well, I don't find those messages annoying, for the drivers I've had
nothing to do with. Also, in my experience, 99.9% of users don't care
about the kernel messages at all, be it everything hunky-dory, or be
it something really wrong somewhere.
So +1 for dropping the dev_info() or at least using dev_debug() for it.
Best regards
Uwe
[1] On my laptop if have:
$ find /sys/devices -name driver | wc -l
87
On a Raspberrypi it yields 66.
