On Thu, 2015-07-02 at 15:40 -0700, Nishanth Aravamudan wrote:
> While we never would successfully load on the wrong machine type, there
> is extra output by default regardless of machine type.
>
> For instance, on a PowerVM LPAR, we see the following:
>
> nx_compress_powernv: loading
> nx_compress_powernv: no coprocessors found
>
> even though those coprocessors could never be found. Similar pseries
> messages are printed on powernv.
I know I've been converting init calls to machine_initcalls() to avoid these
sort of issues in platform code. But for a driver it should be trivial for it
to only probe when the hardware is found.
By which I mean I think we shouldn't need these.
> diff --git a/drivers/crypto/nx/nx-842-powernv.c b/drivers/crypto/nx/nx-842-powernv.c
> index 33b3b0abf4ae..6b5e5143c95b 100644
> --- a/drivers/crypto/nx/nx-842-powernv.c
> +++ b/drivers/crypto/nx/nx-842-powernv.c
> @@ -594,6 +594,9 @@ static __init int nx842_powernv_init(void)
> BUILD_BUG_ON(DDE_BUFFER_ALIGN % DDE_BUFFER_SIZE_MULT);
> BUILD_BUG_ON(DDE_BUFFER_SIZE_MULT % DDE_BUFFER_LAST_MULT);
>
> + if (!machine_is(powernv))
> + return -ENODEV;
> +
> pr_info("loading\n");
This is just too chatty, drop it.
> for_each_compatible_node(dn, NULL, "ibm,power-nx")
It shouldn't be printing anything unless it finds some devices in this loop.
And you should drop the print in here:
if (!nx842_ct) {
pr_err("no coprocessors found\n");
return -ENODEV;
}
And that should mean no output unless hardware is found I think?
> @@ -625,6 +628,9 @@ static void __exit nx842_powernv_exit(void)
> {
> struct nx842_coproc *coproc, *n;
>
> + if (!machine_is(powernv))
> + return;
You shouldn't need to touch the exit paths if the drivers were never loaded?
> diff --git a/drivers/crypto/nx/nx-842-pseries.c b/drivers/crypto/nx/nx-842-pseries.c
> index b84b0ceeb46e..75a7bfdc160e 100644
> --- a/drivers/crypto/nx/nx-842-pseries.c
> +++ b/drivers/crypto/nx/nx-842-pseries.c
> @@ -1091,6 +1091,9 @@ static int __init nx842_pseries_init(void)
> struct nx842_devdata *new_devdata;
> int ret;
>
> + if (!machine_is(pseries))
> + return -ENODEV;
> +
> pr_info("Registering IBM Power 842 compression driver\n");
Again this is too chatty, just remove it.
> if (!of_find_compatible_node(NULL, NULL, "ibm,compression"))
return -ENODEV;
That should do the trick shouldn't it?
cheers
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