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firmware: arm_ffa: Treat missing FF-A feature on a platform as a probe miss

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When FF-A initialisation is driven from a platform device probe, systems
that do not implement FF-A can return -EOPNOTSUPP from the early transport
or version discovery paths. Driver core treats that as a matched probe
failure and prints:

  |  arm-ffa arm-ffa: probe with driver arm-ffa failed with error -95

That is noisy for a firmware interface that can be absent on otherwise
valid systems. Driver core already treats -ENODEV and -ENXIO as quiet
rejected matches, so translate only the early unsupported discovery cases
to -ENODEV. Keep later setup failures unchanged so real FF-A
initialisation problems are still reported as probe failures.

Reported-by: Nathan Chancellor <nathan@kernel.org>
Closes: https://lore.kernel.org/all/20260523001148.GA1319283@ax162
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20260526103649.5684-1-sudeep.holla@kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>
This commit is contained in:
Sudeep Holla 2026-05-26 11:36:49 +01:00
parent 70492cfce2
commit 18706ea68f
1 changed files with 5 additions and 2 deletions
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7
drivers/firmware/arm_ffa/driver.c
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@ -2109,7 +2109,7 @@ static int ffa_probe(struct platform_device *pdev)
ret = ffa_transport_init(&invoke_ffa_fn);
if (ret)
return ret;
return ret == -EOPNOTSUPP ? -ENODEV : ret;
drv_info = kzalloc_obj(*drv_info);
if (!drv_info)
@ -2117,8 +2117,11 @@ static int ffa_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, drv_info);
ret = ffa_version_check(&drv_info->version);
if (ret)
if (ret) {
if (ret == -EOPNOTSUPP)
ret = -ENODEV;
goto free_drv_info;
}
if (ffa_id_get(&drv_info->vm_id)) {
pr_err("failed to obtain VM id for self\n");