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serdev: Fix serdev_uevent failure on ACPI enumerated serdev-controllers

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ACPI enumerated serdev-controllers do not have an ACPI companion, the ACPI
companion belongs to the serdev-device child of the serdev-controller, not
to the controller itself. This was causing serdev_uevent to always return
-ENODEV when called on a serdev-controller leading to errors like these:

kernel: serial serial0: uevent: failed to send synthetic uevent

being logged. This commit modifies serdev_uevent to directly return 0
when called on an ACPI enumerated serdev-controller fixing this.

Note: I do not think that setting a modalias on a devicetree enumerated
serdev-controller makes sense either. So perhaps the !dev->of_node part of
the check can be dropped too, but I'm not entirely sure that doing this
on devicetree too is correct.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2017-12-25 21:50:45 +01:00 committed by Greg Kroah-Hartman
parent ea507ce3e0
commit 7d09995dcb
1 changed files with 5 additions and 0 deletions
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5
drivers/tty/serdev/core.c
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@ -54,6 +54,11 @@ static int serdev_uevent(struct device *dev, struct kobj_uevent_env *env)
int rc;
/* TODO: platform modalias */
/* ACPI enumerated controllers do not have a modalias */
if (!dev->of_node && dev->type == &serdev_ctrl_type)
return 0;
rc = acpi_device_uevent_modalias(dev, env);
if (rc != -ENODEV)
return rc;