diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-08-26 01:29:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-17 09:22:09 -0700 |
| commit | afdd3bcc760e02740b2a375a0ad6447e3da3959f (patch) | |
| tree | 14cc2a9f3d5248f7666bd2695edc9522a95383ce /drivers | |
| parent | baf705af97bd84b867de7e16016b3be8cfd99b9a (diff) | |
ACPI / scan: Allow ACPI drivers to bind to PNP device objects
commit fc2e0a8326d1b21d11ef8213298e5302867fed2c upstream.
We generally don't allow ACPI drivers to bind to ACPI device objects
that companion "physical" device objects are created for to avoid
situations in which two different drivers may attempt to handle one
device at the same time. Recent ACPI device enumeration rework
extended that approach to ACPI PNP devices by starting to use a scan
handler for enumerating them. However, we previously allowed ACPI
drivers to bind to ACPI device objects with existing PNP device
companions and changing that led to functional regressions on some
systems.
For this reason, add a special check for PNP devices in
acpi_device_probe() so that ACPI drivers can bind to ACPI device
objects having existing PNP device companions as before.
Fixes: eec15edbb0e1 (ACPI / PNP: use device ID list for PNPACPI device enumeration)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=81511
Link: https://bugzilla.kernel.org/show_bug.cgi?id=81971
Reported-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Reported-by: Dirk Griesbach <spamthis@freenet.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/scan.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index c4f4432ab5b1..9d60cfd7f2d8 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -978,7 +978,7 @@ static int acpi_device_probe(struct device *dev) struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); int ret; - if (acpi_dev->handler) + if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) return -EINVAL; if (!acpi_drv->ops.add) |