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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-11-07 01:41:01 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-11-07 01:41:01 +0100 |
| commit | 6931007cc90ba94b3c2b29179d0a7cde194dabe8 (patch) | |
| tree | f60e1a83e7116eb678de61d511c17e62a45d8f82 /drivers/acpi | |
| parent | 71bba8fafac8975dbb684df4098d2dd6baac1fda (diff) | |
| download | linux-6931007cc90ba94b3c2b29179d0a7cde194dabe8.tar.gz linux-6931007cc90ba94b3c2b29179d0a7cde194dabe8.tar.bz2 linux-6931007cc90ba94b3c2b29179d0a7cde194dabe8.zip | |
ACPI / scan: Start matching drivers after trying scan handlers
ACPI scan handlers should always be attached to struct acpi_device
objects before any ACPI drivers, but there is a window during which
a driver may be attached to a struct acpi_device before checking if
there is a matching scan handler. Namely, that will happen if an
ACPI driver module is loaded during acpi_bus_scan() right after
the first namespace walk is complete and before the given device
is processed by the second namespace walk.
To prevent that from happening, set the match_driver flags of
struct acpi_device objects right before running device_attach()
for them in acpi_bus_device_attach().
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/scan.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index fbdb82e70d10..4d377a22622a 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1677,7 +1677,6 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, void acpi_device_add_finalize(struct acpi_device *device) { - device->flags.match_driver = true; dev_set_uevent_suppress(&device->dev, false); kobject_uevent(&device->dev.kobj, KOBJ_ADD); } @@ -1916,8 +1915,12 @@ static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, return AE_OK; ret = acpi_scan_attach_handler(device); - if (ret) - return ret > 0 ? AE_OK : AE_CTRL_DEPTH; + if (ret < 0) + return AE_CTRL_DEPTH; + + device->flags.match_driver = true; + if (ret > 0) + return AE_OK; ret = device_attach(&device->dev); return ret >= 0 ? AE_OK : AE_CTRL_DEPTH; |