ACPI: scan: Use unique number for instance_no
authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Mon, 22 Mar 2021 16:31:00 +0000 (18:31 +0200)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Mon, 22 Mar 2021 16:45:53 +0000 (17:45 +0100)
commiteb50aaf960e3bedfef79063411ffd670da94b84b
tree50d4df51a5033cfb2832c29ebb7c342ffce85190
parent0d02ec6b3136c73c09e7859f0d0e4e2c4c07b49b
ACPI: scan: Use unique number for instance_no

The decrementation of acpi_device_bus_id->instance_no
in acpi_device_del() is incorrect, because it may cause
a duplicate instance number to be allocated next time
a device with the same acpi_device_bus_id is added.

Replace above mentioned approach by using IDA framework.

While at it, define the instance range to be [0, 4096).

Fixes: e49bd2dd5a50 ("ACPI: use PNPID:instance_no as bus_id of ACPI device")
Fixes: ca9dc8d42b30 ("ACPI / scan: Fix acpi_bus_id_list bookkeeping")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: 4.10+ <stable@vger.kernel.org> # 4.10+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/acpi/internal.h
drivers/acpi/scan.c
include/acpi/acpi_bus.h