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ACPI: scan: Use unique number for instance_no

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[ Upstream commit eb50aaf960e3bedfef79063411ffd670da94b84b ]

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: e49bd2dd5a ("ACPI: use PNPID:instance_no as bus_id of ACPI device")
Fixes: ca9dc8d42b ("ACPI / scan: Fix acpi_bus_id_list bookkeeping")
Signed-off-by: Andy Shevchenko <[email protected]>
Cc: 4.10+ <[email protected]> # 4.10+
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Andy Shevchenko 2021-03-22 18:31:00 +02:00 • committed by Greg Kroah-Hartman
commit bc0b1a2036
3 changed files with 34 additions and 6 deletions
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1
include/acpi/acpi_bus.h
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@ -232,6 +232,7 @@ struct acpi_pnp_type {
struct acpi_device_pnp {
acpi_bus_id bus_id; /* Object name */
int instance_no; /* Instance number of this object */
struct acpi_pnp_type type; /* ID type */
acpi_bus_address bus_address; /* _ADR */
char *unique_id; /* _UID */