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ACPI: utils: Fix reference counting in for_each_acpi_dev_match()

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Currently it's possible to iterate over the dangling pointer in case the device
suddenly disappears. This may happen becase callers put it at the end of a loop.

Instead, let's move that call inside acpi_dev_get_next_match_dev().

Fixes: 803abec64e ("media: ipu3-cio2: Add cio2-bridge to ipu3-cio2 driver")
Fixes: bf263f64e8 ("media: ACPI / bus: Add acpi_dev_get_next_match_dev() and helper macro")
Fixes: edbd1bc495 ("efi/dev-path-parser: Switch to use for_each_acpi_dev_match()")
Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Daniel Scally <djrscally@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andy Shevchenko 2021-07-12 21:21:21 +03:00 committed by Rafael J. Wysocki
parent 2734d6c1b1
commit 71f6428332
4 changed files with 5 additions and 14 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

7
drivers/acpi/utils.c
View file

@ -860,11 +860,9 @@ EXPORT_SYMBOL(acpi_dev_present);
* Return the next match of ACPI device if another matching device was present
* at the moment of invocation, or NULL otherwise.
*
* FIXME: The function does not tolerate the sudden disappearance of @adev, e.g.
* in the case of a hotplug event. That said, the caller should ensure that
* this will never happen.
*
* The caller is responsible for invoking acpi_dev_put() on the returned device.
* On the other hand the function invokes acpi_dev_put() on the given @adev
* assuming that its reference counter had been increased beforehand.
*
* See additional information in acpi_dev_present() as well.
*/
@ -880,6 +878,7 @@ acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const cha
match.hrv = hrv;
dev = bus_find_device(&acpi_bus_type, start, &match, acpi_dev_match_cb);
acpi_dev_put(adev);
return dev ? to_acpi_device(dev) : NULL;
}
EXPORT_SYMBOL(acpi_dev_get_next_match_dev);

1
drivers/firmware/efi/dev-path-parser.c
View file

@ -34,7 +34,6 @@ static long __init parse_acpi_path(const struct efi_dev_path *node,
break;
if (!adev->pnp.unique_id && node->acpi.uid == 0)
break;
acpi_dev_put(adev);
}
if (!adev)
return -ENODEV;

6
drivers/media/pci/intel/ipu3/cio2-bridge.c
View file

@ -173,10 +173,8 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
int ret;
for_each_acpi_dev_match(adev, cfg->hid, NULL, -1) {
if (!adev->status.enabled) {
acpi_dev_put(adev);
if (!adev->status.enabled)
continue;
}
if (bridge->n_sensors >= CIO2_NUM_PORTS) {
acpi_dev_put(adev);
@ -185,7 +183,6 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
}
sensor = &bridge->sensors[bridge->n_sensors];
sensor->adev = adev;
strscpy(sensor->name, cfg->hid, sizeof(sensor->name));
ret = cio2_bridge_read_acpi_buffer(adev, "SSDB",
@ -215,6 +212,7 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
goto err_free_swnodes;
}
sensor->adev = acpi_dev_get(adev);
adev->fwnode.secondary = fwnode;
dev_info(&cio2->dev, "Found supported sensor %s\n",

5
include/acpi/acpi_bus.h
View file

@ -707,11 +707,6 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv);
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV
*
* The caller is responsible for invoking acpi_dev_put() on the returned device.
*
* FIXME: Due to above requirement there is a window that may invalidate @adev
* and next iteration will use a dangling pointer, e.g. in the case of a
* hotplug event. That said, the caller should ensure that this will never
* happen.
*/
#define for_each_acpi_dev_match(adev, hid, uid, hrv) \
for (adev = acpi_dev_get_first_match_dev(hid, uid, hrv); \