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authorLinus Torvalds <torvalds@linux-foundation.org>2021-07-23 11:08:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-23 11:08:06 -0700
commitec6badfbe1cde0eb2bec4a0b8f6e738171156b5b (patch)
tree9acd59d1763e4dbb0c92dcc860f786aef1792fc5
parent1d597682d3e669ec7021aa33d088ed3d136a5149 (diff)
parent0b8a53a8444c267114f6b5a85d21153ddea190eb (diff)
Merge tag 'acpi-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI fixes from Rafael Wysocki: "These fix a recently broken Kconfig dependency and ACPI device reference counting in an iterator macro. Specifics: - Fix recently broken Kconfig dependency for the ACPI table override via built-in initrd (Robert Richter) - Fix ACPI device reference counting in the for_each_acpi_dev_match() helper macro to avoid use-after-free (Andy Shevchenko)" * tag 'acpi-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI: utils: Fix reference counting in for_each_acpi_dev_match() ACPI: Kconfig: Fix table override from built-in initrd
-rw-r--r--drivers/acpi/Kconfig2
-rw-r--r--drivers/acpi/utils.c7
-rw-r--r--drivers/firmware/efi/dev-path-parser.c1
-rw-r--r--drivers/media/pci/intel/ipu3/cio2-bridge.c6
-rw-r--r--include/acpi/acpi_bus.h5
5 files changed, 6 insertions, 15 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 9d872ea477a6..8f9940f40baa 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -370,7 +370,7 @@ config ACPI_TABLE_UPGRADE
config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD
bool "Override ACPI tables from built-in initrd"
depends on ACPI_TABLE_UPGRADE
- depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION=""
+ depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION_NONE
help
This option provides functionality to override arbitrary ACPI tables
from built-in uncompressed initrd.
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index e7ddd281afff..d5cedffeeff9 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -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);
diff --git a/drivers/firmware/efi/dev-path-parser.c b/drivers/firmware/efi/dev-path-parser.c
index 10d4457417a4..eb9c65f97841 100644
--- a/drivers/firmware/efi/dev-path-parser.c
+++ b/drivers/firmware/efi/dev-path-parser.c
@@ -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;
diff --git a/drivers/media/pci/intel/ipu3/cio2-bridge.c b/drivers/media/pci/intel/ipu3/cio2-bridge.c
index 4657e99df033..59a36f922675 100644
--- a/drivers/media/pci/intel/ipu3/cio2-bridge.c
+++ b/drivers/media/pci/intel/ipu3/cio2-bridge.c
@@ -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",
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 1ae993fee4a5..b9d434a93632 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -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); \