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| author | Heiner Kallweit <hkallweit1@gmail.com> | 2023-10-11 10:46:45 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2023-10-25 00:50:30 +0300 |
| commit | 8e37372ad0bea4c9b4712d9943f6ae96cff9491f (patch) | |
| tree | 6cf0a0128ab1f94963def5eba6d1a887ebdb8c78 /drivers/pci | |
| parent | 3cb4f534bac010258b2688395c2f13459a932be9 (diff) | |
| download | linux-8e37372ad0bea4c9b4712d9943f6ae96cff9491f.tar.xz | |
PCI/ASPM: Fix L1 substate handling in aspm_attr_store_common()
aspm_attr_store_common(), which handles sysfs control of ASPM, has the same
problem as fb097dcd5a28 ("PCI/ASPM: Disable only ASPM_STATE_L1 when driver
disables L1"): disabling L1 adds only ASPM_L1 (but not any of the L1.x
substates) to the "aspm_disable" mask.
Enabling one substate, e.g., L1.1, via sysfs removes ASPM_L1 from the
disable mask. Since disabling L1 via sysfs doesn't add any of the
substates to the disable mask, enabling L1.1 actually enables *all* the
substates.
In this scenario:
- Write 0 to "l1_aspm" to disable L1
- Write 1 to "l1_1_aspm" to enable L1.1
the intention is to disable L1 and all L1.x substates, then enable just
L1.1, but in fact, *all* L1.x substates are enabled.
Fix this by explicitly disabling all the L1.x substates when disabling L1.
Fixes: 72ea91afbfb0 ("PCI/ASPM: Add sysfs attributes for controlling ASPM link states")
Link: https://lore.kernel.org/r/6ba7dd79-9cfe-4ed0-a002-d99cb842f361@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index dc203b8e5a63..99656d669f00 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -1255,6 +1255,8 @@ static ssize_t aspm_attr_store_common(struct device *dev, link->aspm_disable &= ~ASPM_STATE_L1; } else { link->aspm_disable |= state; + if (state & ASPM_STATE_L1) + link->aspm_disable |= ASPM_STATE_L1SS; } pcie_config_aspm_link(link, policy_to_aspm_state(link)); |