linux-kernel - [RFC PATCH v1 1/2] PCI/ASPM: Never enable ASPM for insane devices

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Date:   Sat,  6 Nov 2021 18:56:20 +0100
From:   "Saheed O. Bolarinwa" <refactormyself@...il.com>
To:     helgaas@...nel.org
Cc:     "Saheed O. Bolarinwa" <refactormyself@...il.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v1 1/2] PCI/ASPM: Never enable ASPM for insane devices

aspm_attr_store_common() makes it possible to clear the disable bits
even for devices that fails pcie_aspm_sanity_check().

 - Extend the if condition in aspm_attr_store_common() to screen out
   insane devices.

Signed-off-by: Saheed O. Bolarinwa <refactormyself@...il.com>
---
 drivers/pci/pcie/aspm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 013a47f587ce..72cb17489e88 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1225,7 +1225,7 @@ static ssize_t aspm_attr_store_common(struct device *dev,
 	down_read(&pci_bus_sem);
 	mutex_lock(&aspm_lock);
 
-	if (state_enable) {
+	if (state_enable && !pcie_aspm_sanity_check(pdev)) {
 		link->aspm_disable &= ~state;
 		/* need to enable L1 for substates */
 		if (state & ASPM_STATE_L1SS)
-- 
2.20.1