From: Marek Behún <kabel@kernel.org>
Date: Wed, 4 May 2022 16:57:55 +0000 (+0200)
Subject: PCI: aardvark: Update comment about link going down after link-up
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4b4f9f172af402d4d4c01cc63d77d115af637d32;p=linux.git

PCI: aardvark: Update comment about link going down after link-up

commit 92f4ffecc4170ce29e67a1f8d51c168c3de95fb2 upstream.

Update the comment about what happens when link goes down after we have
checked for link-up. If a PIO request is done while link-down, we have
a serious problem.

Link: https://lore.kernel.org/r/20220110015018.26359-23-kabel@kernel.org
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 669663fb982ee..ff45052cf48de 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -998,8 +998,12 @@ static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus,
 		return false;
 
 	/*
-	 * If the link goes down after we check for link-up, nothing bad
-	 * happens but the config access times out.
+	 * If the link goes down after we check for link-up, we have a problem:
+	 * if a PIO request is executed while link-down, the whole controller
+	 * gets stuck in a non-functional state, and even after link comes up
+	 * again, PIO requests won't work anymore, and a reset of the whole PCIe
+	 * controller is needed. Therefore we need to prevent sending PIO
+	 * requests while the link is down.
 	 */
 	if (!pci_is_root_bus(bus) && !advk_pcie_link_up(pcie))
 		return false;