openwrt/target/linux/generic/pending-5.15/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch
Ansuel Smith 9a038e7fd1 generic: 5.15: copy config and patch from 5.10
Copy config and patches from kernel 5.10 to kernel 5.15

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
2022-03-27 00:07:34 +00:00

36 lines
1.4 KiB
Diff

From bafda858364003a70b9cda84282f9761587f8033 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
Date: Mon, 10 Jan 2022 00:47:38 +0100
Subject: [PATCH] PCI: aardvark: Update comment about link going down after
link-up
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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.
Signed-off-by: Marek Behún <kabel@kernel.org>
---
drivers/pci/controller/pci-aardvark.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1005,8 +1005,12 @@ static bool advk_pcie_valid_device(struc
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;