diff options
Diffstat (limited to 'target/linux/generic/pending-5.15/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch')
| -rw-r--r-- | target/linux/generic/pending-5.15/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.15/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch b/target/linux/generic/pending-5.15/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch new file mode 100644 index 0000000000..cc489ebc8a --- /dev/null +++ b/target/linux/generic/pending-5.15/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch @@ -0,0 +1,35 @@ +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; |