diff options
Diffstat (limited to 'target/linux/mvebu/patches-5.4/024-PCI-aardvark-Don-t-touch-PCIe-registers-if-no-card-c.patch')
| -rw-r--r-- | target/linux/mvebu/patches-5.4/024-PCI-aardvark-Don-t-touch-PCIe-registers-if-no-card-c.patch | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/target/linux/mvebu/patches-5.4/024-PCI-aardvark-Don-t-touch-PCIe-registers-if-no-card-c.patch b/target/linux/mvebu/patches-5.4/024-PCI-aardvark-Don-t-touch-PCIe-registers-if-no-card-c.patch deleted file mode 100644 index f38b6b56bb..0000000000 --- a/target/linux/mvebu/patches-5.4/024-PCI-aardvark-Don-t-touch-PCIe-registers-if-no-card-c.patch +++ /dev/null @@ -1,50 +0,0 @@ -From 70e380250c3621c55ff218cbaf2272830d9dbb1d Mon Sep 17 00:00:00 2001 -From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org> -Date: Thu, 2 Jul 2020 10:30:36 +0200 -Subject: [PATCH] PCI: aardvark: Don't touch PCIe registers if no card - connected -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -When there is no PCIe card connected and advk_pcie_rd_conf() or -advk_pcie_wr_conf() is called for PCI bus which doesn't belong to emulated -root bridge, the aardvark driver throws the following error message: - - advk-pcie d0070000.pcie: config read/write timed out - -Obviously accessing PCIe registers of disconnected card is not possible. - -Extend check in advk_pcie_valid_device() function for validating -availability of PCIe bus. If PCIe link is down, then the device is marked -as Not Found and the driver does not try to access these registers. - -This is just an optimization to prevent accessing PCIe registers when card -is disconnected. Trying to access PCIe registers of disconnected card does -not cause any crash, kernel just needs to wait for a timeout. So if card -disappear immediately after checking for PCIe link (before accessing PCIe -registers), it does not cause any problems. - -Link: https://lore.kernel.org/r/20200702083036.12230-1-pali@kernel.org -Signed-off-by: Pali Rohár <pali@kernel.org> -Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> ---- - drivers/pci/controller/pci-aardvark.c | 7 +++++++ - 1 file changed, 7 insertions(+) - ---- a/drivers/pci/controller/pci-aardvark.c -+++ b/drivers/pci/controller/pci-aardvark.c -@@ -725,6 +725,13 @@ static bool advk_pcie_valid_device(struc - if ((bus->number == pcie->root_bus_nr) && PCI_SLOT(devfn) != 0) - return false; - -+ /* -+ * If the link goes down after we check for link-up, nothing bad -+ * happens but the config access times out. -+ */ -+ if (bus->number != pcie->root_bus_nr && !advk_pcie_link_up(pcie)) -+ return false; -+ - return true; - } - |