linux-kernel - [PATCH v3 1/5] PCI: Let pcibios_root_bridge

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Message-Id: <20211207104924.21327-2-sergio.paracuellos@gmail.com>
Date:   Tue,  7 Dec 2021 11:49:20 +0100
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     linux-pci@...r.kernel.org
Cc:     tsbogend@...ha.franken.de, lorenzo.pieralisi@....com,
        bhelgaas@...gle.com, linux@...ck-us.net,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v3 1/5] PCI: Let pcibios_root_bridge_prepare() access to 'bridge->windows'

When function pci_register_host_bridge() is called, 'bridge->windows' are
already available. However this windows are being moved temporarily from
there. To let pcibios_root_bridge_prepare() to have access to this windows
move this windows movement after call this function. This is interesting for
MIPS ralink mt7621 platform to be able to properly set I/O coherence units
with this information and avoid custom MIPS code in generic PCIe controller
drivers.

Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
---
 drivers/pci/probe.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 087d3658f75c..372a70efccc6 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -898,8 +898,6 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
 
 	bridge->bus = bus;
 
-	/* Temporarily move resources off the list */
-	list_splice_init(&bridge->windows, &resources);
 	bus->sysdata = bridge->sysdata;
 	bus->ops = bridge->ops;
 	bus->number = bus->busn_res.start = bridge->busnr;
@@ -925,6 +923,8 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
 	if (err)
 		goto free;
 
+	/* Temporarily move resources off the list */
+	list_splice_init(&bridge->windows, &resources);
 	err = device_add(&bridge->dev);
 	if (err) {
 		put_device(&bridge->dev);
-- 
2.33.0