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Date: Thu, 30 Mar 2017 18:12:03 -0700
From: Brian Norris <briannorris@...omium.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
Richard Zhu <hongxing.zhu@....com>,
Lucas Stach <l.stach@...gutronix.de>,
Minghuan Lian <minghuan.Lian@...escale.com>,
Mingkai Hu <mingkai.hu@...escale.com>,
Roy Zang <tie-fei.zang@...escale.com>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
Niklas Cassel <niklas.cassel@...s.com>,
Jesper Nilsson <jesper.nilsson@...s.com>,
Jingoo Han <jingoohan1@...il.com>,
Joao Pinto <Joao.Pinto@...opsys.com>,
Zhou Wang <wangzhou1@...ilicon.com>,
Gabriele Paoloni <gabriele.paoloni@...wei.com>,
Pratyush Anand <pratyush.anand@...il.com>,
Will Deacon <will.deacon@....com>,
David Daney <david.daney@...ium.com>,
Rob Herring <robh@...nel.org>,
Tanmay Inamdar <tinamdar@....com>,
Brian Norris <briannorris@...omium.org>
Subject: [PATCH] PCI: don't allow unbinding host controllers that aren't prepared
Many PCI host controller drivers aren't prepared to have their devices
unbound from them forcefully (e.g., through /sys/.../<driver>/unbind),
as they don't provide any driver .remove callback, where they'd detach
the root bus, release resources, etc. Keeping the driver built in (i.e.,
not a loadable module) is not enough; and providing no .remove callback
just means we don't do any teardown.
To rule out the possibility of unbinding a device via sysfs, we need to
set the ".suppress_bind_attrs" field.
I found the suspect drivers via the following search:
git grep -l platform_driver $(git grep -L -e '\.remove' -e suppress_bind_attrs drivers/pci/)
Then I inspected them to ensure that
(a) they set up a PCI bus in their probe() and
(b) they don't have a remove() callback for undoing the setup
I excluded drivers/pci/host/pcie-rockchip.c, because I've implemented
remove() support elsewhere [1].
[1] https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1349576.html
[PATCH v2 3/5] PCI: rockchip: add remove() support
Suggested-by: Bjorn Helgaas <helgaas@...nel.org>
Signed-off-by: Brian Norris <briannorris@...omium.org>
---
Not tested, other than to compile a few of these.
drivers/pci/dwc/pci-imx6.c | 1 +
drivers/pci/dwc/pci-layerscape.c | 1 +
drivers/pci/dwc/pcie-armada8k.c | 1 +
drivers/pci/dwc/pcie-artpec6.c | 1 +
drivers/pci/dwc/pcie-designware-plat.c | 1 +
drivers/pci/dwc/pcie-hisi.c | 2 ++
drivers/pci/dwc/pcie-spear13xx.c | 1 +
drivers/pci/host/pci-ftpci100.c | 1 +
drivers/pci/host/pci-host-generic.c | 1 +
drivers/pci/host/pci-thunder-ecam.c | 1 +
drivers/pci/host/pci-thunder-pem.c | 1 +
drivers/pci/host/pci-versatile.c | 1 +
drivers/pci/host/pci-xgene.c | 1 +
13 files changed, 14 insertions(+)
diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c
index 801e46cd266d..f85a063e9964 100644
--- a/drivers/pci/dwc/pci-imx6.c
+++ b/drivers/pci/dwc/pci-imx6.c
@@ -725,6 +725,7 @@ static struct platform_driver imx6_pcie_driver = {
.driver = {
.name = "imx6q-pcie",
.of_match_table = imx6_pcie_of_match,
+ .suppress_bind_attrs = true,
},
.shutdown = imx6_pcie_shutdown,
};
diff --git a/drivers/pci/dwc/pci-layerscape.c b/drivers/pci/dwc/pci-layerscape.c
index c32e392a0ae6..880f345bff43 100644
--- a/drivers/pci/dwc/pci-layerscape.c
+++ b/drivers/pci/dwc/pci-layerscape.c
@@ -305,6 +305,7 @@ static struct platform_driver ls_pcie_driver = {
.driver = {
.name = "layerscape-pcie",
.of_match_table = ls_pcie_of_match,
+ .suppress_bind_attrs = true,
},
};
builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);
diff --git a/drivers/pci/dwc/pcie-armada8k.c b/drivers/pci/dwc/pcie-armada8k.c
index f110e3b24a26..9d8f7e4db5df 100644
--- a/drivers/pci/dwc/pcie-armada8k.c
+++ b/drivers/pci/dwc/pcie-armada8k.c
@@ -262,6 +262,7 @@ static struct platform_driver armada8k_pcie_driver = {
.driver = {
.name = "armada8k-pcie",
.of_match_table = of_match_ptr(armada8k_pcie_of_match),
+ .suppress_bind_attrs = true,
},
};
builtin_platform_driver(armada8k_pcie_driver);
diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
index fcd3ef845883..7a86d4b4dcc1 100644
--- a/drivers/pci/dwc/pcie-artpec6.c
+++ b/drivers/pci/dwc/pcie-artpec6.c
@@ -290,6 +290,7 @@ static struct platform_driver artpec6_pcie_driver = {
.driver = {
.name = "artpec6-pcie",
.of_match_table = artpec6_pcie_of_match,
+ .suppress_bind_attrs = true,
},
};
builtin_platform_driver(artpec6_pcie_driver);
diff --git a/drivers/pci/dwc/pcie-designware-plat.c b/drivers/pci/dwc/pcie-designware-plat.c
index b6c832ba39dd..bdb75a5758ae 100644
--- a/drivers/pci/dwc/pcie-designware-plat.c
+++ b/drivers/pci/dwc/pcie-designware-plat.c
@@ -129,6 +129,7 @@ static struct platform_driver dw_plat_pcie_driver = {
.driver = {
.name = "dw-pcie",
.of_match_table = dw_plat_pcie_of_match,
+ .suppress_bind_attrs = true,
},
.probe = dw_plat_pcie_probe,
};
diff --git a/drivers/pci/dwc/pcie-hisi.c b/drivers/pci/dwc/pcie-hisi.c
index fd66a3199db7..088ed5e4e46b 100644
--- a/drivers/pci/dwc/pcie-hisi.c
+++ b/drivers/pci/dwc/pcie-hisi.c
@@ -334,6 +334,7 @@ static struct platform_driver hisi_pcie_driver = {
.driver = {
.name = "hisi-pcie",
.of_match_table = hisi_pcie_of_match,
+ .suppress_bind_attrs = true,
},
};
builtin_platform_driver(hisi_pcie_driver);
@@ -391,6 +392,7 @@ static struct platform_driver hisi_pcie_almost_ecam_driver = {
.driver = {
.name = "hisi-pcie-almost-ecam",
.of_match_table = hisi_pcie_almost_ecam_of_match,
+ .suppress_bind_attrs = true,
},
};
builtin_platform_driver(hisi_pcie_almost_ecam_driver);
diff --git a/drivers/pci/dwc/pcie-spear13xx.c b/drivers/pci/dwc/pcie-spear13xx.c
index eaa4ea8e2ea4..0d117499da0d 100644
--- a/drivers/pci/dwc/pcie-spear13xx.c
+++ b/drivers/pci/dwc/pcie-spear13xx.c
@@ -308,6 +308,7 @@ static struct platform_driver spear13xx_pcie_driver = {
.driver = {
.name = "spear-pcie",
.of_match_table = of_match_ptr(spear13xx_pcie_of_match),
+ .suppress_bind_attrs = true,
},
};
diff --git a/drivers/pci/host/pci-ftpci100.c b/drivers/pci/host/pci-ftpci100.c
index 4ae5418a1aad..9d2713707a91 100644
--- a/drivers/pci/host/pci-ftpci100.c
+++ b/drivers/pci/host/pci-ftpci100.c
@@ -556,6 +556,7 @@ static struct platform_driver faraday_pci_driver = {
.driver = {
.name = "ftpci100",
.of_match_table = of_match_ptr(faraday_pci_of_match),
+ .suppress_bind_attrs = true,
},
.probe = faraday_pci_probe,
};
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index c05ea9d72f69..7d709a7e0aa8 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -60,6 +60,7 @@ static struct platform_driver gen_pci_driver = {
.driver = {
.name = "pci-host-generic",
.of_match_table = gen_pci_of_match,
+ .suppress_bind_attrs = true,
},
.probe = gen_pci_probe,
};
diff --git a/drivers/pci/host/pci-thunder-ecam.c b/drivers/pci/host/pci-thunder-ecam.c
index 3f54a43bbbea..fc0ca03f280e 100644
--- a/drivers/pci/host/pci-thunder-ecam.c
+++ b/drivers/pci/host/pci-thunder-ecam.c
@@ -373,6 +373,7 @@ static struct platform_driver thunder_ecam_driver = {
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = thunder_ecam_of_match,
+ .suppress_bind_attrs = true,
},
.probe = thunder_ecam_probe,
};
diff --git a/drivers/pci/host/pci-thunder-pem.c b/drivers/pci/host/pci-thunder-pem.c
index 52b5bdccf5f0..4260b0765949 100644
--- a/drivers/pci/host/pci-thunder-pem.c
+++ b/drivers/pci/host/pci-thunder-pem.c
@@ -416,6 +416,7 @@ static struct platform_driver thunder_pem_driver = {
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = thunder_pem_of_match,
+ .suppress_bind_attrs = true,
},
.probe = thunder_pem_probe,
};
diff --git a/drivers/pci/host/pci-versatile.c b/drivers/pci/host/pci-versatile.c
index 5ebee7d37ff5..5a5b84227eb6 100644
--- a/drivers/pci/host/pci-versatile.c
+++ b/drivers/pci/host/pci-versatile.c
@@ -221,6 +221,7 @@ static struct platform_driver versatile_pci_driver = {
.driver = {
.name = "versatile-pci",
.of_match_table = versatile_pci_of_match,
+ .suppress_bind_attrs = true,
},
.probe = versatile_pci_probe,
};
diff --git a/drivers/pci/host/pci-xgene.c b/drivers/pci/host/pci-xgene.c
index 1a6108788f6f..517bea33809f 100644
--- a/drivers/pci/host/pci-xgene.c
+++ b/drivers/pci/host/pci-xgene.c
@@ -697,6 +697,7 @@ static struct platform_driver xgene_pcie_driver = {
.driver = {
.name = "xgene-pcie",
.of_match_table = of_match_ptr(xgene_pcie_match_table),
+ .suppress_bind_attrs = true,
},
.probe = xgene_pcie_probe_bridge,
};
--
2.12.2.564.g063fe858b8-goog
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