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Message-ID: <f990c627-32f5-af84-0409-088ea0f4399d@cogentembedded.com>
Date: Thu, 23 Aug 2018 23:11:54 +0300
From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 4.9.y] PCI: OF: Fix I/O space page leak
Commit a5fb9fb023a1435f2b42bccd7f547560f3a21dc3 upstream.
When testing the R-Car PCIe driver on the Condor board, if the PCIe PHY
driver was left disabled, the kernel crashed with this BUG:
kernel BUG at lib/ioremap.c:72!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 39 Comm: kworker/0:1 Not tainted 4.17.0-dirty #1092
Hardware name: Renesas Condor board based on r8a77980 (DT)
Workqueue: events deferred_probe_work_func
pstate: 80000005 (Nzcv daif -PAN -UAO)
pc : ioremap_page_range+0x370/0x3c8
lr : ioremap_page_range+0x40/0x3c8
sp : ffff000008da39e0
x29: ffff000008da39e0 x28: 00e8000000000f07
x27: ffff7dfffee00000 x26: 0140000000000000
x25: ffff7dfffef00000 x24: 00000000000fe100
x23: ffff80007b906000 x22: ffff000008ab8000
x21: ffff000008bb1d58 x20: ffff7dfffef00000
x19: ffff800009c30fb8 x18: 0000000000000001
x17: 00000000000152d0 x16: 00000000014012d0
x15: 0000000000000000 x14: 0720072007200720
x13: 0720072007200720 x12: 0720072007200720
x11: 0720072007300730 x10: 00000000000000ae
x9 : 0000000000000000 x8 : ffff7dffff000000
x7 : 0000000000000000 x6 : 0000000000000100
x5 : 0000000000000000 x4 : 000000007b906000
x3 : ffff80007c61a880 x2 : ffff7dfffeefffff
x1 : 0000000040000000 x0 : 00e80000fe100f07
Process kworker/0:1 (pid: 39, stack limit = 0x (ptrval))
Call trace:
ioremap_page_range+0x370/0x3c8
pci_remap_iospace+0x7c/0xac
pci_parse_request_of_pci_ranges+0x13c/0x190
rcar_pcie_probe+0x4c/0xb04
platform_drv_probe+0x50/0xbc
driver_probe_device+0x21c/0x308
__device_attach_driver+0x98/0xc8
bus_for_each_drv+0x54/0x94
__device_attach+0xc4/0x12c
device_initial_probe+0x10/0x18
bus_probe_device+0x90/0x98
deferred_probe_work_func+0xb0/0x150
process_one_work+0x12c/0x29c
worker_thread+0x200/0x3fc
kthread+0x108/0x134
ret_from_fork+0x10/0x18
Code: f9004ba2 54000080 aa0003fb 17ffff48 (d4210000)
It turned out that pci_remap_iospace() wasn't undone when the driver's
probe failed, and since devm_phy_optional_get() returned -EPROBE_DEFER,
the probe was retried, finally causing the BUG due to trying to remap
already remapped pages.
Introduce the devm_pci_remap_iospace() managed API and replace the
pci_remap_iospace() call with it to fix the bug.
Fixes: dbf9826d5797 ("PCI: generic: Convert to DT resource parsing API")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
[lorenzo.pieralisi@....com: split commit/updated the commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
---
drivers/pci/host/pci-host-common.c | 2 -
drivers/pci/host/pcie-rcar.c | 2 -
drivers/pci/pci.c | 38 +++++++++++++++++++++++++++++++++++++
include/linux/pci.h | 2 +
4 files changed, 42 insertions(+), 2 deletions(-)
Index: linux-stable/drivers/pci/host/pci-host-common.c
===================================================================
--- linux-stable.orig/drivers/pci/host/pci-host-common.c
+++ linux-stable/drivers/pci/host/pci-host-common.c
@@ -45,7 +45,7 @@ static int gen_pci_parse_request_of_pci_
switch (resource_type(res)) {
case IORESOURCE_IO:
- err = pci_remap_iospace(res, iobase);
+ err = devm_pci_remap_iospace(dev, res, iobase);
if (err) {
dev_warn(dev, "error %d: failed to map resource %pR\n",
err, res);
Index: linux-stable/drivers/pci/host/pcie-rcar.c
===================================================================
--- linux-stable.orig/drivers/pci/host/pcie-rcar.c
+++ linux-stable/drivers/pci/host/pcie-rcar.c
@@ -1102,7 +1102,7 @@ static int rcar_pcie_parse_request_of_pc
struct resource *res = win->res;
if (resource_type(res) == IORESOURCE_IO) {
- err = pci_remap_iospace(res, iobase);
+ err = devm_pci_remap_iospace(dev, res, iobase);
if (err) {
dev_warn(dev, "error %d: failed to map resource %pR\n",
err, res);
Index: linux-stable/drivers/pci/pci.c
===================================================================
--- linux-stable.orig/drivers/pci/pci.c
+++ linux-stable/drivers/pci/pci.c
@@ -3407,6 +3407,44 @@ void pci_unmap_iospace(struct resource *
#endif
}
+static void devm_pci_unmap_iospace(struct device *dev, void *ptr)
+{
+ struct resource **res = ptr;
+
+ pci_unmap_iospace(*res);
+}
+
+/**
+ * devm_pci_remap_iospace - Managed pci_remap_iospace()
+ * @dev: Generic device to remap IO address for
+ * @res: Resource describing the I/O space
+ * @phys_addr: physical address of range to be mapped
+ *
+ * Managed pci_remap_iospace(). Map is automatically unmapped on driver
+ * detach.
+ */
+int devm_pci_remap_iospace(struct device *dev, const struct resource *res,
+ phys_addr_t phys_addr)
+{
+ const struct resource **ptr;
+ int error;
+
+ ptr = devres_alloc(devm_pci_unmap_iospace, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ error = pci_remap_iospace(res, phys_addr);
+ if (error) {
+ devres_free(ptr);
+ } else {
+ *ptr = res;
+ devres_add(dev, ptr);
+ }
+
+ return error;
+}
+EXPORT_SYMBOL(devm_pci_remap_iospace);
+
static void __pci_set_master(struct pci_dev *dev, bool enable)
{
u16 old_cmd, cmd;
Index: linux-stable/include/linux/pci.h
===================================================================
--- linux-stable.orig/include/linux/pci.h
+++ linux-stable/include/linux/pci.h
@@ -1190,6 +1190,8 @@ int pci_register_io_range(phys_addr_t ad
unsigned long pci_address_to_pio(phys_addr_t addr);
phys_addr_t pci_pio_to_address(unsigned long pio);
int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
+int devm_pci_remap_iospace(struct device *dev, const struct resource *res,
+ phys_addr_t phys_addr);
void pci_unmap_iospace(struct resource *res);
static inline pci_bus_addr_t pci_bus_address(struct pci_dev *pdev, int bar)
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