Commit 814eae59 authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi Committed by Bjorn Helgaas
Browse files

alpha/PCI: Move pci_map_irq()/pci_swizzle() out of initdata 

The introduction of {map/swizzle}_irq() hooks in the struct pci_host_bridge
allowed to replace the pci_fixup_irqs() PCI IRQ allocation in alpha arch
PCI code with per-bridge map/swizzle functions with commit 0e4c2eeb
("alpha/PCI: Replace pci_fixup_irqs() call with host bridge IRQ mapping
hooks").

As a side effect of converting PCI IRQ allocation to the struct
pci_host_bridge {map/swizzle}_irq() hooks mechanism, the actual PCI IRQ
allocation function (ie pci_assign_irq()) is carried out per-device in
pci_device_probe() that is called when a PCI device driver is about to be
probed.

This means that, for drivers compiled as loadable modules, the actual PCI
device IRQ allocation can now happen after the system has booted so the
struct pci_host_bridge {map/swizzle}_irq() hooks pci_assign_irq() relies on
must stay valid after the system has booted so that PCI core can carry out
PCI IRQ allocation correctly.

Most of the alpha board structures pci_map_irq() and pci_swizzle() hooks
(that are used to initialize their struct pci_host_bridge equivalent
through the alpha_mv global variable - that represents the struct
alpha_machine_vector of the running kernel) are marked as
__init/__initdata; this causes freed memory dereferences when PCI IRQ
allocation is carried out after the kernel has booted (ie when loading PCI
drivers as loadable module) because when the kernel tries to bind the PCI
device to its (module) driver, the function pci_assign_irq() is called,
that in turn retrieves the struct pci_host_bridge {map/swizzle}_irq() hooks
to carry out PCI IRQ allocation; if those hooks are marked as __init
code/__initdata they point at freed/invalid memory.

Fix the issue by removing the __init/__initdata markers from all subarch
struct alpha_machine_vector.pci_map_irq()/pci_swizzle() functions (and
data).

Fixes: 0e4c2eeb ("alpha/PCI: Replace pci_fixup_irqs() call with host bridge IRQ mapping hooks")
Link: http://lkml.kernel.org/r/alpine.LRH.2.21.1710251043170.7098@math.ut.ee


Reported-by: default avatarMeelis Roos <mroos@linux.ee>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Meelis Roos <mroos@linux.ee>
Cc: Matt Turner <mattst88@gmail.com>
parent 407dae1e

arch/alpha/kernel/sys_alcor.c

+2 −2
Original line number Diff line number Diff line
@@ -181,10 +181,10 @@ alcor_init_irq(void) 
 * comes in on.  This makes interrupt processing much easier.

 */



static int __init

static int

alcor_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	static char irq_tab[7][5] __initdata = {

	static char irq_tab[7][5] = {

		/*INT    INTA   INTB   INTC   INTD */

		/* note: IDSEL 17 is XLT only */

		{16+13, 16+13, 16+13, 16+13, 16+13},	/* IdSel 17,  TULIP  */

arch/alpha/kernel/sys_cabriolet.c

+6 −6
Original line number Diff line number Diff line
@@ -173,10 +173,10 @@ pc164_init_irq(void) 
 * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.

 */



static inline int __init

static inline int

eb66p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	static char irq_tab[5][5] __initdata = {

	static char irq_tab[5][5] = {

		/*INT  INTA  INTB  INTC   INTD */

		{16+0, 16+0, 16+5,  16+9, 16+13},  /* IdSel 6,  slot 0, J25 */

		{16+1, 16+1, 16+6, 16+10, 16+14},  /* IdSel 7,  slot 1, J26 */
@@ -203,10 +203,10 @@ eb66p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 
 * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.

 */



static inline int __init

static inline int

cabriolet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	static char irq_tab[5][5] __initdata = {

	static char irq_tab[5][5] = {

		/*INT   INTA  INTB  INTC   INTD */

		{ 16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 5,  slot 2, J21 */

		{ 16+0, 16+0, 16+5,  16+9, 16+13}, /* IdSel 6,  slot 0, J19 */
@@ -287,10 +287,10 @@ cia_cab_init_pci(void) 
 * 

 */



static inline int __init

static inline int

alphapc164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	static char irq_tab[7][5] __initdata = {

	static char irq_tab[7][5] = {

		/*INT   INTA  INTB   INTC   INTD */

		{ 16+2, 16+2, 16+9,  16+13, 16+17}, /* IdSel  5, slot 2, J20 */

		{ 16+0, 16+0, 16+7,  16+11, 16+15}, /* IdSel  6, slot 0, J29 */

arch/alpha/kernel/sys_dp264.c

+10 −10
Original line number Diff line number Diff line
@@ -356,7 +356,7 @@ clipper_init_irq(void) 
 *  10	 64 bit PCI option slot 3 (not bus 0)

 */



static int __init

static int

isa_irq_fixup(const struct pci_dev *dev, int irq)

{

	u8 irq8;
@@ -372,10 +372,10 @@ isa_irq_fixup(const struct pci_dev *dev, int irq) 
	return irq8 & 0xf;

}



static int __init

static int

dp264_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	static char irq_tab[6][5] __initdata = {

	static char irq_tab[6][5] = {

		/*INT    INTA   INTB   INTC   INTD */

		{    -1,    -1,    -1,    -1,    -1}, /* IdSel 5 ISA Bridge */

		{ 16+ 3, 16+ 3, 16+ 2, 16+ 2, 16+ 2}, /* IdSel 6 SCSI builtin*/
@@ -394,10 +394,10 @@ dp264_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 
	return isa_irq_fixup(dev, irq);

}



static int __init

static int

monet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	static char irq_tab[13][5] __initdata = {

	static char irq_tab[13][5] = {

		/*INT    INTA   INTB   INTC   INTD */

		{    45,    45,    45,    45,    45}, /* IdSel 3 21143 PCI1 */

		{    -1,    -1,    -1,    -1,    -1}, /* IdSel 4 unused */
@@ -423,7 +423,7 @@ monet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 
	return isa_irq_fixup(dev, COMMON_TABLE_LOOKUP);

}



static u8 __init

static u8

monet_swizzle(struct pci_dev *dev, u8 *pinp)

{

	struct pci_controller *hose = dev->sysdata;
@@ -456,10 +456,10 @@ monet_swizzle(struct pci_dev *dev, u8 *pinp) 
	return slot;

}



static int __init

static int

webbrick_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	static char irq_tab[13][5] __initdata = {

	static char irq_tab[13][5] = {

		/*INT    INTA   INTB   INTC   INTD */

		{    -1,    -1,    -1,    -1,    -1}, /* IdSel 7 ISA Bridge */

		{    -1,    -1,    -1,    -1,    -1}, /* IdSel 8 unused */
@@ -478,10 +478,10 @@ webbrick_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 
	return isa_irq_fixup(dev, COMMON_TABLE_LOOKUP);

}



static int __init

static int

clipper_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	static char irq_tab[7][5] __initdata = {

	static char irq_tab[7][5] = {

		/*INT    INTA   INTB   INTC   INTD */

		{ 16+ 8, 16+ 8, 16+ 9, 16+10, 16+11}, /* IdSel 1 slot 1 */

		{ 16+12, 16+12, 16+13, 16+14, 16+15}, /* IdSel 2 slot 2 */

arch/alpha/kernel/sys_eb64p.c

+2 −2
Original line number Diff line number Diff line
@@ -167,10 +167,10 @@ eb64p_init_irq(void) 
 * comes in on.  This makes interrupt processing much easier.

 */



static int __init

static int

eb64p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	static char irq_tab[5][5] __initdata = {

	static char irq_tab[5][5] = {

		/*INT  INTA  INTB  INTC   INTD */

		{16+7, 16+7, 16+7, 16+7,  16+7},  /* IdSel 5,  slot ?, ?? */

		{16+0, 16+0, 16+2, 16+4,  16+9},  /* IdSel 6,  slot ?, ?? */

arch/alpha/kernel/sys_eiger.c

+2 −2
Original line number Diff line number Diff line
@@ -141,7 +141,7 @@ eiger_init_irq(void) 
	}

}



static int __init

static int

eiger_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

{

	u8 irq_orig;
@@ -158,7 +158,7 @@ eiger_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 
	return irq_orig - 0x80;

}



static u8 __init

static u8

eiger_swizzle(struct pci_dev *dev, u8 *pinp)

{

	struct pci_controller *hose = dev->sysdata;

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