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Date: Sun, 10 Aug 2008 00:36:25 -0700
From: Yinghai Lu <yhlu.kernel@...il.com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
Mike Travis <travis@....com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH 36/43] remove >= nr_irqs checking with config_have_sparse_irq
v2: fix checking about result irq_cfg_without_new, so could use msi again
v3: use irq_desc_without_new to check irq is valid
Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
---
arch/x86/kernel/io_apic_64.c | 9 -------
arch/x86/kernel/irq_64.c | 2 +-
kernel/irq/chip.c | 49 +++++++++++++++++++++++------------------
kernel/irq/manage.c | 43 +++++++++++++++++++++++-------------
4 files changed, 55 insertions(+), 48 deletions(-)
diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index a2e3dda..1a45bf6 100644
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -400,7 +400,6 @@ static inline void io_apic_sync(unsigned int apic)
struct irq_cfg *cfg; \
struct irq_pin_list *entry; \
\
- BUG_ON(irq >= nr_irqs); \
cfg = irq_cfg(irq); \
entry = cfg->irq_2_pin; \
for (;;) { \
@@ -480,7 +479,6 @@ static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
struct irq_cfg *cfg;
struct irq_pin_list *entry;
- BUG_ON(irq >= nr_irqs);
cfg = irq_cfg(irq);
entry = cfg->irq_2_pin;
for (;;) {
@@ -549,7 +547,6 @@ static void add_pin_to_irq(unsigned int irq, int apic, int pin)
struct irq_cfg *cfg;
struct irq_pin_list *entry;
- BUG_ON(irq >= nr_irqs);
/* first time to refer irq_cfg, so with new */
cfg = irq_cfg_with_new(irq);
entry = cfg->irq_2_pin;
@@ -841,7 +838,6 @@ int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
best_guess = irq;
}
}
- BUG_ON(best_guess >= nr_irqs);
return best_guess;
}
@@ -973,7 +969,6 @@ static int pin_2_irq(int idx, int apic, int pin)
irq += nr_ioapic_registers[i++];
irq += pin;
}
- BUG_ON(irq >= nr_irqs);
return irq;
}
@@ -995,7 +990,6 @@ static int __assign_irq_vector(int irq, cpumask_t mask)
int cpu;
struct irq_cfg *cfg;
- BUG_ON((unsigned)irq >= nr_irqs);
cfg = irq_cfg(irq);
/* Only try and allocate irqs on cpus that are present */
@@ -1069,7 +1063,6 @@ static void __clear_irq_vector(int irq)
cpumask_t mask;
int cpu, vector;
- BUG_ON((unsigned)irq >= nr_irqs);
cfg = irq_cfg(irq);
BUG_ON(!cfg->vector);
@@ -1921,8 +1914,6 @@ asmlinkage void smp_irq_move_cleanup_interrupt(void)
struct irq_desc *desc;
struct irq_cfg *cfg;
irq = __get_cpu_var(vector_irq)[vector];
- if (irq >= nr_irqs)
- continue;
desc = irq_desc(irq);
cfg = irq_cfg(irq);
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index ee5ee2d..edcbbb8 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -202,7 +202,7 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
stack_overflow_check(regs);
#endif
- if (likely(irq < nr_irqs))
+ if (likely(irq_desc_without_new(irq)))
generic_handle_irq(irq);
else {
if (!disable_apic)
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 9b8ea26..bed6322 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -27,13 +27,13 @@ void dynamic_irq_init(unsigned int irq)
struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs) {
+ desc = irq_desc(irq);
+ if (!desc) {
WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
return;
}
/* Ensure we don't have left over values from a previous use of this irq */
- desc = irq_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
desc->status = IRQ_DISABLED;
desc->chip = &no_irq_chip;
@@ -60,12 +60,12 @@ void dynamic_irq_cleanup(unsigned int irq)
struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs) {
+ desc = irq_desc_without_new(irq);
+ if (!desc) {
WARN(1, KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
return;
}
- desc = irq_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
if (desc->action) {
spin_unlock_irqrestore(&desc->lock, flags);
@@ -92,7 +92,8 @@ int set_irq_chip(unsigned int irq, struct irq_chip *chip)
struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs) {
+ desc = irq_desc_without_new(irq);
+ if (!desc) {
WARN(1, KERN_ERR "Trying to install chip for IRQ%d\n", irq);
return -EINVAL;
}
@@ -121,12 +122,12 @@ int set_irq_type(unsigned int irq, unsigned int type)
unsigned long flags;
int ret = -ENXIO;
- if (irq >= nr_irqs) {
+ desc = irq_desc_without_new(irq);
+ if (!desc) {
printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
return -ENODEV;
}
- desc = irq_desc(irq);
if (desc->chip->set_type) {
spin_lock_irqsave(&desc->lock, flags);
ret = desc->chip->set_type(irq, type);
@@ -148,13 +149,13 @@ int set_irq_data(unsigned int irq, void *data)
struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs) {
+ desc = irq_desc_without_new(irq);
+ if (!desc) {
printk(KERN_ERR
"Trying to install controller data for IRQ%d\n", irq);
return -EINVAL;
}
- desc = irq_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
desc->handler_data = data;
spin_unlock_irqrestore(&desc->lock, flags);
@@ -174,12 +175,13 @@ int set_irq_msi(unsigned int irq, struct msi_desc *entry)
struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs) {
+ desc = irq_desc_without_new(irq);
+ if (!desc) {
printk(KERN_ERR
"Trying to install msi data for IRQ%d\n", irq);
return -EINVAL;
}
- desc = irq_desc(irq);
+
spin_lock_irqsave(&desc->lock, flags);
desc->msi_desc = entry;
if (entry)
@@ -200,8 +202,14 @@ int set_irq_chip_data(unsigned int irq, void *data)
struct irq_desc *desc;
unsigned long flags;
- desc = irq_desc(irq);
- if (irq >= nr_irqs || !desc->chip) {
+ desc = irq_desc_without_new(irq);
+ if (!desc) {
+ printk(KERN_ERR
+ "Trying to install chip data for IRQ%d\n", irq);
+ return -EINVAL;
+ }
+
+ if (!desc->chip) {
printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
return -EINVAL;
}
@@ -545,14 +553,13 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs) {
+ desc = irq_desc_without_new(irq);
+ if (!desc) {
printk(KERN_ERR
"Trying to install type control for IRQ%d\n", irq);
return;
}
- desc = irq_desc(irq);
-
if (!handle)
handle = handle_bad_irq;
else if (desc->chip == &no_irq_chip) {
@@ -610,14 +617,13 @@ void __init set_irq_noprobe(unsigned int irq)
struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs) {
+ desc = irq_desc_without_new(irq);
+ if (!desc) {
printk(KERN_ERR "Trying to mark IRQ%d non-probeable\n", irq);
return;
}
- desc = irq_desc(irq);
-
spin_lock_irqsave(&desc->lock, flags);
desc->status |= IRQ_NOPROBE;
spin_unlock_irqrestore(&desc->lock, flags);
@@ -628,14 +634,13 @@ void __init set_irq_probe(unsigned int irq)
struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs) {
+ desc = irq_desc_without_new(irq);
+ if (!desc) {
printk(KERN_ERR "Trying to mark IRQ%d probeable\n", irq);
return;
}
- desc = irq_desc(irq);
-
spin_lock_irqsave(&desc->lock, flags);
desc->status &= ~IRQ_NOPROBE;
spin_unlock_irqrestore(&desc->lock, flags);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index b7e30f2..f87277d 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -31,10 +31,10 @@ cpumask_t irq_default_affinity = CPU_MASK_ALL;
*/
void synchronize_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc(irq);
+ struct irq_desc *desc = irq_desc_without_new(irq);
unsigned int status;
- if (irq >= nr_irqs)
+ if (!desc)
return;
do {
@@ -142,10 +142,11 @@ int irq_select_affinity(unsigned int irq)
*/
void disable_irq_nosync(unsigned int irq)
{
- struct irq_desc *desc = irq_desc(irq);
+ struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs)
+ desc = irq_desc_without_new(irq);
+ if (!desc)
return;
spin_lock_irqsave(&desc->lock, flags);
@@ -171,9 +172,10 @@ EXPORT_SYMBOL(disable_irq_nosync);
*/
void disable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc(irq);
+ struct irq_desc *desc;
- if (irq >= nr_irqs)
+ desc = irq_desc_without_new(irq);
+ if (!desc)
return;
disable_irq_nosync(irq);
@@ -213,10 +215,11 @@ static void __enable_irq(struct irq_desc *desc, unsigned int irq)
*/
void enable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc(irq);
+ struct irq_desc *desc;
unsigned long flags;
- if (irq >= nr_irqs)
+ desc = irq_desc_without_new(irq);
+ if (!desc)
return;
spin_lock_irqsave(&desc->lock, flags);
@@ -290,10 +293,14 @@ EXPORT_SYMBOL(set_irq_wake);
*/
int can_request_irq(unsigned int irq, unsigned long irqflags)
{
- struct irq_desc *desc = irq_desc(irq);
+ struct irq_desc *desc;
struct irqaction *action;
- if (irq >= nr_irqs || desc->status & IRQ_NOREQUEST)
+ desc = irq_desc_without_new(irq);
+ if (!desc)
+ return 0;
+
+ if (desc->status & IRQ_NOREQUEST)
return 0;
action = desc->action;
@@ -345,14 +352,15 @@ static int __irq_set_trigger(struct irq_chip *chip, unsigned int irq,
*/
int setup_irq(unsigned int irq, struct irqaction *new)
{
- struct irq_desc *desc = irq_desc(irq);
+ struct irq_desc *desc;
struct irqaction *old, **p;
const char *old_name = NULL;
unsigned long flags;
int shared = 0;
int ret;
- if (irq >= nr_irqs)
+ desc = irq_desc_without_new(irq);
+ if (!desc)
return -EINVAL;
if (desc->chip == &no_irq_chip)
@@ -506,10 +514,11 @@ void free_irq(unsigned int irq, void *dev_id)
unsigned long flags;
WARN_ON(in_interrupt());
- if (irq >= nr_irqs)
+
+ desc = irq_desc_without_new(irq);
+ if (!desc)
return;
- desc = irq_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
p = &desc->action;
for (;;) {
@@ -621,9 +630,11 @@ int request_irq(unsigned int irq, irq_handler_t handler,
*/
if ((irqflags & IRQF_SHARED) && !dev_id)
return -EINVAL;
- if (irq >= nr_irqs)
+
+ desc = irq_desc_without_new(irq);
+ if (!desc)
return -EINVAL;
- desc = irq_desc(irq);
+
if (desc->status & IRQ_NOREQUEST)
return -EINVAL;
if (!handler)
--
1.5.4.5
--
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