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Two fixes:

Browse Source 
- Fix a MIPS IRQ handling RCU bug
  - Remove a DocBook annotation for a parameter that doesn't exist anymore
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'irq-urgent-2021-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq fixes from Ingo Molnar:
 "Two fixes:

   - Fix a MIPS IRQ handling RCU bug

   - Remove a DocBook annotation for a parameter that doesn't exist
     anymore"

* tag 'irq-urgent-2021-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/mips: Fix RCU violation when using irqdomain lookup on interrupt entry
  genirq/irqdesc: Drop excess kernel-doc entry @lookup
This commit is contained in:
Linus Torvalds 2021-07-11 11:17:57 -07:00
commit 98f7fdced2
6 changed files with 31 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/mips/include/asm/irq.h
View File

@ -57,6 +57,9 @@ asmlinkage void plat_irq_dispatch(void);
extern void do_IRQ(unsigned int irq);
struct irq_domain;
extern void do_domain_IRQ(struct irq_domain *domain, unsigned int irq);
extern void arch_init_irq(void);
extern void spurious_interrupt(void);

16
arch/mips/kernel/irq.c
View File

@ -21,6 +21,7 @@
#include <linux/kallsyms.h>
#include <linux/kgdb.h>
#include <linux/ftrace.h>
#include <linux/irqdomain.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>
@ -107,3 +108,18 @@ void __irq_entry do_IRQ(unsigned int irq)
irq_exit();
}
#ifdef CONFIG_IRQ_DOMAIN
void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq)
{
struct irq_desc *desc;
irq_enter();
check_stack_overflow();
desc = irq_resolve_mapping(domain, hwirq);
if (likely(desc))
handle_irq_desc(desc);
irq_exit();
}
#endif

10
drivers/irqchip/irq-mips-cpu.c
View File

@ -127,7 +127,6 @@ static struct irq_chip mips_mt_cpu_irq_controller = {
asmlinkage void __weak plat_irq_dispatch(void)
{
unsigned long pending = read_c0_cause() & read_c0_status() & ST0_IM;
unsigned int virq;
int irq;
if (!pending) {
@ -137,12 +136,15 @@ asmlinkage void __weak plat_irq_dispatch(void)
pending >>= CAUSEB_IP;
while (pending) {
struct irq_domain *d;
irq = fls(pending) - 1;
if (IS_ENABLED(CONFIG_GENERIC_IRQ_IPI) && irq < 2)
virq = irq_linear_revmap(ipi_domain, irq);
d = ipi_domain;
else
virq = irq_linear_revmap(irq_domain, irq);
do_IRQ(virq);
d = irq_domain;
do_domain_IRQ(d, irq);
pending &= ~BIT(irq);
}
}

8
drivers/irqchip/irq-mips-gic.c
View File

@ -169,8 +169,8 @@ static void gic_handle_shared_int(bool chained)
generic_handle_domain_irq(gic_irq_domain,
GIC_SHARED_TO_HWIRQ(intr));
else
do_IRQ(irq_find_mapping(gic_irq_domain,
GIC_SHARED_TO_HWIRQ(intr)));
do_domain_IRQ(gic_irq_domain,
GIC_SHARED_TO_HWIRQ(intr));
}
}
@ -320,8 +320,8 @@ static void gic_handle_local_int(bool chained)
generic_handle_domain_irq(gic_irq_domain,
GIC_LOCAL_TO_HWIRQ(intr));
else
do_IRQ(irq_find_mapping(gic_irq_domain,
GIC_LOCAL_TO_HWIRQ(intr)));
do_domain_IRQ(gic_irq_domain,
GIC_LOCAL_TO_HWIRQ(intr));
}
}

5
drivers/irqchip/irq-pic32-evic.c
View File

@ -42,11 +42,10 @@ static void __iomem *evic_base;
asmlinkage void __weak plat_irq_dispatch(void)
{
unsigned int irq, hwirq;
unsigned int hwirq;
hwirq = readl(evic_base + REG_INTSTAT) & 0xFF;
irq = irq_linear_revmap(evic_irq_domain, hwirq);
do_IRQ(irq);
do_domain_IRQ(evic_irq_domain, hwirq);
}
static struct evic_chip_data *irqd_to_priv(struct irq_data *data)

1
kernel/irq/irqdesc.c
View File

@ -682,7 +682,6 @@ EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
* usually for a root interrupt controller
* @domain: The domain where to perform the lookup
* @hwirq: The HW irq number to convert to a logical one
* @lookup: Whether to perform the domain lookup or not
* @regs: Register file coming from the low-level handling code
*
* Returns: 0 on success, or -EINVAL if conversion has failed