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[ARM] traps: don't call undef hook functions with spinlock held 

Calling the undefined instruction handler functions with a
spinlock held is a recipe for must_sleep() warnings.  Avoid it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2008-08-11 12:27:16 +01:00 committed by Russell King
parent f64c0accea
commit b03a5b7559
1 changed files with 18 additions and 13 deletions
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31
arch/arm/kernel/traps.c
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@ -288,14 +288,28 @@ void unregister_undef_hook(struct undef_hook *hook)
spin_unlock_irqrestore(&undef_lock, flags); spin_unlock_irqrestore(&undef_lock, flags);
} }
static int call_undef_hook(struct pt_regs *regs, unsigned int instr)
{
struct undef_hook *hook;
unsigned long flags;
int (*fn)(struct pt_regs *regs, unsigned int instr) = NULL;
spin_lock_irqsave(&undef_lock, flags);
list_for_each_entry(hook, &undef_hook, node)
if ((instr & hook->instr_mask) == hook->instr_val &&
(regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val)
fn = hook->fn;
spin_unlock_irqrestore(&undef_lock, flags);
return fn ? fn(regs, instr) : 1;
}
asmlinkage void __exception do_undefinstr(struct pt_regs *regs) asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
{ {
unsigned int correction = thumb_mode(regs) ? 2 : 4; unsigned int correction = thumb_mode(regs) ? 2 : 4;
unsigned int instr; unsigned int instr;
struct undef_hook *hook;
siginfo_t info; siginfo_t info;
void __user *pc; void __user *pc;
unsigned long flags;
/* /*
* According to the ARM ARM, PC is 2 or 4 bytes ahead, * According to the ARM ARM, PC is 2 or 4 bytes ahead,
@ -325,17 +339,8 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
} }
#endif #endif
spin_lock_irqsave(&undef_lock, flags); if (call_undef_hook(regs, instr) == 0)
list_for_each_entry(hook, &undef_hook, node) { return;
if ((instr & hook->instr_mask) == hook->instr_val &&
(regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val) {
if (hook->fn(regs, instr) == 0) {
spin_unlock_irqrestore(&undef_lock, flags);
return;
}
}
}
spin_unlock_irqrestore(&undef_lock, flags);
#ifdef CONFIG_DEBUG_USER #ifdef CONFIG_DEBUG_USER
if (user_debug & UDBG_UNDEFINED) { if (user_debug & UDBG_UNDEFINED) {