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x86/lguest: Do not setup unused irq vectors

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No point in assigning the interrupt vectors if there is no interrupt
chip installed. Move it to lguest_setup_irq() and call it from
lguest_enable_irq.

[ rusty: Typo fix and error handling ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Link: http://lkml.kernel.org/r/1438662776-4823-2-git-send-email-rusty@rustcorp.com.au
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2015-08-04 14:02:56 +09:30
parent 27a6f41c1a
commit ad3f8d5afe
1 changed files with 13 additions and 9 deletions
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22
arch/x86/lguest/boot.c
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@ -850,21 +850,29 @@ static int lguest_setup_irq(unsigned int irq)
if (err < 0 && err != -EEXIST)
return err;
/*
* Tell the Linux infrastructure that the interrupt is
* controlled by our level-based lguest interrupt controller.
*/
irq_set_chip_and_handler_name(irq, &lguest_irq_controller,
handle_level_irq, "level");
/* Some systems map "vectors" to interrupts weirdly. Not us! */
__this_cpu_write(vector_irq[FIRST_EXTERNAL_VECTOR + irq], irq);
return 0;
}
static int lguest_enable_irq(struct pci_dev *dev)
{
int err;
u8 line = 0;
/* We literally use the PCI interrupt line as the irq number. */
pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
irq_set_chip_and_handler_name(line, &lguest_irq_controller,
handle_level_irq, "level");
dev->irq = line;
return 0;
err = lguest_setup_irq(line);
if (!err)
dev->irq = line;
return err;
}
/* We don't do hotplug PCI, so this shouldn't be called. */
@ -875,17 +883,13 @@ static void lguest_disable_irq(struct pci_dev *dev)
/*
* This sets up the Interrupt Descriptor Table (IDT) entry for each hardware
* interrupt (except 128, which is used for system calls), and then tells the
* Linux infrastructure that each interrupt is controlled by our level-based
* lguest interrupt controller.
* interrupt (except 128, which is used for system calls).
*/
static void __init lguest_init_IRQ(void)
{
unsigned int i;
for (i = FIRST_EXTERNAL_VECTOR; i < FIRST_SYSTEM_VECTOR; i++) {
/* Some systems map "vectors" to interrupts weirdly. Not us! */
__this_cpu_write(vector_irq[i], i - FIRST_EXTERNAL_VECTOR);
if (i != IA32_SYSCALL_VECTOR)
set_intr_gate(i, irq_entries_start +
8 * (i - FIRST_EXTERNAL_VECTOR));