Commit-ID: ad3f8d5afe503faa78d61a50a1f6eec3afa7c787
Gitweb: http://git.kernel.org/tip/ad3f8d5afe503faa78d61a50a1f6eec3afa7c787
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Tue, 4 Aug 2015 14:02:56 +0930
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 6 Aug 2015 00:14:58 +0200
x86/lguest: Do not setup unused irq vectors
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@xxxxxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1438662776-4823-2-git-send-email-rusty@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/lguest/boot.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index d933a11..2165f45 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -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));
--
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