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authorStratos Psomadakis <psomas@cslab.ece.ntua.gr>2012-01-12 15:44:47 +1030
committerRusty Russell <rusty@rustcorp.com.au>2012-01-12 15:44:47 +1030
commitb6c96c0214138186f495e3ee73737c6fc5e4efa2 (patch)
tree991ed5cd8c219543fb32f2b919556d5634859c90 /arch/x86/lguest
parent07fe9977b6234ede1bd29e10e0323e478860c871 (diff)
lguest: Make sure interrupt is allocated ok by lguest_setup_irq
Make sure the interrupt is allocated correctly by lguest_setup_irq (check the return value of irq_alloc_desc_at for -ENOMEM) Signed-off-by: Stratos Psomadakis <psomas@cslab.ece.ntua.gr> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (cleanups and commentry)
Diffstat (limited to 'arch/x86/lguest')
-rw-r--r--arch/x86/lguest/boot.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index cf4603ba866f..642d8805bc1b 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -856,18 +856,23 @@ static void __init lguest_init_IRQ(void)
}
/*
- * With CONFIG_SPARSE_IRQ, interrupt descriptors are allocated as-needed, so
- * rather than set them in lguest_init_IRQ we are called here every time an
- * lguest device needs an interrupt.
- *
- * FIXME: irq_alloc_desc_at() can fail due to lack of memory, we should
- * pass that up!
+ * Interrupt descriptors are allocated as-needed, but low-numbered ones are
+ * reserved by the generic x86 code. So we ignore irq_alloc_desc_at if it
+ * tells us the irq is already used: other errors (ie. ENOMEM) we take
+ * seriously.
*/
-void lguest_setup_irq(unsigned int irq)
+int lguest_setup_irq(unsigned int irq)
{
- irq_alloc_desc_at(irq, 0);
+ int err;
+
+ /* Returns -ve error or vector number. */
+ err = irq_alloc_desc_at(irq, 0);
+ if (err < 0 && err != -EEXIST)
+ return err;
+
irq_set_chip_and_handler_name(irq, &lguest_irq_controller,
handle_level_irq, "level");
+ return 0;
}
/*

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