diff mbox

[07/15] x86 ioapic: Fix io_apic_redir_entries to return the number of entries.

Message ID 1269936436-7039-7-git-send-email-ebiederm@xmission.com (mailing list archive)
State New, archived
Headers show

Commit Message

Eric W. Biederman March 30, 2010, 8:07 a.m. UTC 
None
diff mbox

Patch

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 54ba1f7..7e139bb 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3846,7 +3846,11 @@  int __init io_apic_get_redir_entries (int ioapic)
 	reg_01.raw = io_apic_read(ioapic, 1);
 	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 
-	return reg_01.bits.entries;
+	/* The register returns the maximum index redir index
+	 * supported, which is one less than the total number of redir
+	 * entries.
+	 */
+	return reg_01.bits.entries + 1;
 }
 
 void __init probe_nr_irqs_gsi(void)
@@ -3862,7 +3866,7 @@  void __init probe_nr_irqs_gsi(void)
 
 		nr = 0;
 		for (idx = 0; idx < nr_ioapics; idx++)
-			nr += io_apic_get_redir_entries(idx) + 1;
+			nr += io_apic_get_redir_entries(idx);
 
 		if (nr > nr_irqs_gsi)
 			nr_irqs_gsi = nr;
@@ -4297,7 +4301,7 @@  void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
 	 */
 	mp_gsi_routing[idx].gsi_base = gsi_base;
 	mp_gsi_routing[idx].gsi_end = gsi_base +
-	    io_apic_get_redir_entries(idx);
+	    io_apic_get_redir_entries(idx) - 1;
 
 	printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
 	       "GSI %d-%d\n", idx, mp_ioapics[idx].apicid,