ipmi: only register one si per bmc

Only register one si per bmc.  Use any user-provided devices first,
followed by the first device with an irq, followed by the first device
discovered.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 27 insertions, 2 deletions

diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 3f2a4900fe1..9b9e1e915cf 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -3298,6 +3298,14 @@ static __devinit int init_ipmi_si(void)
 
         hardcode_find_bmc();
 
+        /* If the user gave us a device, they presumably want us to use it */
+        mutex_lock(&smi_infos_lock);
+        if (!list_empty(&smi_infos)) {
+                mutex_unlock(&smi_infos_lock);
+                return 0;
+        }
+        mutex_unlock(&smi_infos_lock);
+
 #ifdef CONFIG_DMI
         dmi_find_bmc();
 #endif
@@ -3321,10 +3329,27 @@ static __devinit int init_ipmi_si(void)
         of_register_platform_driver(&ipmi_of_platform_driver);
 #endif
 
+        /* Try to register something with interrupts first */
+
         mutex_lock(&smi_infos_lock);
         list_for_each_entry(e, &smi_infos, link) {
-                if (!e->si_sm)
-                        try_smi_init(e);
+                if (e->irq) {
+                        if (!try_smi_init(e)) {
+                                mutex_unlock(&smi_infos_lock);
+                                return 0;
+                        }
+                }
+        }
+
+        /* Fall back to the preferred device */
+
+        list_for_each_entry(e, &smi_infos, link) {
+                if (!e->irq) {
+                        if (!try_smi_init(e)) {
+                                mutex_unlock(&smi_infos_lock);
+                                return 0;
+                        }
+                }
         }
         mutex_unlock(&smi_infos_lock);