[PATCH] ipmi: more dell fixes

Make SMIC driver ignore EVT_AVAIL and SMS_ATN bits in flags register, as
they're used by systems management interrupts, not the host OS.

Make the OEM0 Data Available handler work for pre-IPMI 1.5 systems from Dell
too.

Without these two fixes, PowerEdge 2650 and other similar systems with SMIC
may hang a process (modprobe or anything using /dev/ipmi0).

Signed-off-by: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/char/ipmi/ipmi_smic_sm.c b/drivers/char/ipmi/ipmi_smic_sm.c
index f17043da9dd5..39d7e5ef1a2b 100644
--- a/drivers/char/ipmi/ipmi_smic_sm.c
+++ b/drivers/char/ipmi/ipmi_smic_sm.c
@@ -85,6 +85,12 @@ enum smic_states {
 /* SMIC Flags Register Bits */
 #define SMIC_RX_DATA_READY      0x80
 #define SMIC_TX_DATA_READY      0x40
+/*
+ * SMIC_SMI and SMIC_EVM_DATA_AVAIL are only used by
+ * a few systems, and then only by Systems Management
+ * Interrupts, not by the OS.  Always ignore these bits.
+ *
+ */
 #define SMIC_SMI                0x10
 #define SMIC_EVM_DATA_AVAIL     0x08
 #define SMIC_SMS_DATA_AVAIL     0x04
@@ -368,8 +374,7 @@ static enum si_sm_result smic_event (struct si_sm_data *smic, long time)
         switch (smic->state) {
         case SMIC_IDLE:
                 /* in IDLE we check for available messages */
-                if (flags & (SMIC_SMI |
-                             SMIC_EVM_DATA_AVAIL | SMIC_SMS_DATA_AVAIL))
+                if (flags & SMIC_SMS_DATA_AVAIL)
                 {
                         return SI_SM_ATTN;
                 }