[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 <[e-mail]>
Signed-off-by: Corey Minyard <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/char/ipmi/ipmi_si_intf.c

···
  * IPMI Version = 0x51             IPMI 1.5
  * Manufacturer ID = A2 02 00      Dell IANA
  *
+ * Additionally, PowerEdge systems with IPMI < 1.5 may also assert
+ * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL.
+ *
  */
 #define DELL_POWEREDGE_8G_BMC_DEVICE_ID  0x20
 #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80
···
 {
 	struct ipmi_device_id *id = &smi_info->device_id;
 	const char mfr[3]=DELL_IANA_MFR_ID;
-	if (! memcmp(mfr, id->manufacturer_id, sizeof(mfr))
-	    && (id->device_id       == DELL_POWEREDGE_8G_BMC_DEVICE_ID)
-	    && (id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV)
-	    && (id->ipmi_version    == DELL_POWEREDGE_8G_BMC_IPMI_VERSION))
-	{
-		smi_info->oem_data_avail_handler =
-			oem_data_avail_to_receive_msg_avail;
+	if (! memcmp(mfr, id->manufacturer_id, sizeof(mfr))) {
+		if (id->device_id       == DELL_POWEREDGE_8G_BMC_DEVICE_ID  &&
+		    id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV &&
+		    id->ipmi_version    == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) {
+			smi_info->oem_data_avail_handler =
+				oem_data_avail_to_receive_msg_avail;
+		}
+		else if (ipmi_version_major(id) < 1 ||
+			 (ipmi_version_major(id) == 1 &&
+			  ipmi_version_minor(id) < 5)) {
+			smi_info->oem_data_avail_handler =
+				oem_data_avail_to_receive_msg_avail;
+		}
 	}
 }
 

drivers/char/ipmi/ipmi_smic_sm.c

···
 /* 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
···
 	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;
 		}