[PATCH 2/2] fusion: Implement generic interrupt misroute handling

[James Bottomley <James.Bottomley@HansenPartnership.com>]

This patch uses the new pci_lost_interrupt() callback to note the loss
of an interrupt, and if the reason is MSI, to work around the problem.

I used the manufacturer config page for this, because every fusion type
has that one and its loss means that mpt_config() which is interrupt
driven, failed.

James

---
diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index d6a0074..2d75c58 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -168,7 +168,7 @@ static int	mpt_readScsiDevicePageHeaders(MPT_ADAPTER *ioc, int portnum);
 static void 	mpt_read_ioc_pg_1(MPT_ADAPTER *ioc);
 static void 	mpt_read_ioc_pg_4(MPT_ADAPTER *ioc);
 static void	mpt_timer_expired(unsigned long data);
-static void	mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc);
+static int	mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc);
 static int	SendEventNotification(MPT_ADAPTER *ioc, u8 EvSwitch);
 static int	SendEventAck(MPT_ADAPTER *ioc, EventNotificationReply_t *evnp);
 static int	mpt_host_page_access_control(MPT_ADAPTER *ioc, u8 access_control_value, int sleepFlag);
@@ -2052,6 +2052,7 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
 	int	 irq_allocated = 0;
 	u8	*a;
 
+ retry:
 	printk(MYIOC_s_INFO_FMT "Initiating %s\n", ioc->name,
 	    reason == MPT_HOSTEVENT_IOC_BRINGUP ? "bringup" : "recovery");
 
@@ -2268,6 +2269,7 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
 	 *	and we try GetLanConfigPages again...
 	 */
 	if ((ret == 0) && (reason == MPT_HOSTEVENT_IOC_BRINGUP)) {
+		int rc;
 
 		/*
 		 * Initalize link list for inactive raid volumes.
@@ -2275,6 +2277,22 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
 		mutex_init(&ioc->raid_data.inactive_list_mutex);
 		INIT_LIST_HEAD(&ioc->raid_data.inactive_list);
 
+		/* May fail becuase of IRQ misrouting */
+		rc = mpt_get_manufacturing_pg_0(ioc);
+		if (rc) {
+			if (pci_lost_interrupt(ioc->pcidev) ==
+			    PCI_LOST_IRQ_DISABLE_MSI) {
+				free_irq(ioc->pci_irq, ioc);
+				ioc->msi_enable = 0;
+				pci_disable_msi(ioc->pcidev);
+				goto retry;
+			}
+			printk(MYIOC_s_ERR_FMT "Cannot recover IRQ routing\n",
+			       ioc->name);
+			return -1;
+		}
+
+
 		if (ioc->bus_type == SAS) {
 
 			/* clear persistency table */
@@ -2326,7 +2344,6 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
 		}
 
 		GetIoUnitPage2(ioc);
-		mpt_get_manufacturing_pg_0(ioc);
 	}
 
 	/*
@@ -5697,13 +5714,14 @@ mpt_read_ioc_pg_1(MPT_ADAPTER *ioc)
 	return;
 }
 
-static void
+static int
 mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc)
 {
 	CONFIGPARMS		cfg;
 	ConfigPageHeader_t	hdr;
 	dma_addr_t		buf_dma;
 	ManufacturingPage0_t	*pbuf = NULL;
+	int			ret;
 
 	memset(&cfg, 0 , sizeof(CONFIGPARMS));
 	memset(&hdr, 0 , sizeof(ConfigPageHeader_t));
@@ -5714,20 +5732,23 @@ mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc)
 	cfg.action = MPI_CONFIG_ACTION_PAGE_HEADER;
 	cfg.timeout = 10;
 
-	if (mpt_config(ioc, &cfg) != 0)
+	ret = mpt_config(ioc, &cfg);
+	if (ret != 0)
 		goto out;
 
 	if (!cfg.cfghdr.hdr->PageLength)
 		goto out;
 
 	cfg.action = MPI_CONFIG_ACTION_PAGE_READ_CURRENT;
+	ret = -ENOMEM;
 	pbuf = pci_alloc_consistent(ioc->pcidev, hdr.PageLength * 4, &buf_dma);
 	if (!pbuf)
 		goto out;
 
 	cfg.physAddr = buf_dma;
 
-	if (mpt_config(ioc, &cfg) != 0)
+	ret = mpt_config(ioc, &cfg);
+	if (ret != 0)
 		goto out;
 
 	memcpy(ioc->board_name, pbuf->BoardName, sizeof(ioc->board_name));
@@ -5738,6 +5759,7 @@ mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc)
 
 	if (pbuf)
 		pci_free_consistent(ioc->pcidev, hdr.PageLength * 4, pbuf, buf_dma);
+	return ret;
 }
 
 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/