1 files changed, 24 insertions, 6 deletions

diff --git a/drivers/scsi/sata_nv.c b/drivers/scsi/sata_nv.c
index c0cf52cb975a..bbbb55eeb73a 100644
--- a/drivers/scsi/sata_nv.c
+++ b/drivers/scsi/sata_nv.c
@@ -29,6 +29,12 @@
  *  NV-specific details such as register offsets, SATA phy location,
  *  hotplug info, etc.
  *
+ *  0.10
+ *     - Fixed spurious interrupts issue seen with the Maxtor 6H500F0 500GB
+ *       drive.  Also made the check_hotplug() callbacks return whether there
+ *       was a hotplug interrupt or not.  This was not the source of the
+ *       spurious interrupts, but is the right thing to do anyway.
+ *
  *  0.09
  *     - Fixed bug introduced by 0.08's MCP51 and MCP55 support.
  *
@@ -124,10 +130,10 @@ static void nv_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
 static void nv_host_stop (struct ata_host_set *host_set);
 static void nv_enable_hotplug(struct ata_probe_ent *probe_ent);
 static void nv_disable_hotplug(struct ata_host_set *host_set);
-static void nv_check_hotplug(struct ata_host_set *host_set);
+static int nv_check_hotplug(struct ata_host_set *host_set);
 static void nv_enable_hotplug_ck804(struct ata_probe_ent *probe_ent);
 static void nv_disable_hotplug_ck804(struct ata_host_set *host_set);
-static void nv_check_hotplug_ck804(struct ata_host_set *host_set);
+static int nv_check_hotplug_ck804(struct ata_host_set *host_set);
 
 enum nv_host_type
 {
@@ -176,7 +182,7 @@ struct nv_host_desc
         enum nv_host_type       host_type;
         void                    (*enable_hotplug)(struct ata_probe_ent *probe_ent);
         void                    (*disable_hotplug)(struct ata_host_set *host_set);
-        void                    (*check_hotplug)(struct ata_host_set *host_set);
+        int                     (*check_hotplug)(struct ata_host_set *host_set);
 
 };
 static struct nv_host_desc nv_device_tbl[] = {
@@ -309,12 +315,16 @@ static irqreturn_t nv_interrupt (int irq, void *dev_instance,
                         qc = ata_qc_from_tag(ap, ap->active_tag);
                         if (qc && (!(qc->tf.ctl & ATA_NIEN)))
                                 handled += ata_host_intr(ap, qc);
+                        else
+                                // No request pending?  Clear interrupt status
+                                // anyway, in case there's one pending.
+                                ap->ops->check_status(ap);
                 }
 
         }
 
         if (host->host_desc->check_hotplug)
-                host->host_desc->check_hotplug(host_set);
+                handled += host->host_desc->check_hotplug(host_set);
 
         spin_unlock_irqrestore(&host_set->lock, flags);
 
@@ -497,7 +507,7 @@ static void nv_disable_hotplug(struct ata_host_set *host_set)
         outb(intr_mask, host_set->ports[0]->ioaddr.scr_addr + NV_INT_ENABLE);
 }
 
-static void nv_check_hotplug(struct ata_host_set *host_set)
+static int nv_check_hotplug(struct ata_host_set *host_set)
 {
         u8 intr_status;
 
@@ -522,7 +532,11 @@ static void nv_check_hotplug(struct ata_host_set *host_set)
                 if (intr_status & NV_INT_STATUS_SDEV_REMOVED)
                         printk(KERN_WARNING "nv_sata: "
                                 "Secondary device removed\n");
+
+                return 1;
         }
+
+        return 0;
 }
 
 static void nv_enable_hotplug_ck804(struct ata_probe_ent *probe_ent)
@@ -560,7 +574,7 @@ static void nv_disable_hotplug_ck804(struct ata_host_set *host_set)
         pci_write_config_byte(pdev, NV_MCP_SATA_CFG_20, regval);
 }
 
-static void nv_check_hotplug_ck804(struct ata_host_set *host_set)
+static int nv_check_hotplug_ck804(struct ata_host_set *host_set)
 {
         u8 intr_status;
 
@@ -585,7 +599,11 @@ static void nv_check_hotplug_ck804(struct ata_host_set *host_set)
                 if (intr_status & NV_INT_STATUS_SDEV_REMOVED)
                         printk(KERN_WARNING "nv_sata: "
                                 "Secondary device removed\n");
+
+                return 1;
         }
+
+        return 0;
 }
 
 static int __init nv_init(void)