[libata] sata_vsc: fix inconsistent NULL checking

[linux-2.6-microblaze.git] / drivers / scsi / sata_vsc.c

diff --git a/drivers/scsi/sata_vsc.c b/drivers/scsi/sata_vsc.c
index b574379..b7b6c80 100644 (file)
--- a/drivers/scsi/sata_vsc.c
+++ b/drivers/scsi/sata_vsc.c
@@ -82,17 +82,20 @@
 #define VSC_SATA_PORT_OFFSET           0x200
 
 /* Error interrupt status bit offsets */
-#define VSC_SATA_INT_ERROR_E_OFFSET    2
-#define VSC_SATA_INT_ERROR_P_OFFSET    4
-#define VSC_SATA_INT_ERROR_T_OFFSET    5
-#define VSC_SATA_INT_ERROR_M_OFFSET    1
+#define VSC_SATA_INT_ERROR_CRC         0x40
+#define VSC_SATA_INT_ERROR_T           0x20
+#define VSC_SATA_INT_ERROR_P           0x10
+#define VSC_SATA_INT_ERROR_R           0x8
+#define VSC_SATA_INT_ERROR_E           0x4
+#define VSC_SATA_INT_ERROR_M           0x2
+#define VSC_SATA_INT_PHY_CHANGE        0x1
+#define VSC_SATA_INT_ERROR (VSC_SATA_INT_ERROR_CRC  | VSC_SATA_INT_ERROR_T | \
+                            VSC_SATA_INT_ERROR_P    | VSC_SATA_INT_ERROR_R | \
+                            VSC_SATA_INT_ERROR_E    | VSC_SATA_INT_ERROR_M | \
+                            VSC_SATA_INT_PHY_CHANGE)
+
 #define is_vsc_sata_int_err(port_idx, int_status) \
-        (int_status & ((1 << (VSC_SATA_INT_ERROR_E_OFFSET + (8 * port_idx))) | \
-                       (1 << (VSC_SATA_INT_ERROR_P_OFFSET + (8 * port_idx))) | \
-                       (1 << (VSC_SATA_INT_ERROR_T_OFFSET + (8 * port_idx))) | \
-                       (1 << (VSC_SATA_INT_ERROR_M_OFFSET + (8 * port_idx)))   \
-                      )\
-        )
+        (int_status & (VSC_SATA_INT_ERROR << (8 * port_idx)))
 
 
 static u32 vsc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
@@ -215,14 +218,6 @@ static irqreturn_t vsc_sata_interrupt (int irq, void *dev_instance,
 
                        ap = host_set->ports[i];
 
-                       if (is_vsc_sata_int_err(i, int_status)) {
-                               u32 err_status;
-                               printk(KERN_DEBUG "%s: ignoring interrupt(s)\n", __FUNCTION__);
-                               err_status = ap ? vsc_sata_scr_read(ap, SCR_ERROR) : 0;
-                               vsc_sata_scr_write(ap, SCR_ERROR, err_status);
-                               handled++;
-                       }
-
                        if (ap && !(ap->flags &
                                    (ATA_FLAG_PORT_DISABLED|ATA_FLAG_NOINTR))) {
                                struct ata_queued_cmd *qc;
@@ -230,12 +225,26 @@ static irqreturn_t vsc_sata_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 {
-                                       printk(KERN_DEBUG "%s: ignoring interrupt(s)\n", __FUNCTION__);
+                               } else if (is_vsc_sata_int_err(i, int_status)) {
+                                       /*
+                                        * On some chips (i.e. Intel 31244), an error 
+                                        * interrupt will sneak in at initialization
+                                        * time (phy state changes).  Clearing the SCR
+                                        * error register is not required, but it prevents
+                                        * the phy state change interrupts from recurring 
+                                        * later.
+                                        */
+                                       u32 err_status;
+                                       err_status = vsc_sata_scr_read(ap, SCR_ERROR);
+                                       printk(KERN_DEBUG "%s: clearing interrupt, "
+                                              "status %x; sata err status %x\n",
+                                              __FUNCTION__,
+                                              int_status, err_status);
+                                       vsc_sata_scr_write(ap, SCR_ERROR, err_status);
+                                       /* Clear interrupt status */
                                        ata_chk_status(ap);
                                        handled++;
                                }
-
                        }
                }
        }