[SCSI] aha152x: fix variable use before initialisation and other bugs

- change interface of the reset functions from Scsi_Cmnd to Scsi_Host.
- add functions with the original interface and rename the new
  functions to reflect the new interface.
- call these from the pcmcia driver, thereby avoiding the need to
  construct a (broken) Scsi_Cmnd from a Scsi_Host.
- just run the bh if the interrupt is from the controller and if so
  ensure that it's only called once per interrupt.

Signed-off-by: Juergen E. Fischer <fischer@linux-buechse.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 54 insertions, 37 deletions

diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c
index cb2ee25f213f..531a1f9ceb51 100644
--- a/drivers/scsi/aha152x.c
+++ b/drivers/scsi/aha152x.c
@@ -1260,16 +1260,15 @@ static void free_hard_reset_SCs(struct Scsi_Host *shpnt, Scsi_Cmnd **SCs)
  * Reset the bus
  *
  */
-static int aha152x_bus_reset(Scsi_Cmnd *SCpnt)
+static int aha152x_bus_reset_host(struct Scsi_Host *shpnt)
 {
-        struct Scsi_Host *shpnt = SCpnt->device->host;
         unsigned long flags;
 
         DO_LOCK(flags);
 
 #if defined(AHA152X_DEBUG)
         if(HOSTDATA(shpnt)->debug & debug_eh) {
-                printk(DEBUG_LEAD "aha152x_bus_reset(%p)", CMDINFO(SCpnt), SCpnt);
+                printk(KERN_DEBUG "scsi%d: bus reset", shpnt->host_no);
                 show_queues(shpnt);
         }
 #endif
@@ -1277,14 +1276,14 @@ static int aha152x_bus_reset(Scsi_Cmnd *SCpnt)
         free_hard_reset_SCs(shpnt, &ISSUE_SC);
         free_hard_reset_SCs(shpnt, &DISCONNECTED_SC);
 
-        DPRINTK(debug_eh, DEBUG_LEAD "resetting bus\n", CMDINFO(SCpnt));
+        DPRINTK(debug_eh, KERN_DEBUG "scsi%d: resetting bus\n", shpnt->host_no);
 
         SETPORT(SCSISEQ, SCSIRSTO);
         mdelay(256);
         SETPORT(SCSISEQ, 0);
         mdelay(DELAY);
 
-        DPRINTK(debug_eh, DEBUG_LEAD "bus resetted\n", CMDINFO(SCpnt));
+        DPRINTK(debug_eh, KERN_DEBUG "scsi%d: bus resetted\n", shpnt->host_no);
 
         setup_expected_interrupts(shpnt);
         if(HOSTDATA(shpnt)->commands==0)
@@ -1295,6 +1294,14 @@ static int aha152x_bus_reset(Scsi_Cmnd *SCpnt)
         return SUCCESS;
 }
 
+/*
+ * Reset the bus
+ *
+ */
+static int aha152x_bus_reset(Scsi_Cmnd *SCpnt)
+{
+        return aha152x_bus_reset_host(SCpnt->device->host);
+}
 
 /*
  *  Restore default values to the AIC-6260 registers and reset the fifos
@@ -1337,23 +1344,28 @@ static void reset_ports(struct Scsi_Host *shpnt)
  * Reset the host (bus and controller)
  *
  */
-int aha152x_host_reset(Scsi_Cmnd * SCpnt)
+int aha152x_host_reset_host(struct Scsi_Host *shpnt)
 {
-#if defined(AHA152X_DEBUG)
-        struct Scsi_Host *shpnt = SCpnt->device->host;
-#endif
-
-        DPRINTK(debug_eh, DEBUG_LEAD "aha152x_host_reset(%p)\n", CMDINFO(SCpnt), SCpnt);
+        DPRINTK(debug_eh, KERN_DEBUG "scsi%d: host reset\n", shpnt->host_no);
 
-        aha152x_bus_reset(SCpnt);
+        aha152x_bus_reset_host(shpnt);
 
-        DPRINTK(debug_eh, DEBUG_LEAD "resetting ports\n", CMDINFO(SCpnt));
-        reset_ports(SCpnt->device->host);
+        DPRINTK(debug_eh, KERN_DEBUG "scsi%d: resetting ports\n", shpnt->host_no);
+        reset_ports(shpnt);
 
         return SUCCESS;
 }
 
 /*
+ * Reset the host (bus and controller)
+ * 
+ */
+static int aha152x_host_reset(Scsi_Cmnd *SCpnt)
+{
+        return aha152x_host_reset_host(SCpnt->device->host);
+}
+
+/*
  * Return the "logical geometry"
  *
  */
@@ -1431,22 +1443,18 @@ static void run(void)
 {
         int i;
         for (i = 0; i<ARRAY_SIZE(aha152x_host); i++) {
-                struct Scsi_Host *shpnt = aha152x_host[i];
-                if (shpnt && HOSTDATA(shpnt)->service) {
-                        HOSTDATA(shpnt)->service=0;
-                        is_complete(shpnt);
-                }
+                is_complete(aha152x_host[i]);
         }
 }
 
 /*
- *    Interrupts handler
+ * Interrupt handler
  *
  */
-
 static irqreturn_t intr(int irqno, void *dev_id, struct pt_regs *regs)
 {
         struct Scsi_Host *shpnt = lookup_irq(irqno);
+        unsigned long flags;
         unsigned char rev, dmacntrl0;
 
         if (!shpnt) {
@@ -1472,23 +1480,23 @@ static irqreturn_t intr(int irqno, void *dev_id, struct pt_regs *regs)
         if ((rev == 0xFF) && (dmacntrl0 == 0xFF))
                 return IRQ_NONE;
 
+        if( TESTLO(DMASTAT, INTSTAT) )
+                return IRQ_NONE;        
+
         /* no more interrupts from the controller, while we're busy.
            INTEN is restored by the BH handler */
         CLRBITS(DMACNTRL0, INTEN);
 
-#if 0
-        /* check if there is already something to be
-           serviced; should not happen */
-        if(HOSTDATA(shpnt)->service) {
-                printk(KERN_ERR "aha152x%d: lost interrupt (%d)\n", HOSTNO, HOSTDATA(shpnt)->service);
-                show_queues(shpnt);
+        DO_LOCK(flags);
+        if( HOSTDATA(shpnt)->service==0 ) {
+                HOSTDATA(shpnt)->service=1;
+
+                /* Poke the BH handler */
+                INIT_WORK(&aha152x_tq, (void *) run, NULL);
+                schedule_work(&aha152x_tq);
         }
-#endif
-        
-        /* Poke the BH handler */
-        HOSTDATA(shpnt)->service++;
-        INIT_WORK(&aha152x_tq, (void *) run, NULL);
-        schedule_work(&aha152x_tq);
+        DO_UNLOCK(flags);
+
         return IRQ_HANDLED;
 }
 
@@ -2527,7 +2535,18 @@ static void is_complete(struct Scsi_Host *shpnt)
         unsigned long flags;
         int pending;
 
+        if(!shpnt)
+                return;
+
         DO_LOCK(flags);
+
+        if( HOSTDATA(shpnt)->service==0 )  {
+                DO_UNLOCK(flags);
+                return;
+        }
+
+        HOSTDATA(shpnt)->service = 0;
+
         if(HOSTDATA(shpnt)->in_intr) {
                 DO_UNLOCK(flags);
                 /* aha152x_error never returns.. */
diff --git a/drivers/scsi/aha152x.h b/drivers/scsi/aha152x.h
index d277613af29b..d2add24d02a3 100644
--- a/drivers/scsi/aha152x.h
+++ b/drivers/scsi/aha152x.h
@@ -332,6 +332,6 @@ struct aha152x_setup {
 
 struct Scsi_Host *aha152x_probe_one(struct aha152x_setup *);
 void aha152x_release(struct Scsi_Host *);
-int aha152x_host_reset(Scsi_Cmnd *);
+int aha152x_host_reset_host(struct Scsi_Host *);
 
 #endif /* _AHA152X_H */
diff --git a/drivers/scsi/pcmcia/aha152x_stub.c b/drivers/scsi/pcmcia/aha152x_stub.c
index 0c9edb7051f4..5609847e254a 100644
--- a/drivers/scsi/pcmcia/aha152x_stub.c
+++ b/drivers/scsi/pcmcia/aha152x_stub.c
@@ -275,10 +275,8 @@ static int aha152x_resume(struct pcmcia_device *dev)
 
         link->state &= ~DEV_SUSPEND;
         if (link->state & DEV_CONFIG) {
-                Scsi_Cmnd tmp;
                 pcmcia_request_configuration(link->handle, &link->conf);
-                tmp.device->host = info->host;
-                aha152x_host_reset(&tmp);
+                aha152x_host_reset_host(info->host);
         }
 
         return 0;