[SCSI] NCR5380: Fix bugs and canonicalize irq handler usage

* Always pass the same value to free_irq() that we pass to
  request_irq().  This fixes several bugs.

* Always call NCR5380_intr() with 'irq' and 'dev_id' arguments.

  Note, scsi_falcon_intr() is the only case now where dev_id is not the
  scsi_host.

* Always pass Scsi_Host to request_irq().  For most cases, the drivers
  already did so, and I merely neated the source code line.  In other
  cases, either NULL or a non-sensical value was passed, verified to be
  unused, then changed to be Scsi_Host in anticipation of the future.

In addition to the bugs fixes, this change makes the interface usage
consistent, which in turn enables the possibility of directly
referencing Scsi_Host from all NCR5380_intr() invocations.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c
index 6f8403b..f5732d8 100644
--- a/drivers/scsi/atari_scsi.c
+++ b/drivers/scsi/atari_scsi.c
@@ -393,7 +393,7 @@ static irqreturn_t scsi_tt_intr(int irq, void *dummy)
 
 #endif /* REAL_DMA */
 
-	NCR5380_intr(0, 0);
+	NCR5380_intr(irq, dummy);
 
 #if 0
 	/* To be sure the int is not masked */
@@ -458,7 +458,7 @@ static irqreturn_t scsi_falcon_intr(int irq, void *dummy)
 
 #endif /* REAL_DMA */
 
-	NCR5380_intr(0, 0);
+	NCR5380_intr(irq, dummy);
 	return IRQ_HANDLED;
 }
 
@@ -684,7 +684,7 @@ int atari_scsi_detect(struct scsi_host_template *host)
 		 * interrupt after having cleared the pending flag for the DMA
 		 * interrupt. */
 		if (request_irq(IRQ_TT_MFP_SCSI, scsi_tt_intr, IRQ_TYPE_SLOW,
-				 "SCSI NCR5380", scsi_tt_intr)) {
+				 "SCSI NCR5380", instance)) {
 			printk(KERN_ERR "atari_scsi_detect: cannot allocate irq %d, aborting",IRQ_TT_MFP_SCSI);
 			scsi_unregister(atari_scsi_host);
 			atari_stram_free(atari_dma_buffer);
@@ -701,7 +701,7 @@ int atari_scsi_detect(struct scsi_host_template *host)
 					 IRQ_TYPE_PRIO, "Hades DMA emulator",
 					 hades_dma_emulator)) {
 				printk(KERN_ERR "atari_scsi_detect: cannot allocate irq %d, aborting (MACH_IS_HADES)",IRQ_AUTO_2);
-				free_irq(IRQ_TT_MFP_SCSI, scsi_tt_intr);
+				free_irq(IRQ_TT_MFP_SCSI, instance);
 				scsi_unregister(atari_scsi_host);
 				atari_stram_free(atari_dma_buffer);
 				atari_dma_buffer = 0;
@@ -761,7 +761,7 @@ int atari_scsi_detect(struct scsi_host_template *host)
 int atari_scsi_release(struct Scsi_Host *sh)
 {
 	if (IS_A_TT())
-		free_irq(IRQ_TT_MFP_SCSI, scsi_tt_intr);
+		free_irq(IRQ_TT_MFP_SCSI, sh);
 	if (atari_dma_buffer)
 		atari_stram_free(atari_dma_buffer);
 	return 1;