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authorFinn Thain <fthain@telegraphics.com.au>2014-11-12 16:11:56 +1100
committerChristoph Hellwig <hch@lst.de>2014-11-20 09:11:07 +0100
commit22f5f10d2dadc50bf26a482b782a5e04f6e9b362 (patch)
tree0aa5f5690db24e368f6f3b2dded068889858e9f8 /drivers/scsi/dmx3191d.c
parent3f9e986e2f1df8fa69ffe213098c1ee98f1c9584 (diff)
downloadlinux-22f5f10d2dadc50bf26a482b782a5e04f6e9b362.tar.bz2
ncr5380: Fix SCSI_IRQ_NONE bugs
Oak scsi doesn't use any IRQ, but it sets irq = IRQ_NONE rather than SCSI_IRQ_NONE. Problem is, the core NCR5380 driver expects SCSI_IRQ_NONE if it is to issue IDENTIFY commands that prevent target disconnection. And, as Geert points out, IRQ_NONE is part of enum irqreturn. Other drivers, when they can't get an IRQ or can't use one, will set host->irq = SCSI_IRQ_NONE (that is, 255). But when they exit they will attempt to free IRQ 255 which was never requested. Fix these bugs by using NO_IRQ in place of SCSI_IRQ_NONE and IRQ_NONE. That means IRQ 0 is no longer probed by ISA drivers but I don't think this matters. Setting IRQ = 255 for these ISA drivers is understood to mean no IRQ. This remains supported so as to avoid breaking existing ISA setups (which can be difficult to get working) and because existing documentation (SANE, TLDP etc) describes this usage for the ISA NCR5380 driver options. Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Reviewed-by: Hannes Reinecke <hare@suse.de> Tested-by: Michael Schmitz <schmitzmic@gmail.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/dmx3191d.c')
-rw-r--r--drivers/scsi/dmx3191d.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/scsi/dmx3191d.c b/drivers/scsi/dmx3191d.c
index 5101328656b8..6e1960a88270 100644
--- a/drivers/scsi/dmx3191d.c
+++ b/drivers/scsi/dmx3191d.c
@@ -100,7 +100,7 @@ static int dmx3191d_probe_one(struct pci_dev *pdev,
*/
printk(KERN_WARNING "dmx3191: IRQ %d not available - "
"switching to polled mode.\n", pdev->irq);
- shost->irq = SCSI_IRQ_NONE;
+ shost->irq = NO_IRQ;
}
pci_set_drvdata(pdev, shost);
@@ -113,7 +113,8 @@ static int dmx3191d_probe_one(struct pci_dev *pdev,
return 0;
out_free_irq:
- free_irq(shost->irq, shost);
+ if (shost->irq != NO_IRQ)
+ free_irq(shost->irq, shost);
out_release_region:
release_region(io, DMX3191D_REGION_LEN);
out_disable_device:
@@ -130,7 +131,7 @@ static void dmx3191d_remove_one(struct pci_dev *pdev)
NCR5380_exit(shost);
- if (shost->irq != SCSI_IRQ_NONE)
+ if (shost->irq != NO_IRQ)
free_irq(shost->irq, shost);
release_region(shost->io_port, DMX3191D_REGION_LEN);
pci_disable_device(pdev);