[PATCH v3 10/37] ncr5380: Fix SCSI_IRQ_NONE bugs

Finn Thain
2014-11-12T05:11:56Z

[-- Attachment #1: ncr5380-SCSI_IRQ_NONE-fixes --]
[-- Type: text/plain, Size: 17358 bytes --]

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>

---

Changes since v1:
- Define NO_IRQ macro and use that instead of IRQ_NONE.

---
drivers/scsi/NCR5380.c | 12 ++++++------
drivers/scsi/NCR5380.h | 5 ++++-
drivers/scsi/arm/oak.c | 2 +-
drivers/scsi/dmx3191d.c | 7 ++++---
drivers/scsi/dtc.c | 22 +++++++++++++---------
drivers/scsi/g_NCR5380.c | 18 +++++++++++-------
drivers/scsi/mac_scsi.c | 8 ++++----
drivers/scsi/pas16.c | 20 +++++++++++---------
drivers/scsi/sun3_scsi.c | 6 +++---
drivers/scsi/t128.c | 14 +++++++++-----
10 files changed, 66 insertions(+), 48 deletions(-)

Index: linux/drivers/scsi/dtc.c
===================================================================
--- linux.orig/drivers/scsi/dtc.c 2014-11-12 16:10:59.000000000 +1100
+++ linux/drivers/scsi/dtc.c 2014-11-12 16:11:02.000000000 +1100
@@ -254,31 +254,35 @@ found:
else
instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);

+ /* Compatibility with documented NCR5380 kernel parameters */
+ if (instance->irq == 255)
+ instance->irq = NO_IRQ;
+
#ifndef DONT_USE_INTR
/* With interrupts enabled, it will sometimes hang when doing heavy
* reads. So better not enable them until I finger it out. */
- if (instance->irq != SCSI_IRQ_NONE)
+ if (instance->irq != NO_IRQ)
if (request_irq(instance->irq, dtc_intr, 0,
"dtc", instance)) {
printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
- instance->irq = SCSI_IRQ_NONE;
+ instance->irq = NO_IRQ;
}

- if (instance->irq == SCSI_IRQ_NONE) {
+ if (instance->irq == NO_IRQ) {
printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
}
#else
- if (instance->irq != SCSI_IRQ_NONE)
+ if (instance->irq != NO_IRQ)
printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
- instance->irq = SCSI_IRQ_NONE;
+ instance->irq = NO_IRQ;
#endif
#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
#endif

printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
- if (instance->irq == SCSI_IRQ_NONE)
+ if (instance->irq == NO_IRQ)
printk(" interrupts disabled");
else
printk(" irq %d", instance->irq);
@@ -350,7 +354,7 @@ static inline int NCR5380_pread(struct S
i = 0;
NCR5380_read(RESET_PARITY_INTERRUPT_REG);
NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
- if (instance->irq == SCSI_IRQ_NONE)
+ if (instance->irq == NO_IRQ)
NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
else
NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
@@ -401,7 +405,7 @@ static inline int NCR5380_pwrite(struct
NCR5380_read(RESET_PARITY_INTERRUPT_REG);
NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
/* set direction (write) */
- if (instance->irq == SCSI_IRQ_NONE)
+ if (instance->irq == NO_IRQ)
NCR5380_write(DTC_CONTROL_REG, 0);
else
NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
@@ -440,7 +444,7 @@ static int dtc_release(struct Scsi_Host
{
NCR5380_local_declare();
NCR5380_setup(shost);
- if (shost->irq)
+ if (shost->irq != NO_IRQ)
free_irq(shost->irq, shost);
NCR5380_exit(shost);
if (shost->io_port && shost->n_io_port)
Index: linux/drivers/scsi/pas16.c
===================================================================
--- linux.orig/drivers/scsi/pas16.c 2014-11-12 16:10:59.000000000 +1100
+++ linux/drivers/scsi/pas16.c 2014-11-12 16:11:02.000000000 +1100
@@ -62,13 +62,11 @@
* If you have problems with your card not being recognized, use
* the LILO command line override. Try to get it recognized without
* interrupts. Ie, for a board at the default 0x388 base port,
- * boot: linux pas16=0x388,255
+ * boot: linux pas16=0x388,0
*
- * SCSI_IRQ_NONE (255) should be specified for no interrupt,
+ * NO_IRQ (0) should be specified for no interrupt,
* IRQ_AUTO (254) to autoprobe for an IRQ line if overridden
* on the command line.
- *
- * (IRQ_AUTO == 254, SCSI_IRQ_NONE == 255 in NCR5380.h)
*/

#include <linux/module.h>
@@ -416,15 +414,19 @@ static int __init pas16_detect(struct sc
else
instance->irq = NCR5380_probe_irq(instance, PAS16_IRQS);

- if (instance->irq != SCSI_IRQ_NONE)
+ /* Compatibility with documented NCR5380 kernel parameters */
+ if (instance->irq == 255)
+ instance->irq = NO_IRQ;
+
+ if (instance->irq != NO_IRQ)
if (request_irq(instance->irq, pas16_intr, 0,
"pas16", instance)) {
printk("scsi%d : IRQ%d not free, interrupts disabled\n",
instance->host_no, instance->irq);
- instance->irq = SCSI_IRQ_NONE;
+ instance->irq = NO_IRQ;
}

- if (instance->irq == SCSI_IRQ_NONE) {
+ if (instance->irq == NO_IRQ) {
printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
/* Disable 5380 interrupts, leave drive params the same */
@@ -438,7 +440,7 @@ static int __init pas16_detect(struct sc

printk("scsi%d : at 0x%04x", instance->host_no, (int)
instance->io_port);
- if (instance->irq == SCSI_IRQ_NONE)
+ if (instance->irq == NO_IRQ)
printk (" interrupts disabled");
else
printk (" irq %d", instance->irq);
@@ -568,7 +570,7 @@ static inline int NCR5380_pwrite (struct

static int pas16_release(struct Scsi_Host *shost)
{
- if (shost->irq)
+ if (shost->irq != NO_IRQ)
free_irq(shost->irq, shost);
NCR5380_exit(shost);
if (shost->io_port && shost->n_io_port)
Index: linux/drivers/scsi/t128.c
===================================================================
--- linux.orig/drivers/scsi/t128.c 2014-11-12 16:10:59.000000000 +1100
+++ linux/drivers/scsi/t128.c 2014-11-12 16:11:02.000000000 +1100
@@ -228,15 +228,19 @@ found:
else
instance->irq = NCR5380_probe_irq(instance, T128_IRQS);

- if (instance->irq != SCSI_IRQ_NONE)
+ /* Compatibility with documented NCR5380 kernel parameters */
+ if (instance->irq == 255)
+ instance->irq = NO_IRQ;
+
+ if (instance->irq != NO_IRQ)
if (request_irq(instance->irq, t128_intr, 0, "t128",
instance)) {
printk("scsi%d : IRQ%d not free, interrupts disabled\n",
instance->host_no, instance->irq);
- instance->irq = SCSI_IRQ_NONE;
+ instance->irq = NO_IRQ;
}

- if (instance->irq == SCSI_IRQ_NONE) {
+ if (instance->irq == NO_IRQ) {
printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
}
@@ -246,7 +250,7 @@ found:
#endif

printk("scsi%d : at 0x%08lx", instance->host_no, instance->base);
- if (instance->irq == SCSI_IRQ_NONE)
+ if (instance->irq == NO_IRQ)
printk (" interrupts disabled");
else
printk (" irq %d", instance->irq);
@@ -265,7 +269,7 @@ static int t128_release(struct Scsi_Host
{
NCR5380_local_declare();
NCR5380_setup(shost);
- if (shost->irq)
+ if (shost->irq != NO_IRQ)
free_irq(shost->irq, shost);
NCR5380_exit(shost);
if (shost->io_port && shost->n_io_port)
Index: linux/drivers/scsi/NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/NCR5380.c 2014-11-12 16:10:57.000000000 +1100
+++ linux/drivers/scsi/NCR5380.c 2014-11-12 16:11:02.000000000 +1100
@@ -574,12 +574,12 @@ static int __init __maybe_unused NCR5380
int trying_irqs, i, mask;
NCR5380_setup(instance);

- for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
+ for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1)
if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0))
trying_irqs |= mask;

timeout = jiffies + (250 * HZ / 1000);
- probe_irq = SCSI_IRQ_NONE;
+ probe_irq = NO_IRQ;

/*
* A interrupt is triggered whenever BSY = false, SEL = true
@@ -596,13 +596,13 @@ static int __init __maybe_unused NCR5380
NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);

- while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
+ while (probe_irq == NO_IRQ && time_before(jiffies, timeout))
schedule_timeout_uninterruptible(1);

NCR5380_write(SELECT_ENABLE_REG, 0);
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);

- for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
+ for (i = 1, mask = 2; i < 16; ++i, mask <<= 1)
if (trying_irqs & mask)
free_irq(i, NULL);

@@ -730,7 +730,7 @@ static int __maybe_unused NCR5380_show_i

SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
SPRINTF("io_port: %04x ", (int) instance->io_port);
- if (instance->irq == SCSI_IRQ_NONE)
+ if (instance->irq == NO_IRQ)
SPRINTF("IRQ: None.\n");
else
SPRINTF("IRQ: %d.\n", instance->irq);
@@ -1501,7 +1501,7 @@ part2:
}

dprintk(NDEBUG_SELECTION, "scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id);
- tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
+ tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun);

len = 1;
cmd->tag = 0;
Index: linux/drivers/scsi/NCR5380.h
===================================================================
--- linux.orig/drivers/scsi/NCR5380.h 2014-11-12 16:10:57.000000000 +1100
+++ linux/drivers/scsi/NCR5380.h 2014-11-12 16:11:02.000000000 +1100
@@ -232,12 +232,15 @@
* Scsi_Host structure
*/

-#define SCSI_IRQ_NONE 255
#define DMA_NONE 255
#define IRQ_AUTO 254
#define DMA_AUTO 254
#define PORT_AUTO 0xffff /* autoprobe io port for 53c400a */

+#ifndef NO_IRQ
+#define NO_IRQ 0
+#endif
+
#define FLAG_HAS_LAST_BYTE_SENT 1 /* NCR53c81 or better */
#define FLAG_CHECK_LAST_BYTE_SENT 2 /* Only test once */
#define FLAG_NCR53C400 4 /* NCR53c400 */
Index: linux/drivers/scsi/dmx3191d.c
===================================================================
--- linux.orig/drivers/scsi/dmx3191d.c 2014-11-12 16:10:57.000000000 +1100
+++ linux/drivers/scsi/dmx3191d.c 2014-11-12 16:11:02.000000000 +1100
@@ -100,7 +100,7 @@ static int dmx3191d_probe_one(struct pci
*/
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
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 p

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);
Index: linux/drivers/scsi/g_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/g_NCR5380.c 2014-11-12 16:10:59.000000000 +1100
+++ linux/drivers/scsi/g_NCR5380.c 2014-11-12 16:11:02.000000000 +1100
@@ -312,7 +312,7 @@ static int __init generic_NCR5380_detect
if (pnp_irq_valid(dev, 0))
overrides[count].irq = pnp_irq(dev, 0);
else
- overrides[count].irq = SCSI_IRQ_NONE;
+ overrides[count].irq = NO_IRQ;
if (pnp_dma_valid(dev, 0))
overrides[count].dma = pnp_dma(dev, 0);
else
@@ -432,20 +432,24 @@ static int __init generic_NCR5380_detect
else
instance->irq = NCR5380_probe_irq(instance, 0xffff);

- if (instance->irq != SCSI_IRQ_NONE)
+ /* Compatibility with documented NCR5380 kernel parameters */
+ if (instance->irq == 255)
+ instance->irq = NO_IRQ;
+
+ if (instance->irq != NO_IRQ)
if (request_irq(instance->irq, generic_NCR5380_intr,
0, "NCR5380", instance)) {
printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
- instance->irq = SCSI_IRQ_NONE;
+ instance->irq = NO_IRQ;
}

- if (instance->irq == SCSI_IRQ_NONE) {
+ if (instance->irq == NO_IRQ) {
printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
}

printk(KERN_INFO "scsi%d : at " STRVAL(NCR5380_map_name) " 0x%x", instance->host_no, (unsigned int) instance->NCR5380_instance_name);
- if (instance->irq == SCSI_IRQ_NONE)
+ if (instance->irq == NO_IRQ)
printk(" interrupts disabled");
else
printk(" irq %d", instance->irq);
@@ -486,7 +490,7 @@ static int generic_NCR5380_release_resou
NCR5380_local_declare();
NCR5380_setup(instance);

- if (instance->irq != SCSI_IRQ_NONE)
+ if (instance->irq != NO_IRQ)
free_irq(instance->irq, instance);
NCR5380_exit(instance);

@@ -796,7 +800,7 @@ static int generic_NCR5380_show_info(str
PRINTP("NO NCR53C400 driver extensions\n");
#endif
PRINTP("Using %s mapping at %s 0x%lx, " ANDP STRVAL(NCR5380_map_config) ANDP STRVAL(NCR5380_map_name) ANDP scsi_ptr->NCR5380_instance_name);
- if (scsi_ptr->irq == SCSI_IRQ_NONE)
+ if (scsi_ptr->irq == NO_IRQ)
PRINTP("no interrupt\n");
else
PRINTP("on interrupt %d\n" ANDP scsi_ptr->irq);
Index: linux/drivers/scsi/mac_scsi.c
===================================================================
--- linux.orig/drivers/scsi/mac_scsi.c 2014-11-12 16:10:59.000000000 +1100
+++ linux/drivers/scsi/mac_scsi.c 2014-11-12 16:11:02.000000000 +1100
@@ -229,15 +229,15 @@ int __init macscsi_detect(struct scsi_ho

instance->n_io_port = 255;

- if (instance->irq != SCSI_IRQ_NONE)
+ if (instance->irq != NO_IRQ)
if (request_irq(instance->irq, NCR5380_intr, 0, "ncr5380", instance)) {
printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
instance->host_no, instance->irq);
- instance->irq = SCSI_IRQ_NONE;
+ instance->irq = NO_IRQ;
}

printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
- if (instance->irq == SCSI_IRQ_NONE)
+ if (instance->irq == NO_IRQ)
printk (KERN_INFO "s disabled");
else
printk (KERN_INFO " %d", instance->irq);
@@ -252,7 +252,7 @@ int __init macscsi_detect(struct scsi_ho

int macscsi_release (struct Scsi_Host *shpnt)
{
- if (shpnt->irq != SCSI_IRQ_NONE)
+ if (shpnt->irq != NO_IRQ)
free_irq(shpnt->irq, shpnt);
NCR5380_exit(shpnt);

Index: linux/drivers/scsi/sun3_scsi.c
===================================================================
--- linux.orig/drivers/scsi/sun3_scsi.c 2014-11-12 16:10:59.000000000 +1100
+++ linux/drivers/scsi/sun3_scsi.c 2014-11-12 16:11:02.000000000 +1100
@@ -278,7 +278,7 @@ static int __init sun3scsi_detect(struct
#ifndef REAL_DMA
printk("scsi%d: IRQ%d not free, interrupts disabled\n",
instance->host_no, instance->irq);
- instance->irq = SCSI_IRQ_NONE;
+ instance->irq = NO_IRQ;
#else
printk("scsi%d: IRQ%d not free, bailing out\n",
instance->host_no, instance->irq);
@@ -288,7 +288,7 @@ static int __init sun3scsi_detect(struct

pr_info("scsi%d: %s at port %lX irq", instance->host_no,
tpnt->proc_name, instance->io_port);
- if (instance->irq == SCSI_IRQ_NONE)
+ if (instance->irq == NO_IRQ)
printk ("s disabled");
else
printk (" %d", instance->irq);
@@ -325,7 +325,7 @@ static int __init sun3scsi_detect(struct

static int sun3scsi_release(struct Scsi_Host *shpnt)
{
- if (shpnt->irq != SCSI_IRQ_NONE)
+ if (shpnt->irq != NO_IRQ)
free_irq(shpnt->irq, shpnt);

iounmap((void *)sun3_scsi_regp);
Index: linux/drivers/scsi/arm/oak.c
===================================================================
--- linux.orig/drivers/scsi/arm/oak.c 2014-11-12 16:10:57.000000000 +1100
+++ linux/drivers/scsi/arm/oak.c 2014-11-12 16:11:02.000000000 +1100
@@ -148,7 +148,7 @@ static int oakscsi_probe(struct expansio
goto unreg;
}

- host->irq = IRQ_NONE;
+ host->irq = NO_IRQ;
host->n_io_port = 255;

NCR5380_init(host, 0);