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Subject[PATCH 20/71] ncr5380: Introduce unbound workqueue
Allocate a work queue that will permit busy waiting and sleeping. This
means NCR5380_init() can potentially fail, so add this error path.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>

---

In subsequent patches, the work function adopts this work queue so it
can sleep while polling, which allows the removal of some flawed and
complicated code in NCR5380_select() in NCR5380.c.

---
drivers/scsi/NCR5380.c | 15 +++++++++++----
drivers/scsi/NCR5380.h | 1 +
drivers/scsi/arm/cumana_1.c | 8 ++++++--
drivers/scsi/arm/oak.c | 8 ++++++--
drivers/scsi/atari_NCR5380.c | 8 +++++++-
drivers/scsi/atari_scsi.c | 5 ++++-
drivers/scsi/dmx3191d.c | 17 +++++++++++------
drivers/scsi/dtc.c | 11 +++++++++--
drivers/scsi/g_NCR5380.c | 31 +++++++++++++++----------------
drivers/scsi/mac_scsi.c | 5 ++++-
drivers/scsi/pas16.c | 10 ++++++++--
drivers/scsi/sun3_scsi.c | 5 ++++-
drivers/scsi/t128.c | 13 ++++++++++---
13 files changed, 96 insertions(+), 41 deletions(-)

Index: linux/drivers/scsi/NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/NCR5380.c 2015-11-18 19:33:25.000000000 +1100
+++ linux/drivers/scsi/NCR5380.c 2015-11-18 19:33:27.000000000 +1100
@@ -514,7 +514,7 @@ static int should_disconnect(unsigned ch
static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
{
hostdata->time_expires = jiffies + timeout;
- schedule_delayed_work(&hostdata->coroutine, timeout);
+ queue_delayed_work(hostdata->work_q, &hostdata->coroutine, timeout);
}


@@ -791,7 +791,12 @@ static int NCR5380_init(struct Scsi_Host
hostdata->disconnected_queue = NULL;

INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main);
-
+ hostdata->work_q = alloc_workqueue("ncr5380_%d",
+ WQ_CPU_INTENSIVE | WQ_UNBOUND | WQ_MEM_RECLAIM,
+ 1, instance->host_no);
+ if (!hostdata->work_q)
+ return -ENOMEM;
+
/* The CHECK code seems to break the 53C400. Will check it later maybe */
if (flags & FLAG_NCR53C400)
hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
@@ -872,6 +877,7 @@ static void NCR5380_exit(struct Scsi_Hos
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;

cancel_delayed_work_sync(&hostdata->coroutine);
+ destroy_workqueue(hostdata->work_q);
}

/**
@@ -932,7 +938,7 @@ static int NCR5380_queue_command_lck(str

/* Run the coroutine if it isn't already running. */
/* Kick off command processing */
- schedule_delayed_work(&hostdata->coroutine, 0);
+ queue_delayed_work(hostdata->work_q, &hostdata->coroutine, 0);
return 0;
}

@@ -1128,7 +1134,8 @@ static irqreturn_t NCR5380_intr(int dumm
} /* if BASR_IRQ */
spin_unlock_irqrestore(instance->host_lock, flags);
if(!done)
- schedule_delayed_work(&hostdata->coroutine, 0);
+ queue_delayed_work(hostdata->work_q,
+ &hostdata->coroutine, 0);
} while (!done);
return IRQ_HANDLED;
}
Index: linux/drivers/scsi/NCR5380.h
===================================================================
--- linux.orig/drivers/scsi/NCR5380.h 2015-11-18 19:33:21.000000000 +1100
+++ linux/drivers/scsi/NCR5380.h 2015-11-18 19:33:27.000000000 +1100
@@ -284,6 +284,7 @@ struct NCR5380_hostdata {
unsigned spin_max_r;
unsigned spin_max_w;
#endif
+ struct workqueue_struct *work_q;
};

#ifdef __KERNEL__
Index: linux/drivers/scsi/arm/cumana_1.c
===================================================================
--- linux.orig/drivers/scsi/arm/cumana_1.c 2015-11-18 19:33:26.000000000 +1100
+++ linux/drivers/scsi/arm/cumana_1.c 2015-11-18 19:33:27.000000000 +1100
@@ -238,7 +238,9 @@ static int cumanascsi1_probe(struct expa

host->irq = ec->irq;

- NCR5380_init(host, 0);
+ ret = NCR5380_init(host, 0);
+ if (ret)
+ goto out_unmap;

NCR5380_maybe_reset_bus(host);

@@ -250,7 +252,7 @@ static int cumanascsi1_probe(struct expa
if (ret) {
printk("scsi%d: IRQ%d not free: %d\n",
host->host_no, host->irq, ret);
- goto out_unmap;
+ goto out_exit;
}

ret = scsi_add_host(host, &ec->dev);
@@ -262,6 +264,8 @@ static int cumanascsi1_probe(struct expa

out_free_irq:
free_irq(host->irq, host);
+ out_exit:
+ NCR5380_exit(host);
out_unmap:
iounmap(priv(host)->base);
iounmap(priv(host)->dma);
Index: linux/drivers/scsi/arm/oak.c
===================================================================
--- linux.orig/drivers/scsi/arm/oak.c 2015-11-18 19:33:10.000000000 +1100
+++ linux/drivers/scsi/arm/oak.c 2015-11-18 19:33:27.000000000 +1100
@@ -143,17 +143,21 @@ static int oakscsi_probe(struct expansio
host->irq = NO_IRQ;
host->n_io_port = 255;

- NCR5380_init(host, 0);
+ ret = NCR5380_init(host, 0);
+ if (ret)
+ goto out_unmap;

NCR5380_maybe_reset_bus(host);

ret = scsi_add_host(host, &ec->dev);
if (ret)
- goto out_unmap;
+ goto out_exit;

scsi_scan_host(host);
goto out;

+ out_exit:
+ NCR5380_exit(host);
out_unmap:
iounmap(priv(host)->base);
unreg:
Index: linux/drivers/scsi/atari_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:24.000000000 +1100
+++ linux/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:27.000000000 +1100
@@ -643,7 +643,7 @@ static inline void queue_main(struct NCR
queue it on the 'immediate' task queue, to be processed
immediately after the current interrupt processing has
finished. */
- schedule_work(&hostdata->main_task);
+ queue_work(hostdata->work_q, &hostdata->main_task);
}
/* else: nothing to do: the running NCR5380_main() will pick up
any newly queued command. */
@@ -832,6 +832,11 @@ static int __init NCR5380_init(struct Sc
hostdata->flags = flags;

INIT_WORK(&hostdata->main_task, NCR5380_main);
+ hostdata->work_q = alloc_workqueue("ncr5380_%d",
+ WQ_CPU_INTENSIVE | WQ_UNBOUND | WQ_MEM_RECLAIM,
+ 1, instance->host_no);
+ if (!hostdata->work_q)
+ return -ENOMEM;

prepare_info(instance);

@@ -907,6 +912,7 @@ static void NCR5380_exit(struct Scsi_Hos
struct NCR5380_hostdata *hostdata = shost_priv(instance);

cancel_work_sync(&hostdata->main_task);
+ destroy_workqueue(hostdata->work_q);
}

/**
Index: linux/drivers/scsi/atari_scsi.c
===================================================================
--- linux.orig/drivers/scsi/atari_scsi.c 2015-11-18 19:33:15.000000000 +1100
+++ linux/drivers/scsi/atari_scsi.c 2015-11-18 19:33:27.000000000 +1100
@@ -885,7 +885,9 @@ static int __init atari_scsi_probe(struc
#endif
host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;

- NCR5380_init(instance, host_flags);
+ error = NCR5380_init(instance, host_flags);
+ if (error)
+ goto fail_init;

if (IS_A_TT()) {
error = request_irq(instance->irq, scsi_tt_intr, 0,
@@ -947,6 +949,7 @@ fail_host:
free_irq(instance->irq, instance);
fail_irq:
NCR5380_exit(instance);
+fail_init:
scsi_host_put(instance);
fail_alloc:
if (atari_dma_buffer)
Index: linux/drivers/scsi/dmx3191d.c
===================================================================
--- linux.orig/drivers/scsi/dmx3191d.c 2015-11-18 19:33:10.000000000 +1100
+++ linux/drivers/scsi/dmx3191d.c 2015-11-18 19:33:27.000000000 +1100
@@ -95,7 +95,9 @@ static int dmx3191d_probe_one(struct pci
*/
shost->irq = NO_IRQ;

- NCR5380_init(shost, FLAG_NO_PSEUDO_DMA | FLAG_DTC3181E);
+ error = NCR5380_init(shost, FLAG_NO_PSEUDO_DMA | FLAG_DTC3181E);
+ if (error)
+ goto out_host_put;

NCR5380_maybe_reset_bus(shost);

@@ -103,11 +105,15 @@ static int dmx3191d_probe_one(struct pci

error = scsi_add_host(shost, &pdev->dev);
if (error)
- goto out_release_region;
+ goto out_exit;

scsi_scan_host(shost);
return 0;

+out_exit:
+ NCR5380_exit(shost);
+out_host_put:
+ scsi_host_put(shost);
out_release_region:
release_region(io, DMX3191D_REGION_LEN);
out_disable_device:
@@ -119,15 +125,14 @@ static int dmx3191d_probe_one(struct pci
static void dmx3191d_remove_one(struct pci_dev *pdev)
{
struct Scsi_Host *shost = pci_get_drvdata(pdev);
+ unsigned long io = shost->io_port;

scsi_remove_host(shost);

NCR5380_exit(shost);
-
- release_region(shost->io_port, DMX3191D_REGION_LEN);
- pci_disable_device(pdev);
-
scsi_host_put(shost);
+ release_region(io, DMX3191D_REGION_LEN);
+ pci_disable_device(pdev);
}

static struct pci_device_id dmx3191d_pci_tbl[] = {
Index: linux/drivers/scsi/dtc.c
===================================================================
--- linux.orig/drivers/scsi/dtc.c 2015-11-18 19:33:26.000000000 +1100
+++ linux/drivers/scsi/dtc.c 2015-11-18 19:33:27.000000000 +1100
@@ -230,12 +230,13 @@ static int __init dtc_detect(struct scsi
found:
instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
if (instance == NULL)
- break;
+ goto out_unmap;

instance->base = addr;
((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;

- NCR5380_init(instance, 0);
+ if (NCR5380_init(instance, 0))
+ goto out_unregister;

NCR5380_maybe_reset_bus(instance);

@@ -275,6 +276,12 @@ found:
++count;
}
return count;
+
+out_unregister:
+ scsi_unregister(instance);
+out_unmap:
+ iounmap(base);
+ return count;
}

/*
Index: linux/drivers/scsi/g_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/g_NCR5380.c 2015-11-18 19:33:25.000000000 +1100
+++ linux/drivers/scsi/g_NCR5380.c 2015-11-18 19:33:27.000000000 +1100
@@ -239,9 +239,6 @@ static int __init do_DTC3181E_setup(char
* and DTC436(ISAPnP) controllers. If overrides have been set we use
* them.
*
- * The caller supplied NCR5380_init function is invoked from here, before
- * the interrupt line is taken.
- *
* Locks: none
*/

@@ -404,15 +401,8 @@ static int __init generic_NCR5380_detect
}
#endif
instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
- if (instance == NULL) {
-#ifndef SCSI_G_NCR5380_MEM
- release_region(overrides[current_override].NCR5380_map_name, region_size);
-#else
- iounmap(iomem);
- release_mem_region(base, NCR5380_region_size);
-#endif
- continue;
- }
+ if (instance == NULL)
+ goto out_release;

#ifndef SCSI_G_NCR5380_MEM
instance->io_port = overrides[current_override].NCR5380_map_name;
@@ -429,7 +419,8 @@ static int __init generic_NCR5380_detect
((struct NCR5380_hostdata *)instance->hostdata)->iomem = iomem;
#endif

- NCR5380_init(instance, flags);
+ if (NCR5380_init(instance, flags))
+ goto out_unregister;

if (overrides[current_override].board == BOARD_NCR53C400)
NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
@@ -461,6 +452,17 @@ static int __init generic_NCR5380_detect
++count;
}
return count;
+
+out_unregister:
+ scsi_unregister(instance);
+out_release:
+#ifndef SCSI_G_NCR5380_MEM
+ release_region(overrides[current_override].NCR5380_map_name, region_size);
+#else
+ iounmap(iomem);
+ release_mem_region(base, NCR5380_region_size);
+#endif
+ return count;
}

/**
@@ -477,15 +479,12 @@ static int generic_NCR5380_release_resou
if (instance->irq != NO_IRQ)
free_irq(instance->irq, instance);
NCR5380_exit(instance);
-
#ifndef SCSI_G_NCR5380_MEM
release_region(instance->io_port, instance->n_io_port);
#else
iounmap(((struct NCR5380_hostdata *)instance->hostdata)->iomem);
release_mem_region(instance->base, NCR5380_region_size);
#endif
-
-
return 0;
}

Index: linux/drivers/scsi/mac_scsi.c
===================================================================
--- linux.orig/drivers/scsi/mac_scsi.c 2015-11-18 19:33:15.000000000 +1100
+++ linux/drivers/scsi/mac_scsi.c 2015-11-18 19:33:27.000000000 +1100
@@ -382,7 +382,9 @@ static int __init mac_scsi_probe(struct
#endif
host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;

- NCR5380_init(instance, host_flags);
+ error = NCR5380_init(instance, host_flags);
+ if (error)
+ goto fail_init;

if (instance->irq != NO_IRQ) {
error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
@@ -407,6 +409,7 @@ fail_host:
free_irq(instance->irq, instance);
fail_irq:
NCR5380_exit(instance);
+fail_init:
scsi_host_put(instance);
return error;
}
Index: linux/drivers/scsi/pas16.c
===================================================================
--- linux.orig/drivers/scsi/pas16.c 2015-11-18 19:33:26.000000000 +1100
+++ linux/drivers/scsi/pas16.c 2015-11-18 19:33:27.000000000 +1100
@@ -378,11 +378,12 @@ static int __init pas16_detect(struct sc

instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
if(instance == NULL)
- break;
+ goto out;

instance->io_port = io_port;

- NCR5380_init(instance, 0);
+ if (NCR5380_init(instance, 0))
+ goto out_unregister;

NCR5380_maybe_reset_bus(instance);

@@ -418,6 +419,11 @@ static int __init pas16_detect(struct sc
++count;
}
return count;
+
+out_unregister:
+ scsi_unregister(instance);
+out:
+ return count;
}

/*
Index: linux/drivers/scsi/sun3_scsi.c
===================================================================
--- linux.orig/drivers/scsi/sun3_scsi.c 2015-11-18 19:33:15.000000000 +1100
+++ linux/drivers/scsi/sun3_scsi.c 2015-11-18 19:33:27.000000000 +1100
@@ -557,7 +557,9 @@ static int __init sun3_scsi_probe(struct
host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
#endif

- NCR5380_init(instance, host_flags);
+ error = NCR5380_init(instance, host_flags);
+ if (error)
+ goto fail_init;

error = request_irq(instance->irq, scsi_sun3_intr, 0,
"NCR5380", instance);
@@ -604,6 +606,7 @@ fail_host:
free_irq(instance->irq, instance);
fail_irq:
NCR5380_exit(instance);
+fail_init:
scsi_host_put(instance);
fail_alloc:
if (udc_regs)
Index: linux/drivers/scsi/t128.c
===================================================================
--- linux.orig/drivers/scsi/t128.c 2015-11-18 19:33:26.000000000 +1100
+++ linux/drivers/scsi/t128.c 2015-11-18 19:33:27.000000000 +1100
@@ -208,12 +208,13 @@ static int __init t128_detect(struct scs
found:
instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
if(instance == NULL)
- break;
-
+ goto out_unmap;
+
instance->base = base;
((struct NCR5380_hostdata *)instance->hostdata)->base = p;

- NCR5380_init(instance, 0);
+ if (NCR5380_init(instance, 0))
+ goto out_unregister;

NCR5380_maybe_reset_bus(instance);

@@ -246,6 +247,12 @@ found:
++count;
}
return count;
+
+out_unregister:
+ scsi_unregister(instance);
+out_unmap:
+ iounmap(p);
+ return count;
}

static int t128_release(struct Scsi_Host *shost)



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