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Message-ID: <20060830124305.GD22276@skybase>
Date: Wed, 30 Aug 2006 14:43:05 +0200
From: Martin Schwidefsky <schwidefsky@...ibm.com>
To: torvalds@...l.org, gregkh@...e.de
Cc: linux-kernel@...r.kernel.org
Subject: Please pull git390 'for-linus' branch
Please pull from 'for-linus' branch of
git://git390.osdl.marist.edu/pub/scm/linux-2.6.git for-linus
to receive the following updates:
arch/s390/lib/uaccess.S | 33 +++---
arch/s390/lib/uaccess64.S | 35 +++----
drivers/s390/block/dasd.c | 192 +++++++++++++++++++++++++++-------------
drivers/s390/block/dasd_genhd.c | 10 +-
drivers/s390/cio/ccwgroup.c | 14 +-
drivers/s390/cio/chsc.c | 10 --
drivers/s390/cio/device.c | 19 +--
drivers/s390/cio/device_fsm.c | 20 +---
drivers/s390/cio/device_pgid.c | 27 ++++-
9 files changed, 217 insertions(+), 143 deletions(-)
Heiko Carstens:
[S390] cio: kernel stack overflow.
Horst Hummel:
[S390] dasd: fix device shutdown process.
Martin Schwidefsky:
[S390] broken copy_in_user function.
Peter Oberparleiter:
[S390] cio: no path after machine check.
Stefan Bader:
[S390] cio: unsolicited interrupts during sense pgid.
diff --git a/arch/s390/lib/uaccess.S b/arch/s390/lib/uaccess.S
index 5d59e26..8372752 100644
--- a/arch/s390/lib/uaccess.S
+++ b/arch/s390/lib/uaccess.S
@@ -88,30 +88,31 @@ __copy_to_user_asm:
.globl __copy_in_user_asm
# %r2 = from, %r3 = n, %r4 = to
__copy_in_user_asm:
+ ahi %r3,-1
+ jo 6f
sacf 256
- bras 1,1f
- mvc 0(1,%r4),0(%r2)
-0: mvc 0(256,%r4),0(%r2)
- la %r2,256(%r2)
- la %r4,256(%r4)
-1: ahi %r3,-256
- jnm 0b
-2: ex %r3,0(%r1)
- sacf 0
- slr %r2,%r2
- br 14
-3: mvc 0(1,%r4),0(%r2)
+ bras %r1,4f
+0: ahi %r3,257
+1: mvc 0(1,%r4),0(%r2)
la %r2,1(%r2)
la %r4,1(%r4)
ahi %r3,-1
+ jnz 1b
+2: lr %r2,%r3
+ br %r14
+3: mvc 0(256,%r4),0(%r2)
+ la %r2,256(%r2)
+ la %r4,256(%r4)
+4: ahi %r3,-256
jnm 3b
-4: lr %r2,%r3
+5: ex %r3,4(%r1)
sacf 0
+6: slr %r2,%r2
br %r14
.section __ex_table,"a"
- .long 0b,3b
- .long 2b,3b
- .long 3b,4b
+ .long 1b,2b
+ .long 3b,0b
+ .long 5b,0b
.previous
.align 4
diff --git a/arch/s390/lib/uaccess64.S b/arch/s390/lib/uaccess64.S
index 19b41a3..1f755be 100644
--- a/arch/s390/lib/uaccess64.S
+++ b/arch/s390/lib/uaccess64.S
@@ -88,30 +88,31 @@ __copy_to_user_asm:
.globl __copy_in_user_asm
# %r2 = from, %r3 = n, %r4 = to
__copy_in_user_asm:
+ aghi %r3,-1
+ jo 6f
sacf 256
- bras 1,1f
- mvc 0(1,%r4),0(%r2)
-0: mvc 0(256,%r4),0(%r2)
- la %r2,256(%r2)
- la %r4,256(%r4)
-1: aghi %r3,-256
- jnm 0b
-2: ex %r3,0(%r1)
- sacf 0
- slgr %r2,%r2
- br 14
-3: mvc 0(1,%r4),0(%r2)
+ bras %r1,4f
+0: aghi %r3,257
+1: mvc 0(1,%r4),0(%r2)
la %r2,1(%r2)
la %r4,1(%r4)
aghi %r3,-1
+ jnz 1b
+2: lgr %r2,%r3
+ br %r14
+3: mvc 0(256,%r4),0(%r2)
+ la %r2,256(%r2)
+ la %r4,256(%r4)
+4: aghi %r3,-256
jnm 3b
-4: lgr %r2,%r3
+5: ex %r3,4(%r1)
sacf 0
- br %r14
+6: slgr %r2,%r2
+ br 14
.section __ex_table,"a"
- .quad 0b,3b
- .quad 2b,3b
- .quad 3b,4b
+ .quad 1b,2b
+ .quad 3b,0b
+ .quad 5b,0b
.previous
.align 4
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index d8e9b95..25c1ef6 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -52,7 +52,7 @@ static void dasd_setup_queue(struct dasd
static void dasd_free_queue(struct dasd_device * device);
static void dasd_flush_request_queue(struct dasd_device *);
static void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
-static void dasd_flush_ccw_queue(struct dasd_device *, int);
+static int dasd_flush_ccw_queue(struct dasd_device *, int);
static void dasd_tasklet(struct dasd_device *);
static void do_kick_device(void *data);
@@ -60,6 +60,7 @@ static void do_kick_device(void *data);
* SECTION: Operations on the device structure.
*/
static wait_queue_head_t dasd_init_waitq;
+static wait_queue_head_t dasd_flush_wq;
/*
* Allocate memory for a new device structure.
@@ -121,7 +122,7 @@ dasd_free_device(struct dasd_device *dev
/*
* Make a new device known to the system.
*/
-static inline int
+static int
dasd_state_new_to_known(struct dasd_device *device)
{
int rc;
@@ -145,7 +146,7 @@ dasd_state_new_to_known(struct dasd_devi
/*
* Let the system forget about a device.
*/
-static inline void
+static int
dasd_state_known_to_new(struct dasd_device * device)
{
/* Disable extended error reporting for this device. */
@@ -163,12 +164,13 @@ dasd_state_known_to_new(struct dasd_devi
/* Give up reference we took in dasd_state_new_to_known. */
dasd_put_device(device);
+ return 0;
}
/*
* Request the irq line for the device.
*/
-static inline int
+static int
dasd_state_known_to_basic(struct dasd_device * device)
{
int rc;
@@ -192,17 +194,23 @@ dasd_state_known_to_basic(struct dasd_de
/*
* Release the irq line for the device. Terminate any running i/o.
*/
-static inline void
+static int
dasd_state_basic_to_known(struct dasd_device * device)
{
+ int rc;
+
dasd_gendisk_free(device);
- dasd_flush_ccw_queue(device, 1);
+ rc = dasd_flush_ccw_queue(device, 1);
+ if (rc)
+ return rc;
+
DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
if (device->debug_area != NULL) {
debug_unregister(device->debug_area);
device->debug_area = NULL;
}
device->state = DASD_STATE_KNOWN;
+ return 0;
}
/*
@@ -219,7 +227,7 @@ dasd_state_basic_to_known(struct dasd_de
* In case the analysis returns an error, the device setup is stopped
* (a fake disk was already added to allow formatting).
*/
-static inline int
+static int
dasd_state_basic_to_ready(struct dasd_device * device)
{
int rc;
@@ -247,25 +255,31 @@ dasd_state_basic_to_ready(struct dasd_de
* Forget format information. Check if the target level is basic
* and if it is create fake disk for formatting.
*/
-static inline void
+static int
dasd_state_ready_to_basic(struct dasd_device * device)
{
- dasd_flush_ccw_queue(device, 0);
+ int rc;
+
+ rc = dasd_flush_ccw_queue(device, 0);
+ if (rc)
+ return rc;
dasd_destroy_partitions(device);
dasd_flush_request_queue(device);
device->blocks = 0;
device->bp_block = 0;
device->s2b_shift = 0;
device->state = DASD_STATE_BASIC;
+ return 0;
}
/*
* Back to basic.
*/
-static inline void
+static int
dasd_state_unfmt_to_basic(struct dasd_device * device)
{
device->state = DASD_STATE_BASIC;
+ return 0;
}
/*
@@ -273,7 +287,7 @@ dasd_state_unfmt_to_basic(struct dasd_de
* the requeueing of requests from the linux request queue to the
* ccw queue.
*/
-static inline int
+static int
dasd_state_ready_to_online(struct dasd_device * device)
{
device->state = DASD_STATE_ONLINE;
@@ -284,16 +298,17 @@ dasd_state_ready_to_online(struct dasd_d
/*
* Stop the requeueing of requests again.
*/
-static inline void
+static int
dasd_state_online_to_ready(struct dasd_device * device)
{
device->state = DASD_STATE_READY;
+ return 0;
}
/*
* Device startup state changes.
*/
-static inline int
+static int
dasd_increase_state(struct dasd_device *device)
{
int rc;
@@ -329,30 +344,37 @@ dasd_increase_state(struct dasd_device *
/*
* Device shutdown state changes.
*/
-static inline int
+static int
dasd_decrease_state(struct dasd_device *device)
{
+ int rc;
+
+ rc = 0;
if (device->state == DASD_STATE_ONLINE &&
device->target <= DASD_STATE_READY)
- dasd_state_online_to_ready(device);
+ rc = dasd_state_online_to_ready(device);
- if (device->state == DASD_STATE_READY &&
+ if (!rc &&
+ device->state == DASD_STATE_READY &&
device->target <= DASD_STATE_BASIC)
- dasd_state_ready_to_basic(device);
+ rc = dasd_state_ready_to_basic(device);
- if (device->state == DASD_STATE_UNFMT &&
+ if (!rc &&
+ device->state == DASD_STATE_UNFMT &&
device->target <= DASD_STATE_BASIC)
- dasd_state_unfmt_to_basic(device);
+ rc = dasd_state_unfmt_to_basic(device);
- if (device->state == DASD_STATE_BASIC &&
+ if (!rc &&
+ device->state == DASD_STATE_BASIC &&
device->target <= DASD_STATE_KNOWN)
- dasd_state_basic_to_known(device);
+ rc = dasd_state_basic_to_known(device);
- if (device->state == DASD_STATE_KNOWN &&
+ if (!rc &&
+ device->state == DASD_STATE_KNOWN &&
device->target <= DASD_STATE_NEW)
- dasd_state_known_to_new(device);
+ rc = dasd_state_known_to_new(device);
- return 0;
+ return rc;
}
/*
@@ -701,6 +723,7 @@ dasd_term_IO(struct dasd_ccw_req * cqr)
cqr->retries--;
cqr->status = DASD_CQR_CLEAR;
cqr->stopclk = get_clock();
+ cqr->starttime = 0;
DBF_DEV_EVENT(DBF_DEBUG, device,
"terminate cqr %p successful",
cqr);
@@ -978,6 +1001,7 @@ dasd_int_handler(struct ccw_device *cdev
irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
cqr->status = DASD_CQR_QUEUED;
dasd_clear_timer(device);
+ wake_up(&dasd_flush_wq);
dasd_schedule_bh(device);
return;
}
@@ -1241,6 +1265,10 @@ __dasd_check_expire(struct dasd_device *
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
if (cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) {
if (time_after_eq(jiffies, cqr->expires + cqr->starttime)) {
+ DEV_MESSAGE(KERN_ERR, device,
+ "internal error - timeout (%is) expired "
+ "for cqr %p (%i retries left)",
+ (cqr->expires/HZ), cqr, cqr->retries);
if (device->discipline->term_IO(cqr) != 0)
/* Hmpf, try again in 1/10 sec */
dasd_set_timer(device, 10);
@@ -1285,46 +1313,100 @@ __dasd_start_head(struct dasd_device * d
dasd_set_timer(device, 50);
}
+static inline int
+_wait_for_clear(struct dasd_ccw_req *cqr)
+{
+ return (cqr->status == DASD_CQR_QUEUED);
+}
+
/*
- * Remove requests from the ccw queue.
+ * Remove all requests from the ccw queue (all = '1') or only block device
+ * requests in case all = '0'.
+ * Take care of the erp-chain (chained via cqr->refers) and remove either
+ * the whole erp-chain or none of the erp-requests.
+ * If a request is currently running, term_IO is called and the request
+ * is re-queued. Prior to removing the terminated request we need to wait
+ * for the clear-interrupt.
+ * In case termination is not possible we stop processing and just finishing
+ * the already moved requests.
*/
-static void
+static int
dasd_flush_ccw_queue(struct dasd_device * device, int all)
{
+ struct dasd_ccw_req *cqr, *orig, *n;
+ int rc, i;
+
struct list_head flush_queue;
- struct list_head *l, *n;
- struct dasd_ccw_req *cqr;
INIT_LIST_HEAD(&flush_queue);
spin_lock_irq(get_ccwdev_lock(device->cdev));
- list_for_each_safe(l, n, &device->ccw_queue) {
- cqr = list_entry(l, struct dasd_ccw_req, list);
+ rc = 0;
+restart:
+ list_for_each_entry_safe(cqr, n, &device->ccw_queue, list) {
+ /* get original request of erp request-chain */
+ for (orig = cqr; orig->refers != NULL; orig = orig->refers);
+
/* Flush all request or only block device requests? */
- if (all == 0 && cqr->callback == dasd_end_request_cb)
+ if (all == 0 && cqr->callback != dasd_end_request_cb &&
+ orig->callback != dasd_end_request_cb) {
continue;
- if (cqr->status == DASD_CQR_IN_IO)
- device->discipline->term_IO(cqr);
- if (cqr->status != DASD_CQR_DONE ||
- cqr->status != DASD_CQR_FAILED) {
- cqr->status = DASD_CQR_FAILED;
+ }
+ /* Check status and move request to flush_queue */
+ switch (cqr->status) {
+ case DASD_CQR_IN_IO:
+ rc = device->discipline->term_IO(cqr);
+ if (rc) {
+ /* unable to terminate requeust */
+ DEV_MESSAGE(KERN_ERR, device,
+ "dasd flush ccw_queue is unable "
+ " to terminate request %p",
+ cqr);
+ /* stop flush processing */
+ goto finished;
+ }
+ break;
+ case DASD_CQR_QUEUED:
+ case DASD_CQR_ERROR:
+ /* set request to FAILED */
cqr->stopclk = get_clock();
+ cqr->status = DASD_CQR_FAILED;
+ break;
+ default: /* do not touch the others */
+ break;
+ }
+ /* Rechain request (including erp chain) */
+ for (i = 0; cqr != NULL; cqr = cqr->refers, i++) {
+ cqr->endclk = get_clock();
+ list_move_tail(&cqr->list, &flush_queue);
+ }
+ if (i > 1)
+ /* moved more than one request - need to restart */
+ goto restart;
+ }
+
+finished:
+ spin_unlock_irq(get_ccwdev_lock(device->cdev));
+ /* Now call the callback function of flushed requests */
+restart_cb:
+ list_for_each_entry_safe(cqr, n, &flush_queue, list) {
+ if (cqr->status == DASD_CQR_CLEAR) {
+ /* wait for clear interrupt! */
+ wait_event(dasd_flush_wq, _wait_for_clear(cqr));
+ cqr->status = DASD_CQR_FAILED;
}
/* Process finished ERP request. */
if (cqr->refers) {
__dasd_process_erp(device, cqr);
- continue;
+ /* restart list_for_xx loop since dasd_process_erp
+ * might remove multiple elements */
+ goto restart_cb;
}
- /* Rechain request on device request queue */
+ /* call the callback function */
cqr->endclk = get_clock();
- list_move_tail(&cqr->list, &flush_queue);
- }
- spin_unlock_irq(get_ccwdev_lock(device->cdev));
- /* Now call the callback function of flushed requests */
- list_for_each_safe(l, n, &flush_queue) {
- cqr = list_entry(l, struct dasd_ccw_req, list);
if (cqr->callback != NULL)
(cqr->callback)(cqr, cqr->callback_data);
}
+ return rc;
}
/*
@@ -1510,10 +1592,8 @@ dasd_sleep_on_interruptible(struct dasd_
if (device->discipline->term_IO) {
cqr->retries = -1;
device->discipline->term_IO(cqr);
- /*nished =
- * wait (non-interruptible) for final status
- * because signal ist still pending
- */
+ /* wait (non-interruptible) for final status
+ * because signal ist still pending */
spin_unlock_irq(get_ccwdev_lock(device->cdev));
wait_event(wait_q, _wait_for_wakeup(cqr));
spin_lock_irq(get_ccwdev_lock(device->cdev));
@@ -1546,19 +1626,11 @@ static inline int
_dasd_term_running_cqr(struct dasd_device *device)
{
struct dasd_ccw_req *cqr;
- int rc;
if (list_empty(&device->ccw_queue))
return 0;
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
- rc = device->discipline->term_IO(cqr);
- if (rc == 0) {
- /* termination successful */
- cqr->status = DASD_CQR_QUEUED;
- cqr->startclk = cqr->stopclk = 0;
- cqr->starttime = 0;
- }
- return rc;
+ return device->discipline->term_IO(cqr);
}
int
@@ -1726,10 +1798,7 @@ dasd_flush_request_queue(struct dasd_dev
return;
spin_lock_irq(&device->request_queue_lock);
- while (!list_empty(&device->request_queue->queue_head)) {
- req = elv_next_request(device->request_queue);
- if (req == NULL)
- break;
+ while ((req = elv_next_request(device->request_queue))) {
blkdev_dequeue_request(req);
dasd_end_request(req, 0);
}
@@ -2091,6 +2160,7 @@ dasd_init(void)
int rc;
init_waitqueue_head(&dasd_init_waitq);
+ init_waitqueue_head(&dasd_flush_wq);
/* register 'common' DASD debug area, used for all DBF_XXX calls */
dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long));
diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
index 4c272b7..d163632 100644
--- a/drivers/s390/block/dasd_genhd.c
+++ b/drivers/s390/block/dasd_genhd.c
@@ -83,10 +83,12 @@ dasd_gendisk_alloc(struct dasd_device *d
void
dasd_gendisk_free(struct dasd_device *device)
{
- del_gendisk(device->gdp);
- device->gdp->queue = NULL;
- put_disk(device->gdp);
- device->gdp = NULL;
+ if (device->gdp) {
+ del_gendisk(device->gdp);
+ device->gdp->queue = NULL;
+ put_disk(device->gdp);
+ device->gdp = NULL;
+ }
}
/*
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index 3cba6c9..38954f5 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -183,11 +183,9 @@ ccwgroup_create(struct device *root,
gdev->creator_id = creator_id;
gdev->count = argc;
- gdev->dev = (struct device ) {
- .bus = &ccwgroup_bus_type,
- .parent = root,
- .release = ccwgroup_release,
- };
+ gdev->dev.bus = &ccwgroup_bus_type;
+ gdev->dev.parent = root;
+ gdev->dev.release = ccwgroup_release;
snprintf (gdev->dev.bus_id, BUS_ID_SIZE, "%s",
gdev->cdev[0]->dev.bus_id);
@@ -391,10 +389,8 @@ int
ccwgroup_driver_register (struct ccwgroup_driver *cdriver)
{
/* register our new driver with the core */
- cdriver->driver = (struct device_driver) {
- .bus = &ccwgroup_bus_type,
- .name = cdriver->name,
- };
+ cdriver->driver.bus = &ccwgroup_bus_type;
+ cdriver->driver.name = cdriver->name;
return driver_register(&cdriver->driver);
}
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 61ce3f1..c28444a 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -238,8 +238,6 @@ s390_subchannel_remove_chpid(struct devi
/* Check for single path devices. */
if (sch->schib.pmcw.pim == 0x80)
goto out_unreg;
- if (sch->vpm == mask)
- goto out_unreg;
if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
(sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
@@ -258,6 +256,8 @@ s390_subchannel_remove_chpid(struct devi
/* trigger path verification. */
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
+ else if (sch->vpm == mask)
+ goto out_unreg;
out_unlock:
spin_unlock_irq(&sch->lock);
return 0;
@@ -1391,10 +1391,8 @@ new_channel_path(int chpid)
/* fill in status, etc. */
chp->id = chpid;
chp->state = 1;
- chp->dev = (struct device) {
- .parent = &css[0]->device,
- .release = chp_release,
- };
+ chp->dev.parent = &css[0]->device;
+ chp->dev.release = chp_release;
snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
/* Obtain channel path description and fill it in. */
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 585fa04..646da56 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -556,12 +556,11 @@ get_disc_ccwdev_by_devno(unsigned int de
struct ccw_device *sibling)
{
struct device *dev;
- struct match_data data = {
- .devno = devno,
- .ssid = ssid,
- .sibling = sibling,
- };
+ struct match_data data;
+ data.devno = devno;
+ data.ssid = ssid;
+ data.sibling = sibling;
dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
return dev ? to_ccwdev(dev) : NULL;
@@ -835,10 +834,8 @@ io_subchannel_probe (struct subchannel *
return -ENOMEM;
}
atomic_set(&cdev->private->onoff, 0);
- cdev->dev = (struct device) {
- .parent = &sch->dev,
- .release = ccw_device_release,
- };
+ cdev->dev.parent = &sch->dev;
+ cdev->dev.release = ccw_device_release;
INIT_LIST_HEAD(&cdev->private->kick_work.entry);
/* Do first half of device_register. */
device_initialize(&cdev->dev);
@@ -977,9 +974,7 @@ ccw_device_console_enable (struct ccw_de
int rc;
/* Initialize the ccw_device structure. */
- cdev->dev = (struct device) {
- .parent = &sch->dev,
- };
+ cdev->dev.parent= &sch->dev;
rc = io_subchannel_recog(cdev, sch);
if (rc)
return rc;
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 6d91c2e..35e162b 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -267,12 +267,10 @@ ccw_device_recog_done(struct ccw_device
notify = 1;
}
/* fill out sense information */
- cdev->id = (struct ccw_device_id) {
- .cu_type = cdev->private->senseid.cu_type,
- .cu_model = cdev->private->senseid.cu_model,
- .dev_type = cdev->private->senseid.dev_type,
- .dev_model = cdev->private->senseid.dev_model,
- };
+ cdev->id.cu_type = cdev->private->senseid.cu_type;
+ cdev->id.cu_model = cdev->private->senseid.cu_model;
+ cdev->id.dev_type = cdev->private->senseid.dev_type;
+ cdev->id.dev_model = cdev->private->senseid.dev_model;
if (notify) {
cdev->private->state = DEV_STATE_OFFLINE;
if (same_dev) {
@@ -566,12 +564,10 @@ ccw_device_verify_done(struct ccw_device
/* Deliver fake irb to device driver, if needed. */
if (cdev->private->flags.fake_irb) {
memset(&cdev->private->irb, 0, sizeof(struct irb));
- cdev->private->irb.scsw = (struct scsw) {
- .cc = 1,
- .fctl = SCSW_FCTL_START_FUNC,
- .actl = SCSW_ACTL_START_PEND,
- .stctl = SCSW_STCTL_STATUS_PEND,
- };
+ cdev->private->irb.scsw.cc = 1;
+ cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
+ cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
+ cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
cdev->private->flags.fake_irb = 0;
if (cdev->handler)
cdev->handler(cdev, cdev->private->intparm,
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index 32610fd..1693a10 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -24,6 +24,21 @@ #include "device.h"
#include "ioasm.h"
/*
+ * Helper function called from interrupt context to decide whether an
+ * operation should be tried again.
+ */
+static int __ccw_device_should_retry(struct scsw *scsw)
+{
+ /* CC is only valid if start function bit is set. */
+ if ((scsw->fctl & SCSW_FCTL_START_FUNC) && scsw->cc == 1)
+ return 1;
+ /* No more activity. For sense and set PGID we stubbornly try again. */
+ if (!scsw->actl)
+ return 1;
+ return 0;
+}
+
+/*
* Start Sense Path Group ID helper function. Used in ccw_device_recog
* and ccw_device_sense_pgid.
*/
@@ -155,10 +170,10 @@ ccw_device_sense_pgid_irq(struct ccw_dev
int ret;
irb = (struct irb *) __LC_IRB;
- /* Retry sense pgid for cc=1. */
+
if (irb->scsw.stctl ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
- if (irb->scsw.cc == 1) {
+ if (__ccw_device_should_retry(&irb->scsw)) {
ret = __ccw_device_sense_pgid_start(cdev);
if (ret && ret != -EBUSY)
ccw_device_sense_pgid_done(cdev, ret);
@@ -391,10 +406,10 @@ ccw_device_verify_irq(struct ccw_device
int ret;
irb = (struct irb *) __LC_IRB;
- /* Retry set pgid for cc=1. */
+
if (irb->scsw.stctl ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
- if (irb->scsw.cc == 1)
+ if (__ccw_device_should_retry(&irb->scsw))
__ccw_device_verify_start(cdev);
return;
}
@@ -494,10 +509,10 @@ ccw_device_disband_irq(struct ccw_device
int ret;
irb = (struct irb *) __LC_IRB;
- /* Retry set pgid for cc=1. */
+
if (irb->scsw.stctl ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
- if (irb->scsw.cc == 1)
+ if (__ccw_device_should_retry(&irb->scsw))
__ccw_device_disband_start(cdev);
return;
}
-
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