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[S390] cio: split PGID settings and status

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Split setting (driver wants feature enabled) and status (feature
setup was successful) for PGID related ccw device features so that
setup errors can be detected. Previously, incorrectly handled setup
errors could in rare cases lead to erratic I/O behavior and
permanently unusuable devices.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter
2009-12-07 12:51:30 +01:00
committed by Martin Schwidefsky
parent 4257aaecff
commit 454e1fa1eb
8 changed files with 68 additions and 24 deletions
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33
drivers/s390/cio/device_pgid.c
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@@ -30,8 +30,8 @@ static void verify_done(struct ccw_device *cdev, int rc)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_dev_id *id = &cdev->private->dev_id;
int mpath = !cdev->private->flags.pgid_single;
int pgroup = cdev->private->options.pgroup;
int mpath = cdev->private->flags.mpath;
int pgroup = cdev->private->flags.pgroup;
if (rc)
goto out;
@@ -150,7 +150,7 @@ static void spid_do(struct ccw_device *cdev)
fn = SPID_FUNC_ESTABLISH;
else
fn = SPID_FUNC_RESIGN;
if (!cdev->private->flags.pgid_single)
if (cdev->private->flags.mpath)
fn |= SPID_FUNC_MULTI_PATH;
spid_build_cp(cdev, fn);
ccw_request_start(cdev);
@@ -177,13 +177,13 @@ static void spid_callback(struct ccw_device *cdev, void *data, int rc)
case -EACCES:
break;
case -EOPNOTSUPP:
if (!cdev->private->flags.pgid_single) {
if (cdev->private->flags.mpath) {
/* Try without multipathing. */
cdev->private->flags.pgid_single = 1;
cdev->private->flags.mpath = 0;
goto out_restart;
}
/* Try without pathgrouping. */
cdev->private->options.pgroup = 0;
cdev->private->flags.pgroup = 0;
goto out_restart;
default:
goto err;
@@ -374,7 +374,7 @@ static void verify_start(struct ccw_device *cdev)
req->timeout = PGID_TIMEOUT;
req->maxretries = PGID_RETRIES;
req->lpm = 0x80;
if (cdev->private->options.pgroup) {
if (cdev->private->flags.pgroup) {
req->callback = spid_callback;
spid_do(cdev);
} else {
@@ -400,10 +400,17 @@ void ccw_device_verify_start(struct ccw_device *cdev)
CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
if (!cdev->private->flags.pgid_rdy) {
/* No pathgrouping possible. */
cdev->private->options.pgroup = 0;
cdev->private->flags.pgid_single = 1;
} else
cdev->private->flags.pgid_single = 0;
cdev->private->flags.pgroup = 0;
cdev->private->flags.mpath = 0;
} else {
/*
* Initialize pathgroup and multipath state with target values.
* They may change in the course of path verification.
*/
cdev->private->flags.pgroup = cdev->private->options.pgroup;
cdev->private->flags.mpath = cdev->private->options.mpath;
}
cdev->private->flags.doverify = 0;
verify_start(cdev);
}
@@ -419,7 +426,7 @@ static void disband_callback(struct ccw_device *cdev, void *data, int rc)
if (rc)
goto out;
/* Ensure consistent multipathing state at device and channel. */
cdev->private->flags.pgid_single = 1;
cdev->private->flags.mpath = 0;
if (sch->config.mp) {
sch->config.mp = 0;
rc = cio_commit_config(sch);
@@ -453,7 +460,7 @@ void ccw_device_disband_start(struct ccw_device *cdev)
req->lpm = sch->schib.pmcw.pam & sch->opm;
req->callback = disband_callback;
fn = SPID_FUNC_DISBAND;
if (!cdev->private->flags.pgid_single)
if (cdev->private->flags.mpath)
fn |= SPID_FUNC_MULTI_PATH;
spid_build_cp(cdev, fn);
ccw_request_start(cdev);