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[S390] cio: make steal lock procedure more robust

Bladeren bron 
An Unconditional Reserve + Release operation (steal lock) for a
boxed device may fail when encountering special error cases
(e.g. unit checks or path errors). Fix this by using the more
robust ccw_request infrastructure for performing the steal lock
CCW program.

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 12:51:32 +01:00
gecommit door Martin Schwidefsky
bovenliggende 52ef0608e3
commit d7d12ef2be
4 gewijzigde bestanden met toevoegingen van 134 en 89 verwijderingen
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52
drivers/s390/cio/device_pgid.c
Bestand weergeven

@@ -507,3 +507,55 @@ void ccw_device_disband_start(struct ccw_device *cdev)
spid_build_cp(cdev, fn);
ccw_request_start(cdev);
}
static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2)
{
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
cp[0].cmd_code = CCW_CMD_STLCK;
cp[0].cda = (u32) (addr_t) buf1;
cp[0].count = 32;
cp[0].flags = CCW_FLAG_CC;
cp[1].cmd_code = CCW_CMD_RELEASE;
cp[1].cda = (u32) (addr_t) buf2;
cp[1].count = 32;
cp[1].flags = 0;
req->cp = cp;
}
static void stlck_callback(struct ccw_device *cdev, void *data, int rc)
{
ccw_device_stlck_done(cdev, data, rc);
}
/**
* ccw_device_stlck_start - perform unconditional release
* @cdev: ccw device
* @data: data pointer to be passed to ccw_device_stlck_done
* @buf1: data pointer used in channel program
* @buf2: data pointer used in channel program
*
* Execute a channel program on @cdev to release an existing PGID reservation.
* When finished, call ccw_device_stlck_done with a return code specifying the
* result.
*/
void ccw_device_stlck_start(struct ccw_device *cdev, void *data, void *buf1,
void *buf2)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
CIO_TRACE_EVENT(4, "stlck");
CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
/* Request setup. */
memset(req, 0, sizeof(*req));
req->timeout = PGID_TIMEOUT;
req->maxretries = PGID_RETRIES;
req->lpm = sch->schib.pmcw.pam & sch->opm;
req->data = data;
req->callback = stlck_callback;
stlck_build_cp(cdev, buf1, buf2);
ccw_request_start(cdev);
}