Commit 61f0bfcf authored by Sebastian Ott's avatar Sebastian Ott Committed by Martin Schwidefsky
Browse files

s390/cio: ensure consistent measurement state 



Make sure that in all cases where we could not obtain measurement
characteristics the associated fields are set to invalid values.

Note: without this change the "shared" capability of a channel path
for which we could not obtain the measurement characteristics was
incorrectly displayed as 0 (not shared). We will now correctly
report "unknown" in this case.

Signed-off-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: default avatarPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 0d9bfe91

drivers/s390/cio/chp.c

+5 −8
Original line number Diff line number Diff line
@@ -466,14 +466,11 @@ int chp_new(struct chp_id chpid) 
		ret = -ENODEV;

		goto out_free;

	}

	/* Get channel-measurement characteristics. */

	if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) {



	ret = chsc_get_channel_measurement_chars(chp);

	if (ret)

		goto out_free;

	} else {

		chp->cmg = -1;

	}



	dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id);



	/* make it known to the system */

drivers/s390/cio/chsc.c

+8 −4
Original line number Diff line number Diff line
@@ -1003,6 +1003,12 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp) 
		u32 data[NR_MEASUREMENT_CHARS];

	} __attribute__ ((packed)) *scmc_area;



	chp->shared = -1;

	chp->cmg = -1;



	if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)

		return 0;



	spin_lock_irq(&chsc_page_lock);

	memset(chsc_page, 0, PAGE_SIZE);

	scmc_area = chsc_page;
@@ -1023,11 +1029,9 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp) 
			      scmc_area->response.code);

		goto out;

	}

	if (scmc_area->not_valid) {

		chp->cmg = -1;

		chp->shared = -1;

	if (scmc_area->not_valid)

		goto out;

	}



	chp->cmg = scmc_area->cmg;

	chp->shared = scmc_area->shared;

	if (chp->cmg != 2 && chp->cmg != 3) {

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