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s390/cio: allow to reset channel measurement block

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commit 0f5d050cea upstream.

Prior to commit 1bc6664bdf a call to
enable_cmf for a device for which channel measurement was already
enabled resulted in a reset of the measurement data.

What looked like bugs at the time (a 2nd allocation was triggered
but failed, reset was called regardless of previous failures, and
errors have not been reported to userspace) was actually something
at least one userspace tool depended on. Restore that behavior in
a sane way.

Fixes: 1bc6664bdf ("s390/cio: use device_lock during cmb activation")
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Ott
2016-07-12 19:57:57 +02:00
committed by Greg Kroah-Hartman
parent 144941bd99
commit e990e8ba92
1 changed files with 20 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/s390/cio/cmf.c
View File

@@ -753,6 +753,17 @@ static void reset_cmb(struct ccw_device *cdev)
cmf_generic_reset(cdev);
}
static int cmf_enabled(struct ccw_device *cdev)
{
int enabled;
spin_lock_irq(cdev->ccwlock);
enabled = !!cdev->private->cmb;
spin_unlock_irq(cdev->ccwlock);
return enabled;
}
static struct attribute_group cmf_attr_group;
static struct cmb_operations cmbops_basic = {
@@ -1153,13 +1164,8 @@ static ssize_t cmb_enable_show(struct device *dev,
char *buf)
{
struct ccw_device *cdev = to_ccwdev(dev);
int enabled;
spin_lock_irq(cdev->ccwlock);
enabled = !!cdev->private->cmb;
spin_unlock_irq(cdev->ccwlock);
return sprintf(buf, "%d\n", enabled);
return sprintf(buf, "%d\n", cmf_enabled(cdev));
}
static ssize_t cmb_enable_store(struct device *dev,
@@ -1199,15 +1205,20 @@ int ccw_set_cmf(struct ccw_device *cdev, int enable)
* @cdev: The ccw device to be enabled
*
* Returns %0 for success or a negative error value.
*
* Note: If this is called on a device for which channel measurement is already
* enabled a reset of the measurement data is triggered.
* Context:
* non-atomic
*/
int enable_cmf(struct ccw_device *cdev)
{
int ret;
int ret = 0;
device_lock(&cdev->dev);
if (cmf_enabled(cdev)) {
cmbops->reset(cdev);
goto out_unlock;
}
get_device(&cdev->dev);
ret = cmbops->alloc(cdev);
if (ret)
@@ -1226,7 +1237,7 @@ int enable_cmf(struct ccw_device *cdev)
out:
if (ret)
put_device(&cdev->dev);
out_unlock:
device_unlock(&cdev->dev);
return ret;
}