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s390/ccwgroup: require at least one ccw device

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ccwgroup_create_dev() derives the gdev's device name from gdev->cdev[0],
so make sure that this reference is valid.

For robustness only, all current ccwgroup drivers get this right.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Julian Wiedmann 2018-01-30 14:39:34 +01:00 committed by Martin Schwidefsky
parent 2c957a8ad4
commit ab7efda477
1 changed files with 4 additions and 1 deletions
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5
drivers/s390/cio/ccwgroup.c
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@ -323,6 +323,9 @@ int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv,
struct ccw_dev_id dev_id;
int rc, i;
if (num_devices < 1)
return -EINVAL;
gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]),
GFP_KERNEL);
if (!gdev)
@ -375,7 +378,7 @@ int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv,
goto error;
}
/* Check if the devices are bound to the required ccw driver. */
if (gdev->count && gdrv && gdrv->ccw_driver &&
if (gdrv && gdrv->ccw_driver &&
gdev->cdev[0]->drv != gdrv->ccw_driver) {
rc = -EINVAL;
goto error;