Merge tag 's390-5.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull more s390 updates from Vasily Gorbik:

 - Fix three kasan findings

 - Add PERF_EVENT_IOC_PERIOD ioctl support

 - Add Crypto Express7S support and extend sysfs attributes for pkey

 - Minor common I/O layer documentation corrections

* tag 's390-5.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/cio: exclude subchannels with no parent from pseudo check
  s390/cio: avoid calling strlen on null pointer
  s390/topology: avoid firing events before kobjs are created
  s390/cpumf: Remove mixed white space
  s390/cpum_sf: Support ioctl PERF_EVENT_IOC_PERIOD
  s390/zcrypt: CEX7S exploitation support
  s390/cio: fix intparm documentation
  s390/pkey: Add sysfs attributes to emit AES CIPHER key blobs

3 files changed, 20 insertions, 7 deletions

diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index 0005ec9285aa..b42a93736668 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -372,7 +372,7 @@ int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv,
 		goto error;
 	}
 	/* Check for trailing stuff. */
-	if (i == num_devices && strlen(buf) > 0) {
+	if (i == num_devices && buf && strlen(buf) > 0) {
 		rc = -EINVAL;
 		goto error;
 	}
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 22c55816100b..1fbfb0a93f5f 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -1388,6 +1388,8 @@ device_initcall(cio_settle_init);
 
 int sch_is_pseudo_sch(struct subchannel *sch)
 {
+	if (!sch->dev.parent)
+		return 0;
 	return sch == to_css(sch->dev.parent)->pseudo_subchannel;
 }
 
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index d722458c5928..65841af15748 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -124,9 +124,7 @@ EXPORT_SYMBOL(ccw_device_is_multipath);
 /**
  * ccw_device_clear() - terminate I/O request processing
  * @cdev: target ccw device
- * @intparm: interruption parameter; value is only used if no I/O is
- *	     outstanding, otherwise the intparm associated with the I/O request
- *	     is returned
+ * @intparm: interruption parameter to be returned upon conclusion of csch
  *
  * ccw_device_clear() calls csch on @cdev's subchannel.
  * Returns:
@@ -179,6 +177,9 @@ int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
  * completed during the time specified by @expires. If a timeout occurs, the
  * channel program is terminated via xsch, hsch or csch, and the device's
  * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
+ * The interruption handler will echo back the @intparm specified here, unless
+ * another interruption parameter is specified by a subsequent invocation of
+ * ccw_device_halt() or ccw_device_clear().
  * Returns:
  *  %0, if the operation was successful;
  *  -%EBUSY, if the device is busy, or status pending;
@@ -256,6 +257,9 @@ int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
  * Start a S/390 channel program. When the interrupt arrives, the
  * IRQ handler is called, either immediately, delayed (dev-end missing,
  * or sense required) or never (no IRQ handler registered).
+ * The interruption handler will echo back the @intparm specified here, unless
+ * another interruption parameter is specified by a subsequent invocation of
+ * ccw_device_halt() or ccw_device_clear().
  * Returns:
  *  %0, if the operation was successful;
  *  -%EBUSY, if the device is busy, or status pending;
@@ -287,6 +291,9 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
  * Start a S/390 channel program. When the interrupt arrives, the
  * IRQ handler is called, either immediately, delayed (dev-end missing,
  * or sense required) or never (no IRQ handler registered).
+ * The interruption handler will echo back the @intparm specified here, unless
+ * another interruption parameter is specified by a subsequent invocation of
+ * ccw_device_halt() or ccw_device_clear().
  * Returns:
  *  %0, if the operation was successful;
  *  -%EBUSY, if the device is busy, or status pending;
@@ -322,6 +329,9 @@ int ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
  * completed during the time specified by @expires. If a timeout occurs, the
  * channel program is terminated via xsch, hsch or csch, and the device's
  * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
+ * The interruption handler will echo back the @intparm specified here, unless
+ * another interruption parameter is specified by a subsequent invocation of
+ * ccw_device_halt() or ccw_device_clear().
  * Returns:
  *  %0, if the operation was successful;
  *  -%EBUSY, if the device is busy, or status pending;
@@ -343,11 +353,12 @@ int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
 /**
  * ccw_device_halt() - halt I/O request processing
  * @cdev: target ccw device
- * @intparm: interruption parameter; value is only used if no I/O is
- *	     outstanding, otherwise the intparm associated with the I/O request
- *	     is returned
+ * @intparm: interruption parameter to be returned upon conclusion of hsch
  *
  * ccw_device_halt() calls hsch on @cdev's subchannel.
+ * The interruption handler will echo back the @intparm specified here, unless
+ * another interruption parameter is specified by a subsequent invocation of
+ * ccw_device_clear().
  * Returns:
  *  %0 on success,
  *  -%ENODEV on device not operational,