The common I/O layer is maintaining an "intparm" inspired by
the hardware intparm for driver usage. This "intparm" is not
only applicaple for ssch, but also for hsch/csch. The kerneldoc
states that it is only updated for hsch/csch if no prior request
is pending; however, this is not what the code does (whether
that would actually desireable is a different issue.)
Let's at least fix the kerneldoc for now.
Fixes: b2ffd8e9a76e ("[S390] cio: Add docbook comments.")
Signed-off-by: Cornelia Huck
---
drivers/s390/cio/device_ops.c | 23 +--
1 file changed, 17 insertions(+), 6 deletions(-)
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,
--
2.20.1
