From: Cornelia Huck <[email protected]>
These helper functions are a leftover from 2.4 sync I/O and are a
notorious source for bugs. They lead to device driver specific code
creeping into cio, and some issues can't really be fixed at all.
Device drivers can easily implement those functions themselves in a
more robust manner, so let's get rid of them.
Signed-off-by: Cornelia Huck <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
---
Documentation/feature-removal-schedule.txt | 17 +++++++++++++++++
include/asm-s390/ccwdev.h | 6 +++---
2 files changed, 20 insertions(+), 3 deletions(-)
Index: quilt-2.6/Documentation/feature-removal-schedule.txt
===================================================================
--- quilt-2.6.orig/Documentation/feature-removal-schedule.txt 2007-05-04 18:48:36.000000000 +0200
+++ quilt-2.6/Documentation/feature-removal-schedule.txt 2007-05-04 18:50:15.000000000 +0200
@@ -314,3 +314,20 @@
Who: David S. Miller <[email protected]>
---------------------------
+
+What: read_dev_chars(), read_conf_data{,_lpm}() (s390 common I/O layer)
+When: December 2007
+Why: These functions are a leftover from 2.4 times. They have several
+ problems:
+ - Duplication of checks that are done in the device driver's
+ interrupt handler
+ - common I/O layer can't do device specific error recovery
+ - device driver can't be notified for conditions happening during
+ execution of the function
+ Device drivers should issue the read device characteristics and read
+ configuration data ccws and do the appropriate error handling
+ themselves.
+Who: Cornelia Huck <[email protected]>
+
+---------------------------
+
Index: quilt-2.6/include/asm-s390/ccwdev.h
===================================================================
--- quilt-2.6.orig/include/asm-s390/ccwdev.h 2007-05-04 18:48:36.000000000 +0200
+++ quilt-2.6/include/asm-s390/ccwdev.h 2007-05-04 18:50:15.000000000 +0200
@@ -164,9 +164,9 @@
extern int ccw_device_halt(struct ccw_device *, unsigned long);
extern int ccw_device_clear(struct ccw_device *, unsigned long);
-extern int read_dev_chars(struct ccw_device *cdev, void **buffer, int length);
-extern int read_conf_data(struct ccw_device *cdev, void **buffer, int *length);
-extern int read_conf_data_lpm(struct ccw_device *cdev, void **buffer,
+extern int __deprecated read_dev_chars(struct ccw_device *cdev, void **buffer, int length);
+extern int __deprecated read_conf_data(struct ccw_device *cdev, void **buffer, int *length);
+extern int __deprecated read_conf_data_lpm(struct ccw_device *cdev, void **buffer,
int *length, __u8 lpm);
extern int ccw_device_set_online(struct ccw_device *cdev);
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
-
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