s390/ccwgroup: tie a ccwgroup driver to its ccw driver
authorJulian Wiedmann <jwi@linux.vnet.ibm.com>
Thu, 14 Sep 2017 07:52:32 +0000 (09:52 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Fri, 29 Sep 2017 13:51:30 +0000 (15:51 +0200)
commitf9a5d70cfaf3e32308de0abfcc95dafe4e36ea51
tree6063a9716e4239f50089567a44d48137715dd40b
parentbf7fa038707c4c7a51a8f3fc1872a7c0d2adf1d3
s390/ccwgroup: tie a ccwgroup driver to its ccw driver

When grouping devices, the ccwgroup core only checks whether all of the
devices are bound to the same ccw_driver. It has no means of checking
if the requesting ccwgroup driver actually supports this device type.
qeth implements its own device matching in qeth_core_probe_device(),
while ctcm and lcs currently have no sanity-checking at all.

Enable ccwgroup drivers to optionally defer the device type checking to
the ccwgroup core, by specifying their supported ccw_driver.
This allows us drop the device type matching from qeth, and improves
the robustness of ctcm and lcs.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/include/asm/ccwgroup.h
drivers/s390/cio/ccwgroup.c
drivers/s390/net/ctcm_main.c
drivers/s390/net/lcs.c
drivers/s390/net/qeth_core_main.c