[S390] cio: fix channel path vary

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Channel path vary is currently broken: channel paths which are varied
offline are still used by Linux. The reason for this is that:

 * the path mask indicating which paths of an I/O device can be used
   is reset by each internal I/O request
 * the logic that checks if a path group is already in its designated
   target state incorrectly interprets the result "is correctly set"
   as "is correctly set and available"

Fix this by resetting the path mask only for internal I/O requests
which affect the path mask and by correcting the pgid check logic.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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This commit is contained in:

Peter Oberparleiter 2009-12-18 17:43:23 +01:00 • committed by Martin Schwidefsky

parent 83e56d0b23

commit d302e1a5db

3 changed files with 19 additions and 14 deletions

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3

drivers/s390/cio/ccwreq.c

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29

drivers/s390/cio/device_pgid.c

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1

drivers/s390/cio/io_sch.h

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