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s390/cio: clarify cssid usage

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Currently the cssid in various structures is used as the id of
the respective channel subsystem. Sometimes however we call the
index in the channel_subsystems array cssid. In some places the
id is even used as the index.

Provide a new define MAX_CSS_IDX and use it where appropriate.
In addition to that provide a dummy function to find a channel
subsystem by its id and a macro to iterate over the channel
subsystems.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2016-11-08 14:28:03 +01:00
committed by Martin Schwidefsky
parent 57c52ae757
commit 98cc43ab6b
4 changed files with 29 additions and 26 deletions
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10
drivers/s390/cio/css.h
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@@ -130,6 +130,16 @@ struct channel_subsystem {
extern struct channel_subsystem *channel_subsystems[];
/* Dummy helper which needs to change once we support more than one css. */
static inline struct channel_subsystem *css_by_id(u8 cssid)
{
return channel_subsystems[0];
}
/* Dummy iterator which needs to change once we support more than one css. */
#define for_each_css(css) \
for ((css) = channel_subsystems[0]; (css); (css) = NULL)
/* Helper functions to build lists for the slow path. */
void css_schedule_eval(struct subchannel_id schid);
void css_schedule_eval_all(void);