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| author | Vineeth Vijayan <vneethv@linux.ibm.com> | 2021-09-10 13:45:24 +0200 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2021-09-27 13:54:38 +0200 |
| commit | 172da89ed0eaf9d9348f5decb86ad04c624b39d1 (patch) | |
| tree | eb2b3cdb8e1890633dde2a354b97b236b80178cd /drivers/s390/cio/css.h | |
| parent | 5816b3e6577eaa676ceb00a848f0fd65fe2adc29 (diff) | |
| download | linux-stable-172da89ed0eaf9d9348f5decb86ad04c624b39d1.tar.gz linux-stable-172da89ed0eaf9d9348f5decb86ad04c624b39d1.tar.bz2 linux-stable-172da89ed0eaf9d9348f5decb86ad04c624b39d1.zip | |
s390/cio: avoid excessive path-verification requests
Currently when removing a device from cio_ignore list, we trigger a
path-verification for all the subchannels available in the system. This
could lead to path-verification requests on subchannels with an online
device, which could cause unwanted delay. Instead of all the
subchannels, trigger the path-verifications to those without an online
device.
Reported-by: Julian Wiedmann <jwi@linux.ibm.com>
Fixes: 2297791c92d0 ("s390/cio: dont unregister subchannel from child-drivers")
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'drivers/s390/cio/css.h')
| -rw-r--r-- | drivers/s390/cio/css.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h index c98522cbe276..ede0b905bc6f 100644 --- a/drivers/s390/cio/css.h +++ b/drivers/s390/cio/css.h @@ -34,6 +34,14 @@ #define SNID_STATE3_MULTI_PATH 1 #define SNID_STATE3_SINGLE_PATH 0 +/* + * Conditions used to specify which subchannels need evaluation + */ +enum css_eval_cond { + CSS_EVAL_UNREG, /* unregistered subchannels */ + CSS_EVAL_NOT_ONLINE /* sch without an online-device */ +}; + struct path_state { __u8 state1 : 2; /* path state value 1 */ __u8 state2 : 2; /* path state value 2 */ @@ -136,7 +144,7 @@ static inline struct channel_subsystem *css_by_id(u8 cssid) /* Helper functions to build lists for the slow path. */ void css_schedule_eval(struct subchannel_id schid); void css_schedule_eval_all(void); -void css_schedule_eval_all_unreg(unsigned long delay); +void css_schedule_eval_cond(enum css_eval_cond, unsigned long delay); int css_complete_work(void); int sch_is_pseudo_sch(struct subchannel *); |