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s390/cio: ensure that a chpid is registered only once

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Improve locking in chp_new to make sure that we don't register
the same chpid twice. Chpid registration was synchronized via
the machine check handler thread but we also have codepaths to
look for new chpids triggered independent of that thread (during
IPL or resume from hibernate).

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2018-06-13 16:26:23 +02:00
committed by Martin Schwidefsky
parent 306d6c49ac
commit 87dc8a0128
2 changed files with 12 additions and 12 deletions
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3
drivers/s390/cio/css.c
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@@ -244,8 +244,7 @@ static void ssd_register_chpids(struct chsc_ssd_info *ssd)
for (i = 0; i < 8; i++) {
mask = 0x80 >> i;
if (ssd->path_mask & mask)
if (!chp_is_registered(ssd->chpid[i]))
chp_new(ssd->chpid[i]);
chp_new(ssd->chpid[i]);
}
}