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powerpc/opal_elog: Handle multiple writes to ack attribute 

Even though we use self removing sysfs helper, we still need
to make sure we do the final kobject delete conditionally.
sysfs_remove_file_self() will handle parallel calls to remove
the sysfs attribute file and returns true only in the caller
that removed the attribute file. The other parallel callers
are returned false. Do the final kobject delete checking
the return value of sysfs_remove_file_self().

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201014064813.109515-1-aneesh.kumar@linux.ibm.com
This commit is contained in:
Aneesh Kumar K.V 2020-10-14 12:18:13 +05:30 committed by Michael Ellerman
parent ffd0b25ca0
commit d4263b12a1
1 changed files with 8 additions and 3 deletions
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arch/powerpc/platforms/powernv/opal-elog.c
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@ -72,9 +72,14 @@ static ssize_t elog_ack_store(struct elog_obj *elog_obj,
const char *buf,
size_t count)
{
opal_send_ack_elog(elog_obj->id);
sysfs_remove_file_self(&elog_obj->kobj, &attr->attr);
kobject_put(&elog_obj->kobj);
/*
* Try to self remove this attribute. If we are successful,
* delete the kobject itself.
*/
if (sysfs_remove_file_self(&elog_obj->kobj, &attr->attr)) {
opal_send_ack_elog(elog_obj->id);
kobject_put(&elog_obj->kobj);
}
return count;
}