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scsi: hisi_sas: Change common allocation mode of device id

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To reduce possibility of hitting unknown SoC bugs and aid debugging and
test, change allocation mode of device id from last used device id instead
of lowest available index.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Xiang Chen 2018-05-21 18:09:15 +08:00 committed by Martin K. Petersen
parent fa3be0f231
commit 1b86518581
2 changed files with 6 additions and 1 deletions
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1
drivers/scsi/hisi_sas/hisi_sas.h
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@ -275,6 +275,7 @@ struct hisi_hba {
int slot_index_count;
int last_slot_index;
int last_dev_id;
unsigned long *slot_index_tags;
unsigned long reject_stp_links_msk;

6
drivers/scsi/hisi_sas/hisi_sas_main.c
View File

@ -596,10 +596,12 @@ static struct hisi_sas_device *hisi_sas_alloc_dev(struct domain_device *device)
struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
struct hisi_sas_device *sas_dev = NULL;
unsigned long flags;
int last = hisi_hba->last_dev_id;
int first = (hisi_hba->last_dev_id + 1) % HISI_SAS_MAX_DEVICES;
int i;
spin_lock_irqsave(&hisi_hba->lock, flags);
for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) {
for (i = first; i != last; i %= HISI_SAS_MAX_DEVICES) {
if (hisi_hba->devices[i].dev_type == SAS_PHY_UNUSED) {
int queue = i % hisi_hba->queue_count;
struct hisi_sas_dq *dq = &hisi_hba->dq[queue];
@ -614,7 +616,9 @@ static struct hisi_sas_device *hisi_sas_alloc_dev(struct domain_device *device)
INIT_LIST_HEAD(&hisi_hba->devices[i].list);
break;
}
i++;
}
hisi_hba->last_dev_id = i;
spin_unlock_irqrestore(&hisi_hba->lock, flags);
return sas_dev;