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scsi: hisi_sas: Fix some issues related to asd_sas_port->phy_list

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Most places that use asd_sas_port->phy_list are protected by spinlock
asd_sas_port->phy_list_lock, however there are still some places which miss
grabbing the lock. Add it in function hisi_sas_refresh_port_id() when
accessing asd_sas_port->phy_list. This carries a risk that list mutates
while at the same time dropping the lock in function
hisi_sas_send_ata_reset_each_phy(). Read asd_sas_port->phy_mask instead of
accessing asd_sas_port->phy_list to avoid this risk.

Link: https://lore.kernel.org/r/1639999298-244569-6-git-send-email-chenxiang66@hisilicon.com
Acked-by: John Garry <john.garry@huawei.com>
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Xiang Chen 2021-12-20 19:21:28 +08:00 committed by Martin K. Petersen
parent 42159d3c8d
commit 29e2bac874
1 changed files with 8 additions and 3 deletions
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11
drivers/scsi/hisi_sas/hisi_sas_main.c
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@ -1428,11 +1428,13 @@ static void hisi_sas_refresh_port_id(struct hisi_hba *hisi_hba)
sas_port = device->port;
port = to_hisi_sas_port(sas_port);
spin_lock(&sas_port->phy_list_lock);
list_for_each_entry(sas_phy, &sas_port->phy_list, port_phy_el)
if (state & BIT(sas_phy->id)) {
phy = sas_phy->lldd_phy;
break;
}
spin_unlock(&sas_port->phy_list_lock);
if (phy) {
port->id = phy->port_id;
@ -1509,22 +1511,25 @@ static void hisi_sas_send_ata_reset_each_phy(struct hisi_hba *hisi_hba,
struct ata_link *link;
u8 fis[20] = {0};
u32 state;
int i;
state = hisi_hba->hw->get_phys_state(hisi_hba);
list_for_each_entry(sas_phy, &sas_port->phy_list, port_phy_el) {
for (i = 0; i < hisi_hba->n_phy; i++) {
if (!(state & BIT(sas_phy->id)))
continue;
if (!(sas_port->phy_mask & BIT(i)))
continue;
ata_for_each_link(link, ap, EDGE) {
int pmp = sata_srst_pmp(link);
tmf_task.phy_id = sas_phy->id;
tmf_task.phy_id = i;
hisi_sas_fill_ata_reset_cmd(link->device, 1, pmp, fis);
rc = hisi_sas_exec_internal_tmf_task(device, fis, s,
&tmf_task);
if (rc != TMF_RESP_FUNC_COMPLETE) {
dev_err(dev, "phy%d ata reset failed rc=%d\n",
sas_phy->id, rc);
i, rc);
break;
}
}