@@ -709,8 +709,6 @@ static int hisi_sas_init_device(struct domain_device *device)
struct scsi_lun lun;
int retry = HISI_SAS_DISK_RECOVER_CNT;
struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
- struct device *dev = hisi_hba->dev;
- struct sas_phy *local_phy;
switch (device->dev_type) {
case SAS_END_DEVICE:
@@ -729,30 +727,18 @@ static int hisi_sas_init_device(struct domain_device *device)
case SAS_SATA_PM_PORT:
case SAS_SATA_PENDING:
/*
- * send HARD RESET to clear previous affiliation of
- * STP target port
+ * If an expander is swapped when a SATA disk is attached then
+ * we should issue a hard reset to clear previous affiliation
+ * of STP target port, see SPL (chapter 6.19.4).
+ *
+ * However we don't need to issue a hard reset here for these
+ * reasons:
+ * a. When probing the device, libsas/libata already issues a
+ * hard reset in sas_probe_sata() -> ata_sas_async_probe().
+ * Note that in hisi_sas_debug_I_T_nexus_reset() we take care
+ * to issue a hard reset by checking the dev status (== INIT).
+ * b. When resetting the controller, this is simply unnecessary.
*/
- local_phy = sas_get_local_phy(device);
- if (!scsi_is_sas_phy_local(local_phy) &&
- !test_bit(HISI_SAS_RESETTING_BIT, &hisi_hba->flags)) {
- unsigned long deadline = ata_deadline(jiffies, 20000);
- struct sata_device *sata_dev = &device->sata_dev;
- struct ata_host *ata_host = sata_dev->ata_host;
- struct ata_port_operations *ops = ata_host->ops;
- struct ata_port *ap = sata_dev->ap;
- struct ata_link *link;
- unsigned int classes;
-
- ata_for_each_link(link, ap, EDGE)
- rc = ops->hardreset(link, &classes,
- deadline);
- }
- sas_put_local_phy(local_phy);
- if (rc) {
- dev_warn(dev, "SATA disk hardreset fail: %d\n", rc);
- return rc;
- }
-
while (retry-- > 0) {
rc = hisi_sas_softreset_ata_disk(device);
if (!rc)
@@ -768,15 +754,19 @@ static int hisi_sas_init_device(struct domain_device *device)
int hisi_sas_slave_alloc(struct scsi_device *sdev)
{
- struct domain_device *ddev;
+ struct domain_device *ddev = sdev_to_domain_dev(sdev);
+ struct hisi_sas_device *sas_dev = ddev->lldd_dev;
int rc;
rc = sas_slave_alloc(sdev);
if (rc)
return rc;
- ddev = sdev_to_domain_dev(sdev);
- return hisi_sas_init_device(ddev);
+ rc = hisi_sas_init_device(ddev);
+ if (rc)
+ return rc;
+ sas_dev->dev_status = HISI_SAS_DEV_NORMAL;
+ return 0;
}
EXPORT_SYMBOL_GPL(hisi_sas_slave_alloc);
@@ -826,7 +816,6 @@ static int hisi_sas_dev_found(struct domain_device *device)
dev_info(dev, "dev[%d:%x] found\n",
sas_dev->device_id, sas_dev->dev_type);
- sas_dev->dev_status = HISI_SAS_DEV_NORMAL;
return 0;
err_out:
Removing an ATA device via sysfs means that the device may not be found through re-scanning: root@ubuntu:/home/john# lsscsi [0:0:0:0] disk SanDisk LT0200MO P404 /dev/sda [0:0:1:0] disk ATA HGST HUS724040AL A8B0 /dev/sdb [0:0:8:0] enclosu 12G SAS Expander RevB - root@ubuntu:/home/john# echo 1 > /sys/block/sdb/device/delete root@ubuntu:/home/john# echo "- - -" > /sys/class/scsi_host/host0/scan root@ubuntu:/home/john# lsscsi [0:0:0:0] disk SanDisk LT0200MO P404 /dev/sda [0:0:8:0] enclosu 12G SAS Expander RevB - root@ubuntu:/home/john# The problem is that the rescan of the device may conflict with the device in being re-initialized, as follows: - In the rescan we call hisi_sas_slave_alloc() in store_scan() -> sas_user_scan() -> [__]scsi_scan_target() -> scsi_probe_and_add_lunc() -> scsi_alloc_sdev() -> hisi_sas_slave_alloc() -> hisi_sas_init_device() In hisi_sas_init_device() we issue an IT nexus reset for ATA devices - That IT nexus causes the remote PHY to go down and this triggers a bcast event - In parallel libsas processes the bcast event, finds that the phy is down and marks the device as gone The hard reset issued in hisi_sas_init_device() is unncessary - as described in the code comment - so remove it. Also set dev status as HISI_SAS_DEV_NORMAL as the hisi_sas_init_device() call. Fixes: 36c6b7613ef1 ("scsi: hisi_sas: Initialise devices in .slave_alloc callback") Signed-off-by: John Garry <john.garry@huawei.com> Tested-by: Yihang Li <liyihang6@hisilicon.com> Reviewed-by: Xiang Chen <chenxiang66@hisilicon.com> --- drivers/scsi/hisi_sas/hisi_sas_main.c | 47 ++++++++++----------------- 1 file changed, 18 insertions(+), 29 deletions(-)