From 54c9dd2d26d0951891516a956893428feb9aea17 Mon Sep 17 00:00:00 2001 From: John Garry Date: Thu, 23 Mar 2017 01:25:29 +0800 Subject: [PATCH] scsi: hisi_sas: fix some sas_task.task_state_lock locking Some more locking needs to be added/modified for when read-modify-writing sas_task.task_state_flags. Note: since we can attempt to grab this lock in interrupt context we should use irq variant of spin_lock. Signed-off-by: John Garry Signed-off-by: Xiang Chen Signed-off-by: Martin K. Petersen --- drivers/scsi/hisi_sas/hisi_sas_main.c | 13 ++++++------- drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 3 +++ drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 7 +++++-- 3 files changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index 49cac22a83bd..f9ea5ccd1e84 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -188,6 +188,7 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_hba *hisi_hba, struct asd_sas_port *sas_port = device->port; struct device *dev = &hisi_hba->pdev->dev; int dlvry_queue_slot, dlvry_queue, n_elem = 0, rc, slot_idx; + unsigned long flags; if (!sas_port) { struct task_status_struct *ts = &task->task_status; @@ -308,9 +309,9 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_hba *hisi_hba, } list_add_tail(&slot->entry, &sas_dev->list); - spin_lock(&task->task_state_lock); + spin_lock_irqsave(&task->task_state_lock, flags); task->task_state_flags |= SAS_TASK_AT_INITIATOR; - spin_unlock(&task->task_state_lock); + spin_unlock_irqrestore(&task->task_state_lock, flags); hisi_hba->slot_prep = slot; @@ -922,14 +923,11 @@ static int hisi_sas_abort_task(struct sas_task *task) return TMF_RESP_FUNC_FAILED; } - spin_lock_irqsave(&task->task_state_lock, flags); if (task->task_state_flags & SAS_TASK_STATE_DONE) { - spin_unlock_irqrestore(&task->task_state_lock, flags); rc = TMF_RESP_FUNC_COMPLETE; goto out; } - spin_unlock_irqrestore(&task->task_state_lock, flags); sas_dev->dev_status = HISI_SAS_DEV_EH; if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SSP) { struct scsi_cmnd *cmnd = task->uldd_task; @@ -1127,6 +1125,7 @@ hisi_sas_internal_abort_task_exec(struct hisi_hba *hisi_hba, u64 device_id, struct asd_sas_port *sas_port = device->port; struct hisi_sas_cmd_hdr *cmd_hdr_base; int dlvry_queue_slot, dlvry_queue, n_elem = 0, rc, slot_idx; + unsigned long flags; if (unlikely(test_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags))) return -EINVAL; @@ -1167,9 +1166,9 @@ hisi_sas_internal_abort_task_exec(struct hisi_hba *hisi_hba, u64 device_id, list_add_tail(&slot->entry, &sas_dev->list); - spin_lock(&task->task_state_lock); + spin_lock_irqsave(&task->task_state_lock, flags); task->task_state_flags |= SAS_TASK_AT_INITIATOR; - spin_unlock(&task->task_state_lock); + spin_unlock_irqrestore(&task->task_state_lock, flags); hisi_hba->slot_prep = slot; diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c index 2f3e87709ac5..fc1c1b2c1a19 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c @@ -1288,6 +1288,7 @@ static int slot_complete_v1_hw(struct hisi_hba *hisi_hba, struct hisi_sas_complete_v1_hdr *complete_queue = hisi_hba->complete_hdr[slot->cmplt_queue]; struct hisi_sas_complete_v1_hdr *complete_hdr; + unsigned long flags; u32 cmplt_hdr_data; complete_hdr = &complete_queue[slot->cmplt_queue_slot]; @@ -1300,9 +1301,11 @@ static int slot_complete_v1_hw(struct hisi_hba *hisi_hba, device = task->dev; sas_dev = device->lldd_dev; + spin_lock_irqsave(&task->task_state_lock, flags); task->task_state_flags &= ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR); task->task_state_flags |= SAS_TASK_STATE_DONE; + spin_unlock_irqrestore(&task->task_state_lock, flags); memset(ts, 0, sizeof(*ts)); ts->resp = SAS_TASK_COMPLETE; diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c index f4d8200ae7e2..2b6e64c953b2 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c @@ -1737,6 +1737,7 @@ slot_complete_v2_hw(struct hisi_hba *hisi_hba, struct hisi_sas_slot *slot) hisi_hba->complete_hdr[slot->cmplt_queue]; struct hisi_sas_complete_v2_hdr *complete_hdr = &complete_queue[slot->cmplt_queue_slot]; + unsigned long flags; int aborted; if (unlikely(!task || !task->lldd_task || !task->dev)) @@ -1746,11 +1747,11 @@ slot_complete_v2_hw(struct hisi_hba *hisi_hba, struct hisi_sas_slot *slot) device = task->dev; sas_dev = device->lldd_dev; - spin_lock(&task->task_state_lock); + spin_lock_irqsave(&task->task_state_lock, flags); aborted = task->task_state_flags & SAS_TASK_STATE_ABORTED; task->task_state_flags &= ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR); - spin_unlock(&task->task_state_lock); + spin_unlock_irqrestore(&task->task_state_lock, flags); memset(ts, 0, sizeof(*ts)); ts->resp = SAS_TASK_COMPLETE; @@ -1849,7 +1850,9 @@ slot_complete_v2_hw(struct hisi_hba *hisi_hba, struct hisi_sas_slot *slot) } out: + spin_lock_irqsave(&task->task_state_lock, flags); task->task_state_flags |= SAS_TASK_STATE_DONE; + spin_unlock_irqrestore(&task->task_state_lock, flags); hisi_sas_slot_task_free(hisi_hba, task, slot); sts = ts->stat; -- 2.39.5