From 943b0f0e08cc13da5a37263ed538fd3a8496b731 Mon Sep 17 00:00:00 2001
From: Xiaofei Tan <tanxiaofei@huawei.com>
Date: Tue, 24 Oct 2017 23:51:47 +0800
Subject: [PATCH 30/33] scsi: hisi_sas: complete all tasklets prior to host
reset
Git-commit: 571295f8055c0b69c9911021ae6cf1a6973cf517
Patch-mainline: v4.15-rc1
References: bsc#1071401
The CQ event is handled in tasklet context, and it could be delayed if
the system loading is high.
It is possible to run into some problems when executing a host reset
when cq_tasklet_vx_hw() is being executed.
So, prior to host reset, execute tasklet_kill() to ensure that all CQ
tasklets are complete.
Besides, as the function hisi_sas_wait_tasklets_done() is added to do
tasklet_kill(), this patch refactors some code where tasklet_kill() is
used.
Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/scsi/hisi_sas/hisi_sas.h | 1 +
drivers/scsi/hisi_sas/hisi_sas_main.c | 11 +++++++++++
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 8 ++------
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 3 ++-
4 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index c65d151411e0..c5fd545030e2 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -426,4 +426,5 @@ extern void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba,
struct hisi_sas_slot *slot);
extern void hisi_sas_init_mem(struct hisi_hba *hisi_hba);
extern void hisi_sas_rst_work_handler(struct work_struct *work);
+extern void hisi_sas_kill_tasklets(struct hisi_hba *hisi_hba);
#endif
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 1d417a4138f2..4cbb9992cb88 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -1548,6 +1548,17 @@ void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy)
}
EXPORT_SYMBOL_GPL(hisi_sas_phy_down);
+void hisi_sas_kill_tasklets(struct hisi_hba *hisi_hba)
+{
+ int i;
+
+ for (i = 0; i < hisi_hba->queue_count; i++) {
+ struct hisi_sas_cq *cq = &hisi_hba->cq[i];
+
+ tasklet_kill(&cq->tasklet);
+ }
+}
+EXPORT_SYMBOL_GPL(hisi_sas_kill_tasklets);
struct scsi_transport_template *hisi_sas_stt;
EXPORT_SYMBOL_GPL(hisi_sas_stt);
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index ee34f2ef1ae6..4a740da85549 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -3375,6 +3375,7 @@ static int soft_reset_v2_hw(struct hisi_hba *hisi_hba)
interrupt_disable_v2_hw(hisi_hba);
hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE, 0x0);
+ hisi_sas_kill_tasklets(hisi_hba);
hisi_sas_stop_phys(hisi_hba);
@@ -3458,16 +3459,11 @@ static int hisi_sas_v2_remove(struct platform_device *pdev)
{
struct sas_ha_struct *sha = platform_get_drvdata(pdev);
struct hisi_hba *hisi_hba = sha->lldd_ha;
- int i;
if (timer_pending(&hisi_hba->timer))
del_timer(&hisi_hba->timer);
- for (i = 0; i < hisi_hba->queue_count; i++) {
- struct hisi_sas_cq *cq = &hisi_hba->cq[i];
-
- tasklet_kill(&cq->tasklet);
- }
+ hisi_sas_kill_tasklets(hisi_hba);
return hisi_sas_remove(pdev);
}
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 243fa1d5772e..18cc3b41ae8d 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -1768,6 +1768,7 @@ static int soft_reset_v3_hw(struct hisi_hba *hisi_hba)
interrupt_disable_v3_hw(hisi_hba);
hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE, 0x0);
+ hisi_sas_kill_tasklets(hisi_hba);
hisi_sas_stop_phys(hisi_hba);
@@ -1977,7 +1978,6 @@ hisi_sas_v3_destroy_irqs(struct pci_dev *pdev, struct hisi_hba *hisi_hba)
struct hisi_sas_cq *cq = &hisi_hba->cq[i];
free_irq(pci_irq_vector(pdev, i+16), cq);
- tasklet_kill(&cq->tasklet);
}
pci_free_irq_vectors(pdev);
}
@@ -1993,6 +1993,7 @@ static void hisi_sas_v3_remove(struct pci_dev *pdev)
sas_remove_host(sha->core.shost);
hisi_sas_v3_destroy_irqs(pdev, hisi_hba);
+ hisi_sas_kill_tasklets(hisi_hba);
pci_release_regions(pdev);
pci_disable_device(pdev);
hisi_sas_free(hisi_hba);
--
2.11.0