From 4645f7b56a9fc3fb16605a1bfa10d884fcd5226c Mon Sep 17 00:00:00 2001 From: James Smart Date: Tue, 12 Mar 2019 16:30:14 -0700 Subject: [PATCH] scsi: lpfc: Coordinate adapter error handling with offline handling The driver periodically checks for adapter error in a background thread. If the thread detects an error, the adapter will be reset including the deletion and reallocation of workqueues on the adapter. Simultaneously, there may be a user-space request to offline the adapter which may try to do many of the same steps, in parallel, on a different thread. As memory was deallocated while unexpected, the parallel offline request hit a bad pointer. Add coordination between the two threads. The error recovery thread has precedence. So, when an error is detected, a flag is set on the adapter to indicate the error thread is terminating the adapter. But, before doing that work, it will look for a flag that is set by the offline flow, and if set, will wait for it to complete before then processing the error handling path. Similarly, in the offline thread, it first checks for whether the error thread is resetting the adapter, and if so, will then wait for the error thread to finish. Only after it has finished, will it set its flag and offline the adapter. Signed-off-by: Dick Kennedy Signed-off-by: James Smart Signed-off-by: Martin K. Petersen --- drivers/scsi/lpfc/lpfc_attr.c | 19 +++++++++++++++++++ drivers/scsi/lpfc/lpfc_init.c | 19 +++++++++++++++++++ drivers/scsi/lpfc/lpfc_sli.c | 6 +++--- drivers/scsi/lpfc/lpfc_sli.h | 4 ++++ 4 files changed, 45 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c index 5d6c874c44e7..61745f590916 100644 --- a/drivers/scsi/lpfc/lpfc_attr.c +++ b/drivers/scsi/lpfc/lpfc_attr.c @@ -1204,6 +1204,20 @@ lpfc_do_offline(struct lpfc_hba *phba, uint32_t type) psli = &phba->sli; + /* + * If freeing the queues have already started, don't access them. + * Otherwise set FREE_WAIT to indicate that queues are being used + * to hold the freeing process until we finish. + */ + spin_lock_irq(&phba->hbalock); + if (!(psli->sli_flag & LPFC_QUEUE_FREE_INIT)) { + psli->sli_flag |= LPFC_QUEUE_FREE_WAIT; + } else { + spin_unlock_irq(&phba->hbalock); + goto skip_wait; + } + spin_unlock_irq(&phba->hbalock); + /* Wait a little for things to settle down, but not * long enough for dev loss timeout to expire. */ @@ -1225,6 +1239,11 @@ lpfc_do_offline(struct lpfc_hba *phba, uint32_t type) } } out: + spin_lock_irq(&phba->hbalock); + psli->sli_flag &= ~LPFC_QUEUE_FREE_WAIT; + spin_unlock_irq(&phba->hbalock); + +skip_wait: init_completion(&online_compl); rc = lpfc_workq_post_event(phba, &status, &online_compl, type); if (rc == 0) diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 4644cea2e5ce..05fbb4765d70 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -9135,6 +9135,20 @@ lpfc_sli4_release_hdwq(struct lpfc_hba *phba) void lpfc_sli4_queue_destroy(struct lpfc_hba *phba) { + /* + * Set FREE_INIT before beginning to free the queues. + * Wait until the users of queues to acknowledge to + * release queues by clearing FREE_WAIT. + */ + spin_lock_irq(&phba->hbalock); + phba->sli.sli_flag |= LPFC_QUEUE_FREE_INIT; + while (phba->sli.sli_flag & LPFC_QUEUE_FREE_WAIT) { + spin_unlock_irq(&phba->hbalock); + msleep(20); + spin_lock_irq(&phba->hbalock); + } + spin_unlock_irq(&phba->hbalock); + /* Release HBA eqs */ if (phba->sli4_hba.hdwq) lpfc_sli4_release_hdwq(phba); @@ -9173,6 +9187,11 @@ lpfc_sli4_queue_destroy(struct lpfc_hba *phba) /* Everything on this list has been freed */ INIT_LIST_HEAD(&phba->sli4_hba.lpfc_wq_list); + + /* Done with freeing the queues */ + spin_lock_irq(&phba->hbalock); + phba->sli.sli_flag &= ~LPFC_QUEUE_FREE_INIT; + spin_unlock_irq(&phba->hbalock); } int diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 32ded3e9b32e..4b084a408e71 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -14417,6 +14417,9 @@ lpfc_sli4_queue_free(struct lpfc_queue *queue) if (!queue) return; + if (!list_empty(&queue->wq_list)) + list_del(&queue->wq_list); + while (!list_empty(&queue->page_list)) { list_remove_head(&queue->page_list, dmabuf, struct lpfc_dmabuf, list); @@ -14432,9 +14435,6 @@ lpfc_sli4_queue_free(struct lpfc_queue *queue) if (!list_empty(&queue->cpu_list)) list_del(&queue->cpu_list); - if (!list_empty(&queue->wq_list)) - list_del(&queue->wq_list); - kfree(queue); return; } diff --git a/drivers/scsi/lpfc/lpfc_sli.h b/drivers/scsi/lpfc/lpfc_sli.h index 1153a6c91bde..467b8270f7fd 100644 --- a/drivers/scsi/lpfc/lpfc_sli.h +++ b/drivers/scsi/lpfc/lpfc_sli.h @@ -327,6 +327,10 @@ struct lpfc_sli { #define LPFC_SLI_ASYNC_MBX_BLK 0x2000 /* Async mailbox is blocked */ #define LPFC_SLI_SUPPRESS_RSP 0x4000 /* Suppress RSP feature is supported */ #define LPFC_SLI_USE_EQDR 0x8000 /* EQ Delay Register is supported */ +#define LPFC_QUEUE_FREE_INIT 0x10000 /* Queue freeing is in progress */ +#define LPFC_QUEUE_FREE_WAIT 0x20000 /* Hold Queue free as it is being + * used outside worker thread + */ struct lpfc_sli_ring *sli3_ring; -- 2.30.2