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scsi: lpfc: Fix SCSI I/O completion and abort handler deadlock
[ Upstream commit 03cbbd7c2f
]
During stress I/O tests with 500+ vports, hard LOCKUP call traces are
observed.
CPU A:
native_queued_spin_lock_slowpath+0x192
_raw_spin_lock_irqsave+0x32
lpfc_handle_fcp_err+0x4c6
lpfc_fcp_io_cmd_wqe_cmpl+0x964
lpfc_sli4_fp_handle_cqe+0x266
__lpfc_sli4_process_cq+0x105
__lpfc_sli4_hba_process_cq+0x3c
lpfc_cq_poll_hdler+0x16
irq_poll_softirq+0x76
__softirqentry_text_start+0xe4
irq_exit+0xf7
do_IRQ+0x7f
CPU B:
native_queued_spin_lock_slowpath+0x5b
_raw_spin_lock+0x1c
lpfc_abort_handler+0x13e
scmd_eh_abort_handler+0x85
process_one_work+0x1a7
worker_thread+0x30
kthread+0x112
ret_from_fork+0x1f
Diagram of lockup:
CPUA CPUB
---- ----
lpfc_cmd->buf_lock
phba->hbalock
lpfc_cmd->buf_lock
phba->hbalock
Fix by reordering the taking of the lpfc_cmd->buf_lock and phba->hbalock in
lpfc_abort_handler routine so that it tries to take the lpfc_cmd->buf_lock
first before phba->hbalock.
Link: https://lore.kernel.org/r/20220412222008.126521-7-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
cc6501afcc
commit
21c0d46934
1 changed files with 15 additions and 18 deletions
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@ -5907,25 +5907,25 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
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if (!lpfc_cmd)
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return ret;
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spin_lock_irqsave(&phba->hbalock, flags);
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/* Guard against IO completion being called at same time */
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spin_lock_irqsave(&lpfc_cmd->buf_lock, flags);
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spin_lock(&phba->hbalock);
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/* driver queued commands are in process of being flushed */
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if (phba->hba_flag & HBA_IOQ_FLUSH) {
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lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
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"3168 SCSI Layer abort requested I/O has been "
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"flushed by LLD.\n");
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ret = FAILED;
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goto out_unlock;
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goto out_unlock_hba;
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}
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/* Guard against IO completion being called at same time */
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spin_lock(&lpfc_cmd->buf_lock);
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if (!lpfc_cmd->pCmd) {
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lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
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"2873 SCSI Layer I/O Abort Request IO CMPL Status "
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"x%x ID %d LUN %llu\n",
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SUCCESS, cmnd->device->id, cmnd->device->lun);
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goto out_unlock_buf;
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goto out_unlock_hba;
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}
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iocb = &lpfc_cmd->cur_iocbq;
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@ -5933,7 +5933,7 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
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pring_s4 = phba->sli4_hba.hdwq[iocb->hba_wqidx].io_wq->pring;
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if (!pring_s4) {
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ret = FAILED;
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goto out_unlock_buf;
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goto out_unlock_hba;
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}
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spin_lock(&pring_s4->ring_lock);
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}
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@ -5966,8 +5966,8 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
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"3389 SCSI Layer I/O Abort Request is pending\n");
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if (phba->sli_rev == LPFC_SLI_REV4)
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spin_unlock(&pring_s4->ring_lock);
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spin_unlock(&lpfc_cmd->buf_lock);
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spin_unlock_irqrestore(&phba->hbalock, flags);
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spin_unlock(&phba->hbalock);
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spin_unlock_irqrestore(&lpfc_cmd->buf_lock, flags);
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goto wait_for_cmpl;
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}
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@ -5988,15 +5988,13 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
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if (ret_val != IOCB_SUCCESS) {
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/* Indicate the IO is not being aborted by the driver. */
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lpfc_cmd->waitq = NULL;
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spin_unlock(&lpfc_cmd->buf_lock);
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spin_unlock_irqrestore(&phba->hbalock, flags);
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ret = FAILED;
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goto out;
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goto out_unlock_hba;
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}
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/* no longer need the lock after this point */
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spin_unlock(&lpfc_cmd->buf_lock);
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spin_unlock_irqrestore(&phba->hbalock, flags);
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spin_unlock(&phba->hbalock);
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spin_unlock_irqrestore(&lpfc_cmd->buf_lock, flags);
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if (phba->cfg_poll & DISABLE_FCP_RING_INT)
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lpfc_sli_handle_fast_ring_event(phba,
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@ -6031,10 +6029,9 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
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out_unlock_ring:
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if (phba->sli_rev == LPFC_SLI_REV4)
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spin_unlock(&pring_s4->ring_lock);
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out_unlock_buf:
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spin_unlock(&lpfc_cmd->buf_lock);
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out_unlock:
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spin_unlock_irqrestore(&phba->hbalock, flags);
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out_unlock_hba:
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spin_unlock(&phba->hbalock);
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spin_unlock_irqrestore(&lpfc_cmd->buf_lock, flags);
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out:
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lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
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"0749 SCSI Layer I/O Abort Request Status x%x ID %d "
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