linux-kernel - Re: [PATCH] scsi: lpfc: Fix buffer free/clear order in deferred receive path

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Message-ID: <CABPRKS_bKK-6ph1ETQ1pLsY_KPPQBnCyBsqfd9V2JrOQXHQT7Q@mail.gmail.com>
Date: Tue, 26 Aug 2025 16:14:34 -0700
From: Justin Tee <justintee8345@...il.com>
To: John Evans <evans1210144@...il.com>
Cc: james.smart@...adcom.com, Justin Tee <justin.tee@...adcom.com>, 
	James.Bottomley@...senpartnership.com, martin.petersen@...cle.com, 
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH] scsi: lpfc: Fix buffer free/clear order in deferred
 receive path

Hi John,

nvmebuf NULL ptr check is already performed earlier in this routine.

Maybe this patch should rather look like:

diff --git a/drivers/scsi/lpfc/lpfc_nvmet.c b/drivers/scsi/lpfc/lpfc_nvmet.c
index fba2e62027b7..cd527324eae7 100644
--- a/drivers/scsi/lpfc/lpfc_nvmet.c
+++ b/drivers/scsi/lpfc/lpfc_nvmet.c
@@ -1264,10 +1264,10 @@ lpfc_nvmet_defer_rcv(struct
nvmet_fc_target_port *tgtport,
                atomic_inc(&tgtp->rcv_fcp_cmd_defer);

        /* Free the nvmebuf since a new buffer already replaced it */
-       nvmebuf->hrq->rqbp->rqb_free_buffer(phba, nvmebuf);
        spin_lock_irqsave(&ctxp->ctxlock, iflag);
        ctxp->rqb_buffer = NULL;
        spin_unlock_irqrestore(&ctxp->ctxlock, iflag);
+       nvmebuf->hrq->rqbp->rqb_free_buffer(phba, nvmebuf);
 }

Regards,
Justin Tee