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Petersen (Oracle)" , Sasha Levin Subject: [PATCH 6.6.y 1/3] scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject Date: Fri, 11 Sep 2026 14:21:49 -0400 Message-ID: <20260911182151.1324762-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026090902-deacon-ambiguity-eafe@gregkh> References: <2026090902-deacon-ambiguity-eafe@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Nilesh Javali [ Upstream commit f743488e4a203049f27ec5d8cd0caccc483af01e ] qla_nvme_ls_reject_iocb() allocates from and advances the request ring through __qla2x00_alloc_iocbs() (which assumes the hardware_lock is held) and qla2x00_start_iocbs() (which advances the ring and rings the request-in doorbell), but takes no lock itself. Two of its callers invoke it without the producer lock held: - qla_nvme_xmt_ls_rsp(), the NVMe-FC .xmt_ls_rsp transport callback, on its error path, and - qla2xxx_process_purls_pkt(), run from the purex work/DPC context. Both use ha->base_qpair, whose qp_lock_ptr is hardware_lock, so they can run concurrently with normal I/O submission on the base ring and corrupt the ring producer state, leading to duplicated or dropped commands. The third caller, qla2xxx_process_purls_iocb(), runs inside qla24xx_process_response_queue() with the qpair lock already held and is safe; that is also why the lock cannot be taken inside the helper itself (it would recursively re-acquire hardware_lock on the response path). Take qp_lock_ptr around the two unlocked callers and document the helper as caller-locked. Both run in process context, so spin_lock_irqsave() is used and nothing in the locked region sleeps. Fixes: 875386b98857 ("scsi: qla2xxx: Add Unsolicited LS Request and Response Support for NVMe") Cc: stable@vger.kernel.org Signed-off-by: Nilesh Javali Reviewed-by: Hannes Reinecke Link: https://patch.msgid.link/20260723050413.3897522-53-njavali@marvell.com Signed-off-by: Martin K. Petersen (Oracle) Stable-dep-of: e46160a5d4fa ("scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error") Signed-off-by: Sasha Levin --- drivers/scsi/qla2xxx/qla_nvme.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c index 38cb3281c6350..cfde62464340b 100644 --- a/drivers/scsi/qla2xxx/qla_nvme.c +++ b/drivers/scsi/qla2xxx/qla_nvme.c @@ -375,6 +375,7 @@ static int qla_nvme_xmt_ls_rsp(struct nvme_fc_local_port *lport, srb_t *sp; int rval = QLA_FUNCTION_FAILED; uint8_t cnt = 0; + unsigned long flags; if (!fcport || fcport->deleted) goto out; @@ -441,7 +442,9 @@ static int qla_nvme_xmt_ls_rsp(struct nvme_fc_local_port *lport, a.vp_idx = vha->vp_idx; a.nport_handle = uctx->nport_handle; a.xchg_address = uctx->exchange_address; + spin_lock_irqsave(ha->base_qpair->qp_lock_ptr, flags); qla_nvme_ls_reject_iocb(vha, ha->base_qpair, &a, true); + spin_unlock_irqrestore(ha->base_qpair->qp_lock_ptr, flags); kfree(uctx); return rval; } @@ -1128,6 +1131,10 @@ static void qla_nvme_lsrjt_pt_iocb(struct scsi_qla_host *vha, lsrjt_iocb->rx_byte_count = 0; } +/* + * Allocates from and advances the request ring, so the caller must hold + * qp->qp_lock_ptr (the response-queue caller already holds it). + */ static int qla_nvme_ls_reject_iocb(struct scsi_qla_host *vha, struct qla_qpair *qp, struct qla_nvme_lsrjt_pt_arg *a, bool is_xchg_terminate) @@ -1184,6 +1191,7 @@ qla2xxx_process_purls_pkt(struct scsi_qla_host *vha, struct purex_item *item) { struct qla_nvme_unsol_ctx *uctx = item->purls_context; struct qla_nvme_lsrjt_pt_arg a; + unsigned long flags; int ret = 1; #if (IS_ENABLED(CONFIG_NVME_FC)) @@ -1196,7 +1204,9 @@ qla2xxx_process_purls_pkt(struct scsi_qla_host *vha, struct purex_item *item) a.vp_idx = vha->vp_idx; a.nport_handle = uctx->nport_handle; a.xchg_address = uctx->exchange_address; + spin_lock_irqsave(vha->hw->base_qpair->qp_lock_ptr, flags); qla_nvme_ls_reject_iocb(vha, vha->hw->base_qpair, &a, true); + spin_unlock_irqrestore(vha->hw->base_qpair->qp_lock_ptr, flags); list_del(&uctx->elem); kfree(uctx); } -- 2.53.0