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From cc9cd21f1c1e14fa5b2b3129f505447bc3be9283 Mon Sep 17 00:00:00 2001
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From: Himanshu Madhani <hmadhani@redhat.com>
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Date: Thu, 1 Aug 2019 15:55:58 -0400
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Subject: [PATCH 098/124] [scsi] scsi: qla2xxx: Complain loudly about reference
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count underflow
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Message-id: <20190801155618.12650-99-hmadhani@redhat.com>
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Patchwork-id: 267873
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O-Subject: [RHEL 7.8 e-stor PATCH 098/118] scsi: qla2xxx: Complain loudly about reference count underflow
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Bugzilla: 1729270
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RH-Acked-by: Jarod Wilson <jarod@redhat.com>
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RH-Acked-by: Tony Camuso <tcamuso@redhat.com>
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From: Bart Van Assche <bvanassche@acm.org>
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Bugzilla 1729270
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A reference count underflow is a severe bug. Hence complain loudly if a
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reference count underflow happens.
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Cc: Himanshu Madhani <hmadhani@marvell.com>
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Cc: Giridhar Malavali <gmalavali@marvell.com>
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Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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Acked-by: Himanshu Madhani <hmadhani@marvell.com>
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Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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(cherry picked from commit db4bf822c58cd2b4a6718c982ce48a5292f5cc6a)
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Signed-off-by: Himanshu Madhani <hmadhani@redhat.com>
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Signed-off-by: Jan Stancek <jstancek@redhat.com>
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---
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drivers/scsi/qla2xxx/qla_nvme.c | 15 +++++----------
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drivers/scsi/qla2xxx/qla_os.c | 16 ++--------------
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2 files changed, 7 insertions(+), 24 deletions(-)
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diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
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index 8ddd44bb6c7f..dea081c27182 100644
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--- a/drivers/scsi/qla2xxx/qla_nvme.c
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+++ b/drivers/scsi/qla2xxx/qla_nvme.c
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@@ -131,11 +131,8 @@ static void qla_nvme_sp_ls_done(void *ptr, int res)
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struct nvmefc_ls_req *fd;
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struct nvme_private *priv;
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- if (atomic_read(&sp->ref_count) == 0) {
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- ql_log(ql_log_warn, sp->fcport->vha, 0x2123,
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- "SP reference-count to ZERO on LS_done -- sp=%p.\n", sp);
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+ if (WARN_ON_ONCE(atomic_read(&sp->ref_count) == 0))
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return;
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- }
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atomic_dec(&sp->ref_count);
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@@ -160,6 +157,9 @@ static void qla_nvme_sp_done(void *ptr, int res)
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nvme = &sp->u.iocb_cmd;
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fd = nvme->u.nvme.desc;
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+ if (WARN_ON_ONCE(atomic_read(&sp->ref_count) == 0))
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+ return;
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+
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atomic_dec(&sp->ref_count);
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if (res == QLA_SUCCESS) {
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@@ -199,13 +199,8 @@ static void qla_nvme_abort_work(struct work_struct *work)
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return;
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}
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- if (atomic_read(&sp->ref_count) == 0) {
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- WARN_ON(1);
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- ql_log(ql_log_info, fcport->vha, 0xffff,
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- "%s: command already aborted on sp: %p\n",
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- __func__, sp);
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+ if (WARN_ON_ONCE(atomic_read(&sp->ref_count) == 0))
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return;
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- }
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rval = ha->isp_ops->abort_command(sp);
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diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
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index a32074dd4727..a3159a9a4c3e 100644
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--- a/drivers/scsi/qla2xxx/qla_os.c
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+++ b/drivers/scsi/qla2xxx/qla_os.c
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@@ -762,14 +762,8 @@ qla2x00_sp_compl(void *ptr, int res)
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struct scsi_cmnd *cmd = GET_CMD_SP(sp);
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struct completion *comp = sp->comp;
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- if (atomic_read(&sp->ref_count) == 0) {
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- ql_dbg(ql_dbg_io, sp->vha, 0x3015,
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- "SP reference-count to ZERO -- sp=%p cmd=%p.\n",
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- sp, GET_CMD_SP(sp));
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- if (ql2xextended_error_logging & ql_dbg_io)
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- WARN_ON(atomic_read(&sp->ref_count) == 0);
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+ if (WARN_ON_ONCE(atomic_read(&sp->ref_count) == 0))
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return;
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- }
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atomic_dec(&sp->ref_count);
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@@ -872,14 +866,8 @@ qla2xxx_qpair_sp_compl(void *ptr, int res)
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struct scsi_cmnd *cmd = GET_CMD_SP(sp);
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struct completion *comp = sp->comp;
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- if (atomic_read(&sp->ref_count) == 0) {
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- ql_dbg(ql_dbg_io, sp->fcport->vha, 0x3079,
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- "SP reference-count to ZERO -- sp=%p cmd=%p.\n",
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- sp, GET_CMD_SP(sp));
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- if (ql2xextended_error_logging & ql_dbg_io)
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- WARN_ON(atomic_read(&sp->ref_count) == 0);
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+ if (WARN_ON_ONCE(atomic_read(&sp->ref_count) == 0))
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return;
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- }
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atomic_dec(&sp->ref_count);
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--
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2.13.6
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