From: Mike Christie michael.christie@oracle.com
[ Upstream commit 0c72191da68638a479602dd515b587ada913184a ]
Drivers shouldn't be calling block/unblock session for cmd cleanup because the functions can change the session state from under libiscsi. This adds a new a driver level bit so it can block all I/O the host while it drains the card.
Link: https://lore.kernel.org/r/20210525181821.7617-26-michael.christie@oracle.com Reviewed-by: Manish Rangankar mrangankar@marvell.com Signed-off-by: Mike Christie michael.christie@oracle.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/qedi/qedi.h | 1 + drivers/scsi/qedi/qedi_iscsi.c | 17 +++++++++++++++-- 2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/qedi/qedi.h b/drivers/scsi/qedi/qedi.h index c342defc3f52..ce199a7a16b8 100644 --- a/drivers/scsi/qedi/qedi.h +++ b/drivers/scsi/qedi/qedi.h @@ -284,6 +284,7 @@ struct qedi_ctx { #define QEDI_IN_RECOVERY 5 #define QEDI_IN_OFFLINE 6 #define QEDI_IN_SHUTDOWN 7 +#define QEDI_BLOCK_IO 8
u8 mac[ETH_ALEN]; u32 src_ip[4]; diff --git a/drivers/scsi/qedi/qedi_iscsi.c b/drivers/scsi/qedi/qedi_iscsi.c index 4acc12111330..5f7e62f19d83 100644 --- a/drivers/scsi/qedi/qedi_iscsi.c +++ b/drivers/scsi/qedi/qedi_iscsi.c @@ -330,12 +330,22 @@ free_conn:
void qedi_mark_device_missing(struct iscsi_cls_session *cls_session) { - iscsi_block_session(cls_session); + struct iscsi_session *session = cls_session->dd_data; + struct qedi_conn *qedi_conn = session->leadconn->dd_data; + + spin_lock_bh(&session->frwd_lock); + set_bit(QEDI_BLOCK_IO, &qedi_conn->qedi->flags); + spin_unlock_bh(&session->frwd_lock); }
void qedi_mark_device_available(struct iscsi_cls_session *cls_session) { - iscsi_unblock_session(cls_session); + struct iscsi_session *session = cls_session->dd_data; + struct qedi_conn *qedi_conn = session->leadconn->dd_data; + + spin_lock_bh(&session->frwd_lock); + clear_bit(QEDI_BLOCK_IO, &qedi_conn->qedi->flags); + spin_unlock_bh(&session->frwd_lock); }
static int qedi_bind_conn_to_iscsi_cid(struct qedi_ctx *qedi, @@ -800,6 +810,9 @@ static int qedi_task_xmit(struct iscsi_task *task) if (test_bit(QEDI_IN_SHUTDOWN, &qedi_conn->qedi->flags)) return -ENODEV;
+ if (test_bit(QEDI_BLOCK_IO, &qedi_conn->qedi->flags)) + return -EACCES; + cmd->state = 0; cmd->task = NULL; cmd->use_slowpath = false;