This is a note to let you know that I've just added the patch titled
scsi: iscsi: Add recv workqueue helpers
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-iscsi-add-recv-workqueue-helpers.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 19ff42789bab403696313ddad1e4bd51f408bd07
Author: Mike Christie <michael.christie@xxxxxxxxxx>
Date: Thu Jun 16 17:45:50 2022 -0500
scsi: iscsi: Add recv workqueue helpers
[ Upstream commit 8af809966c0b34cfacd8da9a412689b8e9910354 ]
Add helpers to allow the drivers to run their recv paths from libiscsi's
workqueue.
Link: https://lore.kernel.org/r/20220616224557.115234-3-michael.christie@xxxxxxxxxx
Reviewed-by: Lee Duncan <lduncan@xxxxxxxx>
Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Stable-dep-of: 57569c37f0ad ("scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 1cb18b80d182..73d235540b98 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -93,6 +93,16 @@ inline void iscsi_conn_queue_xmit(struct iscsi_conn *conn)
}
EXPORT_SYMBOL_GPL(iscsi_conn_queue_xmit);
+inline void iscsi_conn_queue_recv(struct iscsi_conn *conn)
+{
+ struct Scsi_Host *shost = conn->session->host;
+ struct iscsi_host *ihost = shost_priv(shost);
+
+ if (ihost->workq && !test_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags))
+ queue_work(ihost->workq, &conn->recvwork);
+}
+EXPORT_SYMBOL_GPL(iscsi_conn_queue_recv);
+
static void __iscsi_update_cmdsn(struct iscsi_session *session,
uint32_t exp_cmdsn, uint32_t max_cmdsn)
{
@@ -1943,7 +1953,7 @@ EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
/**
* iscsi_suspend_tx - suspend iscsi_data_xmit
- * @conn: iscsi conn tp stop processing IO on.
+ * @conn: iscsi conn to stop processing IO on.
*
* This function sets the suspend bit to prevent iscsi_data_xmit
* from sending new IO, and if work is queued on the xmit thread
@@ -1956,7 +1966,7 @@ void iscsi_suspend_tx(struct iscsi_conn *conn)
set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags);
if (ihost->workq)
- flush_workqueue(ihost->workq);
+ flush_work(&conn->xmitwork);
}
EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
@@ -1966,6 +1976,21 @@ static void iscsi_start_tx(struct iscsi_conn *conn)
iscsi_conn_queue_xmit(conn);
}
+/**
+ * iscsi_suspend_rx - Prevent recvwork from running again.
+ * @conn: iscsi conn to stop.
+ */
+void iscsi_suspend_rx(struct iscsi_conn *conn)
+{
+ struct Scsi_Host *shost = conn->session->host;
+ struct iscsi_host *ihost = shost_priv(shost);
+
+ set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
+ if (ihost->workq)
+ flush_work(&conn->recvwork);
+}
+EXPORT_SYMBOL_GPL(iscsi_suspend_rx);
+
/*
* We want to make sure a ping is in flight. It has timed out.
* And we are not busy processing a pdu that is making
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index ffffce144fdb..5cf84228b51d 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -201,6 +201,8 @@ struct iscsi_conn {
struct list_head cmdqueue; /* data-path cmd queue */
struct list_head requeue; /* tasks needing another run */
struct work_struct xmitwork; /* per-conn. xmit workqueue */
+ /* recv */
+ struct work_struct recvwork;
unsigned long flags; /* ISCSI_CONN_FLAGs */
/* negotiated params */
@@ -441,8 +443,10 @@ extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
enum iscsi_param param, char *buf);
extern void iscsi_suspend_tx(struct iscsi_conn *conn);
+extern void iscsi_suspend_rx(struct iscsi_conn *conn);
extern void iscsi_suspend_queue(struct iscsi_conn *conn);
extern void iscsi_conn_queue_xmit(struct iscsi_conn *conn);
+extern void iscsi_conn_queue_recv(struct iscsi_conn *conn);
#define iscsi_conn_printk(prefix, _c, fmt, a...) \
iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
