linux-kernel - [PATCH] scsi: qedf: Drop unnecessary NULL checks after container

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Date:   Sun,  9 May 2021 21:12:11 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Saurav Kashyap <skashyap@...vell.com>
Cc:     Javed Hasan <jhasan@...vell.com>,
        GR-QLogic-Storage-Upstream@...vell.com,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH] scsi: qedf: Drop unnecessary NULL checks after container_of

The result of container_of() operations is never NULL unless the embedded
element is the first element of the structure, which is not the case here.
The NULL checks are therefore unnecessary and misleading. Remove them.

The changes in this patch were made automatically using the following
Coccinelle script.

@@
type t;
identifier v;
statement s;
@@

<+...
(
  t v = container_of(...);
|
  v = container_of(...);
)
  ...
  when != v
- if (\( !v \| v == NULL \) ) s
...+>

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/scsi/qedf/qedf_io.c   | 5 -----
 drivers/scsi/qedf/qedf_main.c | 4 ----
 2 files changed, 9 deletions(-)

diff --git a/drivers/scsi/qedf/qedf_io.c b/drivers/scsi/qedf/qedf_io.c
index 4869ef813dc4..6184bc485811 100644
--- a/drivers/scsi/qedf/qedf_io.c
+++ b/drivers/scsi/qedf/qedf_io.c
@@ -23,11 +23,6 @@ static void qedf_cmd_timeout(struct work_struct *work)
 	struct qedf_ctx *qedf;
 	struct qedf_rport *fcport;
 
-	if (io_req == NULL) {
-		QEDF_INFO(NULL, QEDF_LOG_IO, "io_req is NULL.\n");
-		return;
-	}
-
 	fcport = io_req->fcport;
 	if (io_req->fcport == NULL) {
 		QEDF_INFO(NULL, QEDF_LOG_IO,  "fcport is NULL.\n");
diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index 69f7784233f9..9c7efdf40dd5 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -3971,10 +3971,6 @@ void qedf_stag_change_work(struct work_struct *work)
 	struct qedf_ctx *qedf =
 	    container_of(work, struct qedf_ctx, stag_work.work);
 
-	if (!qedf) {
-		QEDF_ERR(NULL, "qedf is NULL");
-		return;
-	}
 	QEDF_ERR(&qedf->dbg_ctx, "Performing software context reset.\n");
 	qedf_ctx_soft_reset(qedf->lport);
 }
-- 
2.25.1