linux-kernel - [PATCH] scsi: aic7xxx: Remove unnecessary NULL checks before kfree

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Date:   Fri,  3 Apr 2020 17:47:11 +0100
From:   Alex Dewar <alex.dewar@....co.uk>
To:     alex.dewar@....co.uk
Cc:     Hannes Reinecke <hare@...e.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
Subject: [PATCH] scsi: aic7xxx: Remove unnecessary NULL checks before kfree

There are a number of places in the aic7xxx driver where a NULL check is
performed before a kfree(). However, kfree() already performs NULL checks
so this is unnecessary. Remove the checks.

Issue identified with Coccinelle.

Signed-off-by: Alex Dewar <alex.dewar@....co.uk>
---
 drivers/scsi/aic7xxx/aic79xx_core.c | 15 +++++----------
 drivers/scsi/aic7xxx/aic7xxx_core.c | 15 +++++----------
 2 files changed, 10 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/aic7xxx/aic79xx_core.c b/drivers/scsi/aic7xxx/aic79xx_core.c
index a336a458c978..72eaad4aef9c 100644
--- a/drivers/scsi/aic7xxx/aic79xx_core.c
+++ b/drivers/scsi/aic7xxx/aic79xx_core.c
@@ -3662,8 +3662,7 @@ ahd_free_tstate(struct ahd_softc *ahd, u_int scsi_id, char channel, int force)
 		return;

 	tstate = ahd->enabled_targets[scsi_id];
-	if (tstate != NULL)
-		kfree(tstate);
+	kfree(tstate);
 	ahd->enabled_targets[scsi_id] = NULL;
 }
 #endif
@@ -6120,8 +6119,7 @@ ahd_set_unit(struct ahd_softc *ahd, int unit)
 void
 ahd_set_name(struct ahd_softc *ahd, char *name)
 {
-	if (ahd->name != NULL)
-		kfree(ahd->name);
+	kfree(ahd->name);
 	ahd->name = name;
 }

@@ -6182,12 +6180,9 @@ ahd_free(struct ahd_softc *ahd)
 		kfree(ahd->black_hole);
 	}
 #endif
-	if (ahd->name != NULL)
-		kfree(ahd->name);
-	if (ahd->seep_config != NULL)
-		kfree(ahd->seep_config);
-	if (ahd->saved_stack != NULL)
-		kfree(ahd->saved_stack);
+	kfree(ahd->name);
+	kfree(ahd->seep_config);
+	kfree(ahd->saved_stack);
 	kfree(ahd);
 	return;
 }
diff --git a/drivers/scsi/aic7xxx/aic7xxx_core.c b/drivers/scsi/aic7xxx/aic7xxx_core.c
index 84fc499cb1e6..5a10feea17fe 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_core.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_core.c
@@ -2178,8 +2178,7 @@ ahc_free_tstate(struct ahc_softc *ahc, u_int scsi_id, char channel, int force)
 	if (channel == 'B')
 		scsi_id += 8;
 	tstate = ahc->enabled_targets[scsi_id];
-	if (tstate != NULL)
-		kfree(tstate);
+	kfree(tstate);
 	ahc->enabled_targets[scsi_id] = NULL;
 }
 #endif
@@ -4453,8 +4452,7 @@ ahc_set_unit(struct ahc_softc *ahc, int unit)
 void
 ahc_set_name(struct ahc_softc *ahc, char *name)
 {
-	if (ahc->name != NULL)
-		kfree(ahc->name);
+	kfree(ahc->name);
 	ahc->name = name;
 }

@@ -4515,10 +4513,8 @@ ahc_free(struct ahc_softc *ahc)
 		kfree(ahc->black_hole);
 	}
 #endif
-	if (ahc->name != NULL)
-		kfree(ahc->name);
-	if (ahc->seep_config != NULL)
-		kfree(ahc->seep_config);
+	kfree(ahc->name);
+	kfree(ahc->seep_config);
 	kfree(ahc);
 	return;
 }
@@ -4927,8 +4923,7 @@ ahc_fini_scbdata(struct ahc_softc *ahc)
 	case 0:
 		break;
 	}
-	if (scb_data->scbarray != NULL)
-		kfree(scb_data->scbarray);
+	kfree(scb_data->scbarray);
 }

 static void
--
2.26.0