linux-kernel - Re: [PATCH 1/1] dpt_i2o: delete unnecessary null test on array

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Message-ID: <alpine.DEB.2.02.1408090825250.2016@localhost6.localdomain6>
Date:	Sat, 9 Aug 2014 08:26:04 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	Adaptec OEM Raid Solutions <aacraid@...ptec.com>,
	kernel-janitors@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, joe@...ches.com
Subject: Re: [PATCH 1/1] dpt_i2o: delete unnecessary null test on array

>From nobody Sat Aug  9 08:17:15 CEST 2014
From: Julia Lawall <Julia.Lawall@...6.fr>
To: Adaptec OEM Raid Solutions <aacraid@...ptec.com>
Cc: "James E.J. Bottomley" <JBottomley@...allels.com>,linux-scsi@...r.kernel.org,linux-kernel@...r.kernel.org
Subject: [PATCH] dpt_i2o: delete unnecessary null test on array

From: Julia Lawall <Julia.Lawall@...6.fr>

Convert a NULL test on an array to a NULL test on its element.  Delete a
redundant test and clean up the code a little.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r@
type T;
T [] e;
position p;
@@
e ==@p NULL

@ disable fld_to_ptr@
expression e;
identifier f;
position r.p;
@@
* e.f ==@p NULL
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
v2: Test instead the array element, and clean up the code a bit.

 drivers/scsi/dpt_i2o.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index 67283ef..4647c93 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -1169,15 +1169,14 @@ static struct adpt_device* adpt_find_device(adpt_hba* pHba, u32 chan, u32 id, u6
 	if(chan < 0 || chan >= MAX_CHANNEL)
 		return NULL;
 	
-	if( pHba->channel[chan].device == NULL){
-		printk(KERN_DEBUG"Adaptec I2O RAID: Trying to find device before they are allocated\n");
+	d = pHba->channel[chan].device[id];
+	if (!d) {
+		printk(KERN_DEBUG "Adaptec I2O RAID: Trying to find device before they are allocated\n");
 		return NULL;
 	}
 
-	d = pHba->channel[chan].device[id];
-	if(!d || d->tid == 0) {
+	if (d->tid == 0)
 		return NULL;
-	}
 
 	/* If it is the only lun at that address then this should match*/
 	if(d->scsi_lun == lun){

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