linux-kernel - RE: [patch 2/2] [SCSI] bfa: test is always false in bfa_sfp_media

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Date:	Mon, 11 Jul 2011 23:54:46 -0700
From:	Jing Huang <huangj@...cade.COM>
To:	Dan Carpenter <error27@...il.com>
CC:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	"open list:BROCADE BFA FC SC..." <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	Krishna Gudipati <kgudipat@...cade.com>
Subject: RE: [patch 2/2] [SCSI] bfa: test is always false in
 bfa_sfp_media_get()

>-----Original Message-----
>From: Dan Carpenter [mailto:error27@...il.com]
>Sent: Wednesday, July 06, 2011 12:40 AM
>To: Jing Huang
>Cc: James E.J. Bottomley; open list:BROCADE BFA FC SC...; linux-
>kernel@...r.kernel.org; kernel-janitors@...r.kernel.org
>Subject: [patch 2/2] [SCSI] bfa: test is always false in bfa_sfp_media_get()
>
>e10g.r.e10g_unall is only 1 bit so "if (e10g.r.e10g_unall & 0x80)"
>is always false.  e10g is a union between an unsigned char and named
>bitfields.  The intent here was to test the named bitfield by
>itself.
>
>We can change the previous tests as well.  That improves the
>readability and it looks like it fixes a endian bug as well.
>
>Signed-off-by: Dan Carpenter <error27@...il.com>
>---
>I don't understand where __BIGENDIAN is defined.  Only this driver
>references it.  How does that work?
>
>diff --git a/drivers/scsi/bfa/bfa_ioc.c b/drivers/scsi/bfa/bfa_ioc.c
>index 052373b..090a19d 100644
>--- a/drivers/scsi/bfa/bfa_ioc.c
>+++ b/drivers/scsi/bfa/bfa_ioc.c
>@@ -3589,11 +3589,11 @@ bfa_sfp_media_get(struct bfa_sfp_s *sfp)
> 			 (xmtr_tech & SFP_XMTR_TECH_SA))
> 			*media = BFA_SFP_MEDIA_SW;
> 		/* Check 10G Ethernet Compilance code */
>-		else if (e10g.b & 0x10)
>+		else if (e10g.r.e10g_sr)
> 			*media = BFA_SFP_MEDIA_SW;
>-		else if (e10g.b & 0x60)
>+		else if (e10g.r.e10g_lr && e10g.r.e10g_lrm)
> 			*media = BFA_SFP_MEDIA_LW;
>-		else if (e10g.r.e10g_unall & 0x80)
>+		else if (e10g.r.e10g_unall)
> 			*media = BFA_SFP_MEDIA_UNKNOWN;
> 		else
> 			bfa_trc(sfp, 0);

Hi Dan,

__BIGENIDIAN is a bug and it needs to be replaced with __BIG_ENDIAN.
The first two changes will introduce endianness issue without having __BIGENDIAN fixed.
The third change is good but also needs the same fix to make the code endianness netural,.

Thanks
Jing
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