linux-kernel - [PATCH 2/2] block: sed-opal: fix sparse warning: convert _

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Date:   Wed, 2 Oct 2019 19:23:15 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, axboe <axboe@...nel.dk>
Cc:     Scott Bauer <scott.bauer@...el.com>,
        Rafael Antognolli <rafael.antognolli@...el.com>
Subject: [PATCH 2/2] block: sed-opal: fix sparse warning: convert __be64 data

From: Randy Dunlap <rdunlap@...radead.org>

sparse warns about incorrect type when using __be64 data.
It is not being converted to CPU-endian but it should be.

Fixes these sparse warnings:

../block/sed-opal.c:375:20: warning: incorrect type in assignment (different base types)
../block/sed-opal.c:375:20:    expected unsigned long long [usertype] align
../block/sed-opal.c:375:20:    got restricted __be64 const [usertype] alignment_granularity
../block/sed-opal.c:376:25: warning: incorrect type in assignment (different base types)
../block/sed-opal.c:376:25:    expected unsigned long long [usertype] lowest_lba
../block/sed-opal.c:376:25:    got restricted __be64 const [usertype] lowest_aligned_lba

Fixes: 455a7b238cd6 ("block: Add Sed-opal library")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Scott Bauer <scott.bauer@...el.com>
Cc: Rafael Antognolli <rafael.antognolli@...el.com>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: linux-block@...r.kernel.org
---
If this code is known to work as is, it would be nice to have an
explanation of it.  Oh: maybe it's just that these fields are not
used after they are saved/set.

 block/sed-opal.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- lnx-54-rc1.orig/block/sed-opal.c
+++ lnx-54-rc1/block/sed-opal.c
@@ -372,8 +372,8 @@ static void check_geometry(struct opal_d
 {
 	const struct d0_geometry_features *geo = data;
 
-	dev->align = geo->alignment_granularity;
-	dev->lowest_lba = geo->lowest_aligned_lba;
+	dev->align = be64_to_cpu(geo->alignment_granularity);
+	dev->lowest_lba = be64_to_cpu(geo->lowest_aligned_lba);
 }
 
 static int execute_step(struct opal_dev *dev,