linux-kernel - [PATCH] sysfs: return correct error code on unimplemented mmap()

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Date:	Mon, 28 Oct 2013 18:28:30 +0200
From:	Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] sysfs: return correct error code on unimplemented mmap()

Both POSIX.1-2008 and Linux Programmer's Manual have a dedicated return
error code for a case, when a file doesn't support mmap(), it's ENODEV.

This change replaces overloaded EINVAL with ENODEV in a situation
described above for sysfs binary files.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/sysfs/bin.c |    1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index c590cab..d37433c 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -350,7 +350,6 @@ static int mmap(struct file *file, struct vm_area_struct *vma)
 	if (!sysfs_get_active(attr_sd))
 		goto out_unlock;
 
-	rc = -EINVAL;
 	if (!attr->mmap)
 		goto out_put;
 
-- 
1.7.10.4

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