linux-kernel - [PATCH 2/2] staging: rts5208: Simplify boolean expression to improve code style

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Message-Id: <20190626142857.30155-3-tobias.niessen@stud.uni-hannover.de>
Date:   Wed, 26 Jun 2019 16:28:57 +0200
From:   Tobias Nießen 
        <tobias.niessen@...d.uni-hannover.de>
To:     gregkh@...uxfoundation.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux-kernel@...cs.fau.de,
        Tobias Nießen 
        <tobias.niessen@...d.uni-hannover.de>,
        Sabrina Gaube <sabrina-gaube@....de>
Subject: [PATCH 2/2] staging: rts5208: Simplify boolean expression to improve code style

This bitwisen / boolean expression can be made more readable while
reducing the line lengths at the same time. This commit uses the
fact that

    a & (b | c) == (b | c)

evaluates to true if and only if

    (a & b) && (a & c)

is true. Since b and c are constants with relatively long names,
using the second form makes the code much more readable and shorter.

Signed-off-by: Tobias Nießen <tobias.niessen@...d.uni-hannover.de>
Signed-off-by: Sabrina Gaube <sabrina-gaube@....de>
---
 drivers/staging/rts5208/xd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/rts5208/xd.c b/drivers/staging/rts5208/xd.c
index c5ee04ecd1c9..f3dc96a4c59d 100644
--- a/drivers/staging/rts5208/xd.c
+++ b/drivers/staging/rts5208/xd.c
@@ -1155,10 +1155,10 @@ static int xd_copy_page(struct rtsx_chip *chip, u32 old_blk, u32 new_blk,
 					return STATUS_FAIL;
 				}
 
-				if (((reg & (XD_ECC1_ERROR | XD_ECC1_UNCORRECTABLE)) ==
-						(XD_ECC1_ERROR | XD_ECC1_UNCORRECTABLE)) ||
-					((reg & (XD_ECC2_ERROR | XD_ECC2_UNCORRECTABLE)) ==
-						(XD_ECC2_ERROR | XD_ECC2_UNCORRECTABLE))) {
+				if (((reg & XD_ECC1_ERROR) &&
+				     (reg & XD_ECC1_UNCORRECTABLE)) ||
+				    ((reg & XD_ECC2_ERROR) &&
+				     (reg & XD_ECC2_UNCORRECTABLE))) {
 					rtsx_write_register(chip,
 							    XD_PAGE_STATUS,
 							    0xFF,
-- 
2.17.0