linux-kernel - [PATCH] Input: cyapa - Remove superfluous type check in cyapa_gen5_read_idac

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Date:	Thu, 12 Feb 2015 15:16:13 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Dudley Du <dudl@...ress.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] Input: cyapa - Remove superfluous type check in cyapa_gen5_read_idac_data()

drivers/input/mouse/cyapa_gen5.c: In function ‘cyapa_gen5_read_idac_data’:
drivers/input/mouse/cyapa_gen5.c:1876: warning: ‘max_element_cnt’ may be used uninitialized in this function
drivers/input/mouse/cyapa_gen5.c:1873: warning: ‘offset’ may be used uninitialized in this function

If *data_size is non-zero, and idac_data_type contains an unknown type,
max_element_cnt and offset will be uninitialized, and the loop will
process non-existing data.

However, this cannot happen (for now), as there's a test for unknown
types at the top of cyapa_gen5_read_idac_data().

As no "if ... else if ..." is used in other places, remove the
superfluous "if" to silence the compiler warning.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
Alternatively, we can pre-initialize max_element_cnt and offset to zero,
and add "if (!max_element_cnt) goto out;" before the loop.

 drivers/input/mouse/cyapa_gen5.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/mouse/cyapa_gen5.c b/drivers/input/mouse/cyapa_gen5.c
index ddf5393a118098fc..88c465b70e9d8776 100644
--- a/drivers/input/mouse/cyapa_gen5.c
+++ b/drivers/input/mouse/cyapa_gen5.c
@@ -1926,7 +1926,7 @@ static int cyapa_gen5_read_idac_data(struct cyapa *cyapa,
 				electrodes_tx = cyapa->electrodes_x;
 			max_element_cnt = ((cyapa->aligned_electrodes_rx + 7) &
 						~7u) * electrodes_tx;
-		} else if (idac_data_type == GEN5_RETRIEVE_SELF_CAP_PWC_DATA) {
+		} else {
 			offset = 2;
 			max_element_cnt = cyapa->electrodes_x +
 						cyapa->electrodes_y;
-- 
1.9.1

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