linux-kernel - [PATCH 4.15 069/128] power: supply: sbs-message: double left shift bug in sbsm

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Date:   Fri, 16 Mar 2018 16:23:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.15 069/128] power: supply: sbs-message: double left shift bug in sbsm_select()

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>


[ Upstream commit 7d54d0d38ec42559c891526f079f1e035cd4b3ae ]

The original code does this: "1 << (1 << 11)" which is undefined in C.

Fixes: dbc4deda03fe ("power: Adds support for Smart Battery System Manager")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/power/supply/sbs-manager.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/power/supply/sbs-manager.c
+++ b/drivers/power/supply/sbs-manager.c
@@ -183,7 +183,7 @@ static int sbsm_select(struct i2c_mux_co
 		return ret;
 
 	/* chan goes from 1 ... 4 */
-	reg = 1 << BIT(SBSM_SMB_BAT_OFFSET + chan);
+	reg = BIT(SBSM_SMB_BAT_OFFSET + chan);
 	ret = sbsm_write_word(data->client, SBSM_CMD_BATSYSSTATE, reg);
 	if (ret)
 		dev_err(dev, "Failed to select channel %i\n", chan);