From: lee.jones@linaro.org (Lee Jones)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 11/11] mfd: sm501: Avoid implicit sign extension
Date: Thu, 28 Aug 2014 14:14:17 +0100 [thread overview]
Message-ID: <1409231657-18294-11-git-send-email-lee.jones@linaro.org> (raw)
In-Reply-To: <1409231657-18294-1-git-send-email-lee.jones@linaro.org>
Suspicious implicit sign extension where 'reg' (unsigned char) is
promoted in reg << clksrc to int, then sign-extended to unsigned
long. If reg << clksrc is greater than 0x7FFFFFFF, the upper bits
of the result will all be 1.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mfd/sm501.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index 81e6d09..1f9233b 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -514,9 +514,9 @@ unsigned long sm501_set_clock(struct device *dev,
unsigned long mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
unsigned long gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
unsigned long clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
- unsigned char reg;
unsigned int pll_reg = 0;
unsigned long sm501_freq; /* the actual frequency achieved */
+ u64 reg;
struct sm501_clock to;
--
1.9.1
next prev parent reply other threads:[~2014-08-28 13:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-28 13:14 [PATCH 01/11] iio: sensors-core: st: Check st_sensors_set_drdy_int_pin()'s return value Lee Jones
2014-08-28 13:14 ` [PATCH 02/11] misc: st_core: Protect unsigned value against becoming negative Lee Jones
2014-08-28 13:14 ` [PATCH 03/11] misc: st_kim: Increase size of dev_name buffer to incorporate termination Lee Jones
2014-08-28 13:14 ` [PATCH 04/11] mfd: htc-i2cpld: container_of() cannot return NULL Lee Jones
2014-08-28 13:14 ` [PATCH 05/11] mfd: htc-i2cpld: Use '!variable' instead of 'variable == NULL' Lee Jones
2014-08-28 13:14 ` [PATCH 06/11] mfd: htc-i2cpld: Rectify pointer offset error Lee Jones
2014-08-28 13:14 ` [PATCH 07/11] mfd: wm5102: Insert missing break in case statement Lee Jones
2014-08-28 13:14 ` [PATCH 08/11] mfd: max77686: Remove check which is always true Lee Jones
2014-08-28 13:14 ` [PATCH 09/11] mfd: pcf50633: Check return value of platform_device_add() Lee Jones
2014-08-28 13:14 ` [PATCH 10/11] mfd: twl4030-irq: Check return value from twl_i2c_write() - warn() on failure Lee Jones
2014-08-28 13:14 ` Lee Jones [this message]
2014-08-30 9:49 ` [PATCH 01/11] iio: sensors-core: st: Check st_sensors_set_drdy_int_pin()'s return value Jonathan Cameron
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