Revision 016e8d44bc06dd3322f26712bdd3f3a6973592d0 authored by Josh Boyer on 19 August 2011, 18:50:26 UTC, committed by Al Viro on 19 November 2011, 16:13:26 UTC
Newer versions of MINIX can create filesystems that allocate an extra bitmap block. Mounting of this succeeds, but doing a statfs call will result in an oops in count_free because of a negative number being used for the bh index. Avoid this by verifying the number of allocated blocks at mount time, erroring out if there are not enough and make statfs ignore the extras if there are too many. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=18792 Signed-off-by: Josh Boyer <jwboyer@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1 parent d633180
wm8350-gpio.c
/*
* wm8350-core.c -- Device access for Wolfson WM8350
*
* Copyright 2007, 2008 Wolfson Microelectronics PLC.
*
* Author: Liam Girdwood
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/mfd/wm8350/core.h>
#include <linux/mfd/wm8350/gpio.h>
#include <linux/mfd/wm8350/pmic.h>
static int gpio_set_dir(struct wm8350 *wm8350, int gpio, int dir)
{
int ret;
wm8350_reg_unlock(wm8350);
if (dir == WM8350_GPIO_DIR_OUT)
ret = wm8350_clear_bits(wm8350,
WM8350_GPIO_CONFIGURATION_I_O,
1 << gpio);
else
ret = wm8350_set_bits(wm8350,
WM8350_GPIO_CONFIGURATION_I_O,
1 << gpio);
wm8350_reg_lock(wm8350);
return ret;
}
static int wm8350_gpio_set_debounce(struct wm8350 *wm8350, int gpio, int db)
{
if (db == WM8350_GPIO_DEBOUNCE_ON)
return wm8350_set_bits(wm8350, WM8350_GPIO_DEBOUNCE,
1 << gpio);
else
return wm8350_clear_bits(wm8350,
WM8350_GPIO_DEBOUNCE, 1 << gpio);
}
static int gpio_set_func(struct wm8350 *wm8350, int gpio, int func)
{
u16 reg;
wm8350_reg_unlock(wm8350);
switch (gpio) {
case 0:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
& ~WM8350_GP0_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
reg | ((func & 0xf) << 0));
break;
case 1:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
& ~WM8350_GP1_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
reg | ((func & 0xf) << 4));
break;
case 2:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
& ~WM8350_GP2_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
reg | ((func & 0xf) << 8));
break;
case 3:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
& ~WM8350_GP3_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
reg | ((func & 0xf) << 12));
break;
case 4:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
& ~WM8350_GP4_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
reg | ((func & 0xf) << 0));
break;
case 5:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
& ~WM8350_GP5_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
reg | ((func & 0xf) << 4));
break;
case 6:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
& ~WM8350_GP6_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
reg | ((func & 0xf) << 8));
break;
case 7:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
& ~WM8350_GP7_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
reg | ((func & 0xf) << 12));
break;
case 8:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
& ~WM8350_GP8_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
reg | ((func & 0xf) << 0));
break;
case 9:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
& ~WM8350_GP9_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
reg | ((func & 0xf) << 4));
break;
case 10:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
& ~WM8350_GP10_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
reg | ((func & 0xf) << 8));
break;
case 11:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
& ~WM8350_GP11_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
reg | ((func & 0xf) << 12));
break;
case 12:
reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_4)
& ~WM8350_GP12_FN_MASK;
wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_4,
reg | ((func & 0xf) << 0));
break;
default:
wm8350_reg_lock(wm8350);
return -EINVAL;
}
wm8350_reg_lock(wm8350);
return 0;
}
static int gpio_set_pull_up(struct wm8350 *wm8350, int gpio, int up)
{
if (up)
return wm8350_set_bits(wm8350,
WM8350_GPIO_PIN_PULL_UP_CONTROL,
1 << gpio);
else
return wm8350_clear_bits(wm8350,
WM8350_GPIO_PIN_PULL_UP_CONTROL,
1 << gpio);
}
static int gpio_set_pull_down(struct wm8350 *wm8350, int gpio, int down)
{
if (down)
return wm8350_set_bits(wm8350,
WM8350_GPIO_PULL_DOWN_CONTROL,
1 << gpio);
else
return wm8350_clear_bits(wm8350,
WM8350_GPIO_PULL_DOWN_CONTROL,
1 << gpio);
}
static int gpio_set_polarity(struct wm8350 *wm8350, int gpio, int pol)
{
if (pol == WM8350_GPIO_ACTIVE_HIGH)
return wm8350_set_bits(wm8350,
WM8350_GPIO_PIN_POLARITY_TYPE,
1 << gpio);
else
return wm8350_clear_bits(wm8350,
WM8350_GPIO_PIN_POLARITY_TYPE,
1 << gpio);
}
static int gpio_set_invert(struct wm8350 *wm8350, int gpio, int invert)
{
if (invert == WM8350_GPIO_INVERT_ON)
return wm8350_set_bits(wm8350, WM8350_GPIO_INT_MODE, 1 << gpio);
else
return wm8350_clear_bits(wm8350,
WM8350_GPIO_INT_MODE, 1 << gpio);
}
int wm8350_gpio_config(struct wm8350 *wm8350, int gpio, int dir, int func,
int pol, int pull, int invert, int debounce)
{
/* make sure we never pull up and down at the same time */
if (pull == WM8350_GPIO_PULL_NONE) {
if (gpio_set_pull_up(wm8350, gpio, 0))
goto err;
if (gpio_set_pull_down(wm8350, gpio, 0))
goto err;
} else if (pull == WM8350_GPIO_PULL_UP) {
if (gpio_set_pull_down(wm8350, gpio, 0))
goto err;
if (gpio_set_pull_up(wm8350, gpio, 1))
goto err;
} else if (pull == WM8350_GPIO_PULL_DOWN) {
if (gpio_set_pull_up(wm8350, gpio, 0))
goto err;
if (gpio_set_pull_down(wm8350, gpio, 1))
goto err;
}
if (gpio_set_invert(wm8350, gpio, invert))
goto err;
if (gpio_set_polarity(wm8350, gpio, pol))
goto err;
if (wm8350_gpio_set_debounce(wm8350, gpio, debounce))
goto err;
if (gpio_set_dir(wm8350, gpio, dir))
goto err;
return gpio_set_func(wm8350, gpio, func);
err:
return -EIO;
}
EXPORT_SYMBOL_GPL(wm8350_gpio_config);
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