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
tps65912-irq.c
/*
* tps65912-irq.c -- TI TPS6591x
*
* Copyright 2011 Texas Instruments Inc.
*
* Author: Margarita Olaya <magi@slimlogic.co.uk>
*
* 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.
*
* This driver is based on wm8350 implementation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bug.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/mfd/tps65912.h>
static inline int irq_to_tps65912_irq(struct tps65912 *tps65912,
int irq)
{
return irq - tps65912->irq_base;
}
/*
* This is a threaded IRQ handler so can access I2C/SPI. Since the
* IRQ handler explicitly clears the IRQ it handles the IRQ line
* will be reasserted and the physical IRQ will be handled again if
* another interrupt is asserted while we run - in the normal course
* of events this is a rare occurrence so we save I2C/SPI reads. We're
* also assuming that it's rare to get lots of interrupts firing
* simultaneously so try to minimise I/O.
*/
static irqreturn_t tps65912_irq(int irq, void *irq_data)
{
struct tps65912 *tps65912 = irq_data;
u32 irq_sts;
u32 irq_mask;
u8 reg;
int i;
tps65912->read(tps65912, TPS65912_INT_STS, 1, ®);
irq_sts = reg;
tps65912->read(tps65912, TPS65912_INT_STS2, 1, ®);
irq_sts |= reg << 8;
tps65912->read(tps65912, TPS65912_INT_STS3, 1, ®);
irq_sts |= reg << 16;
tps65912->read(tps65912, TPS65912_INT_STS4, 1, ®);
irq_sts |= reg << 24;
tps65912->read(tps65912, TPS65912_INT_MSK, 1, ®);
irq_mask = reg;
tps65912->read(tps65912, TPS65912_INT_MSK2, 1, ®);
irq_mask |= reg << 8;
tps65912->read(tps65912, TPS65912_INT_MSK3, 1, ®);
irq_mask |= reg << 16;
tps65912->read(tps65912, TPS65912_INT_MSK4, 1, ®);
irq_mask |= reg << 24;
irq_sts &= ~irq_mask;
if (!irq_sts)
return IRQ_NONE;
for (i = 0; i < tps65912->irq_num; i++) {
if (!(irq_sts & (1 << i)))
continue;
handle_nested_irq(tps65912->irq_base + i);
}
/* Write the STS register back to clear IRQs we handled */
reg = irq_sts & 0xFF;
irq_sts >>= 8;
if (reg)
tps65912->write(tps65912, TPS65912_INT_STS, 1, ®);
reg = irq_sts & 0xFF;
irq_sts >>= 8;
if (reg)
tps65912->write(tps65912, TPS65912_INT_STS2, 1, ®);
reg = irq_sts & 0xFF;
irq_sts >>= 8;
if (reg)
tps65912->write(tps65912, TPS65912_INT_STS3, 1, ®);
reg = irq_sts & 0xFF;
if (reg)
tps65912->write(tps65912, TPS65912_INT_STS4, 1, ®);
return IRQ_HANDLED;
}
static void tps65912_irq_lock(struct irq_data *data)
{
struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data);
mutex_lock(&tps65912->irq_lock);
}
static void tps65912_irq_sync_unlock(struct irq_data *data)
{
struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data);
u32 reg_mask;
u8 reg;
tps65912->read(tps65912, TPS65912_INT_MSK, 1, ®);
reg_mask = reg;
tps65912->read(tps65912, TPS65912_INT_MSK2, 1, ®);
reg_mask |= reg << 8;
tps65912->read(tps65912, TPS65912_INT_MSK3, 1, ®);
reg_mask |= reg << 16;
tps65912->read(tps65912, TPS65912_INT_MSK4, 1, ®);
reg_mask |= reg << 24;
if (tps65912->irq_mask != reg_mask) {
reg = tps65912->irq_mask & 0xFF;
tps65912->write(tps65912, TPS65912_INT_MSK, 1, ®);
reg = tps65912->irq_mask >> 8 & 0xFF;
tps65912->write(tps65912, TPS65912_INT_MSK2, 1, ®);
reg = tps65912->irq_mask >> 16 & 0xFF;
tps65912->write(tps65912, TPS65912_INT_MSK3, 1, ®);
reg = tps65912->irq_mask >> 24 & 0xFF;
tps65912->write(tps65912, TPS65912_INT_MSK4, 1, ®);
}
mutex_unlock(&tps65912->irq_lock);
}
static void tps65912_irq_enable(struct irq_data *data)
{
struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data);
tps65912->irq_mask &= ~(1 << irq_to_tps65912_irq(tps65912, data->irq));
}
static void tps65912_irq_disable(struct irq_data *data)
{
struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data);
tps65912->irq_mask |= (1 << irq_to_tps65912_irq(tps65912, data->irq));
}
static struct irq_chip tps65912_irq_chip = {
.name = "tps65912",
.irq_bus_lock = tps65912_irq_lock,
.irq_bus_sync_unlock = tps65912_irq_sync_unlock,
.irq_disable = tps65912_irq_disable,
.irq_enable = tps65912_irq_enable,
};
int tps65912_irq_init(struct tps65912 *tps65912, int irq,
struct tps65912_platform_data *pdata)
{
int ret, cur_irq;
int flags = IRQF_ONESHOT;
u8 reg;
if (!irq) {
dev_warn(tps65912->dev, "No interrupt support, no core IRQ\n");
return 0;
}
if (!pdata || !pdata->irq_base) {
dev_warn(tps65912->dev, "No interrupt support, no IRQ base\n");
return 0;
}
/* Clear unattended interrupts */
tps65912->read(tps65912, TPS65912_INT_STS, 1, ®);
tps65912->write(tps65912, TPS65912_INT_STS, 1, ®);
tps65912->read(tps65912, TPS65912_INT_STS2, 1, ®);
tps65912->write(tps65912, TPS65912_INT_STS2, 1, ®);
tps65912->read(tps65912, TPS65912_INT_STS3, 1, ®);
tps65912->write(tps65912, TPS65912_INT_STS3, 1, ®);
tps65912->read(tps65912, TPS65912_INT_STS4, 1, ®);
tps65912->write(tps65912, TPS65912_INT_STS4, 1, ®);
/* Mask top level interrupts */
tps65912->irq_mask = 0xFFFFFFFF;
mutex_init(&tps65912->irq_lock);
tps65912->chip_irq = irq;
tps65912->irq_base = pdata->irq_base;
tps65912->irq_num = TPS65912_NUM_IRQ;
/* Register with genirq */
for (cur_irq = tps65912->irq_base;
cur_irq < tps65912->irq_num + tps65912->irq_base;
cur_irq++) {
irq_set_chip_data(cur_irq, tps65912);
irq_set_chip_and_handler(cur_irq, &tps65912_irq_chip,
handle_edge_irq);
irq_set_nested_thread(cur_irq, 1);
/* ARM needs us to explicitly flag the IRQ as valid
* and will set them noprobe when we do so. */
#ifdef CONFIG_ARM
set_irq_flags(cur_irq, IRQF_VALID);
#else
irq_set_noprobe(cur_irq);
#endif
}
ret = request_threaded_irq(irq, NULL, tps65912_irq, flags,
"tps65912", tps65912);
irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);
if (ret != 0)
dev_err(tps65912->dev, "Failed to request IRQ: %d\n", ret);
return ret;
}
int tps65912_irq_exit(struct tps65912 *tps65912)
{
free_irq(tps65912->chip_irq, tps65912);
return 0;
}
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