https://github.com/torvalds/linux
Revision 6593178dd46d64a5bcb0402a4f3acd95b0687abd authored by James Bottomley on 18 November 2005, 22:13:33 UTC, committed by Bartlomiej Zolnierkiewicz on 18 November 2005, 22:13:33 UTC
The following patch fixes a crash caused by attempting to bounce buffer when an IDE CD-ROM is used on a machine with an IO-MMU. [At least, this patch fixes things so I can use my IDE CD-ROM behind an ns87415 on a HP PA-RISC workstation.] Signed-off-by: James Bottomley <jejb@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
1 parent c37ea21
Tip revision: 6593178dd46d64a5bcb0402a4f3acd95b0687abd authored by James Bottomley on 18 November 2005, 22:13:33 UTC
[PATCH] ide: fix ide_toggle_bounce() to not try to bounce if we have an IOMMU
[PATCH] ide: fix ide_toggle_bounce() to not try to bounce if we have an IOMMU
Tip revision: 6593178
extable.c
/*
* lib/extable.c
* Derived from arch/ppc/mm/extable.c and arch/i386/mm/extable.c.
*
* Copyright (C) 2004 Paul Mackerras, IBM Corp.
*
* 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/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sort.h>
#include <asm/uaccess.h>
#ifndef ARCH_HAS_SORT_EXTABLE
/*
* The exception table needs to be sorted so that the binary
* search that we use to find entries in it works properly.
* This is used both for the kernel exception table and for
* the exception tables of modules that get loaded.
*/
static int cmp_ex(const void *a, const void *b)
{
const struct exception_table_entry *x = a, *y = b;
/* avoid overflow */
if (x->insn > y->insn)
return 1;
if (x->insn < y->insn)
return -1;
return 0;
}
void sort_extable(struct exception_table_entry *start,
struct exception_table_entry *finish)
{
sort(start, finish - start, sizeof(struct exception_table_entry),
cmp_ex, NULL);
}
#endif
#ifndef ARCH_HAS_SEARCH_EXTABLE
/*
* Search one exception table for an entry corresponding to the
* given instruction address, and return the address of the entry,
* or NULL if none is found.
* We use a binary search, and thus we assume that the table is
* already sorted.
*/
const struct exception_table_entry *
search_extable(const struct exception_table_entry *first,
const struct exception_table_entry *last,
unsigned long value)
{
while (first <= last) {
const struct exception_table_entry *mid;
mid = (last - first) / 2 + first;
/*
* careful, the distance between entries can be
* larger than 2GB:
*/
if (mid->insn < value)
first = mid + 1;
else if (mid->insn > value)
last = mid - 1;
else
return mid;
}
return NULL;
}
#endif
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