Revision 40509ca982c00c4b70fc00be887509feca0bff15 authored by Johan Hovold on 19 March 2013, 08:21:22 UTC, committed by Greg Kroah-Hartman on 21 March 2013, 22:59:05 UTC
Use the port wait queue and make sure to check the serial disconnected flag before accessing private port data after waking up. This is is needed as the private port data (including the wait queue itself) can be gone when waking up after a disconnect. Cc: stable <stable@vger.kernel.org> Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 parent 8edfdab
ts_kmp.c
/*
* lib/ts_kmp.c Knuth-Morris-Pratt text search implementation
*
* 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.
*
* Authors: Thomas Graf <tgraf@suug.ch>
*
* ==========================================================================
*
* Implements a linear-time string-matching algorithm due to Knuth,
* Morris, and Pratt [1]. Their algorithm avoids the explicit
* computation of the transition function DELTA altogether. Its
* matching time is O(n), for n being length(text), using just an
* auxiliary function PI[1..m], for m being length(pattern),
* precomputed from the pattern in time O(m). The array PI allows
* the transition function DELTA to be computed efficiently
* "on the fly" as needed. Roughly speaking, for any state
* "q" = 0,1,...,m and any character "a" in SIGMA, the value
* PI["q"] contains the information that is independent of "a" and
* is needed to compute DELTA("q", "a") [2]. Since the array PI
* has only m entries, whereas DELTA has O(m|SIGMA|) entries, we
* save a factor of |SIGMA| in the preprocessing time by computing
* PI rather than DELTA.
*
* [1] Cormen, Leiserson, Rivest, Stein
* Introdcution to Algorithms, 2nd Edition, MIT Press
* [2] See finite automation theory
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/textsearch.h>
struct ts_kmp
{
u8 * pattern;
unsigned int pattern_len;
unsigned int prefix_tbl[0];
};
static unsigned int kmp_find(struct ts_config *conf, struct ts_state *state)
{
struct ts_kmp *kmp = ts_config_priv(conf);
unsigned int i, q = 0, text_len, consumed = state->offset;
const u8 *text;
const int icase = conf->flags & TS_IGNORECASE;
for (;;) {
text_len = conf->get_next_block(consumed, &text, conf, state);
if (unlikely(text_len == 0))
break;
for (i = 0; i < text_len; i++) {
while (q > 0 && kmp->pattern[q]
!= (icase ? toupper(text[i]) : text[i]))
q = kmp->prefix_tbl[q - 1];
if (kmp->pattern[q]
== (icase ? toupper(text[i]) : text[i]))
q++;
if (unlikely(q == kmp->pattern_len)) {
state->offset = consumed + i + 1;
return state->offset - kmp->pattern_len;
}
}
consumed += text_len;
}
return UINT_MAX;
}
static inline void compute_prefix_tbl(const u8 *pattern, unsigned int len,
unsigned int *prefix_tbl, int flags)
{
unsigned int k, q;
const u8 icase = flags & TS_IGNORECASE;
for (k = 0, q = 1; q < len; q++) {
while (k > 0 && (icase ? toupper(pattern[k]) : pattern[k])
!= (icase ? toupper(pattern[q]) : pattern[q]))
k = prefix_tbl[k-1];
if ((icase ? toupper(pattern[k]) : pattern[k])
== (icase ? toupper(pattern[q]) : pattern[q]))
k++;
prefix_tbl[q] = k;
}
}
static struct ts_config *kmp_init(const void *pattern, unsigned int len,
gfp_t gfp_mask, int flags)
{
struct ts_config *conf;
struct ts_kmp *kmp;
int i;
unsigned int prefix_tbl_len = len * sizeof(unsigned int);
size_t priv_size = sizeof(*kmp) + len + prefix_tbl_len;
conf = alloc_ts_config(priv_size, gfp_mask);
if (IS_ERR(conf))
return conf;
conf->flags = flags;
kmp = ts_config_priv(conf);
kmp->pattern_len = len;
compute_prefix_tbl(pattern, len, kmp->prefix_tbl, flags);
kmp->pattern = (u8 *) kmp->prefix_tbl + prefix_tbl_len;
if (flags & TS_IGNORECASE)
for (i = 0; i < len; i++)
kmp->pattern[i] = toupper(((u8 *)pattern)[i]);
else
memcpy(kmp->pattern, pattern, len);
return conf;
}
static void *kmp_get_pattern(struct ts_config *conf)
{
struct ts_kmp *kmp = ts_config_priv(conf);
return kmp->pattern;
}
static unsigned int kmp_get_pattern_len(struct ts_config *conf)
{
struct ts_kmp *kmp = ts_config_priv(conf);
return kmp->pattern_len;
}
static struct ts_ops kmp_ops = {
.name = "kmp",
.find = kmp_find,
.init = kmp_init,
.get_pattern = kmp_get_pattern,
.get_pattern_len = kmp_get_pattern_len,
.owner = THIS_MODULE,
.list = LIST_HEAD_INIT(kmp_ops.list)
};
static int __init init_kmp(void)
{
return textsearch_register(&kmp_ops);
}
static void __exit exit_kmp(void)
{
textsearch_unregister(&kmp_ops);
}
MODULE_LICENSE("GPL");
module_init(init_kmp);
module_exit(exit_kmp);
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