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dynamic_debug: add pr_errs before -EINVALs 

Ma noted that dynamic-debug is silent about many query errors, so add
pr_err()s to explain those errors, and tweak a few others.  Also parse
flags 1st, so that match-spec errs are slightly clearer.

CC: Jianpeng Ma <majianpeng@gmail.com>
CC: Joe Perches <joe@perches.com>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jim Cromie 2012-12-05 16:48:27 -05:00 committed by Greg Kroah-Hartman
parent 7a555613eb
commit 18c216c53b
1 changed files with 35 additions and 12 deletions
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47
lib/dynamic_debug.c
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@ -223,8 +223,10 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
int quote = *buf++; int quote = *buf++;
for (end = buf; *end && *end != quote; end++) for (end = buf; *end && *end != quote; end++)
; ;
if (!*end) if (!*end) {
pr_err("unclosed quote: %s\n", buf);
return -EINVAL; /* unclosed quote */ return -EINVAL; /* unclosed quote */
}
} else { } else {
for (end = buf; *end && !isspace(*end); end++) for (end = buf; *end && !isspace(*end); end++)
; ;
@ -232,8 +234,10 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
} }
/* `buf' is start of word, `end' is one past its end */ /* `buf' is start of word, `end' is one past its end */
if (nwords == maxwords) if (nwords == maxwords) {
pr_err("too many words, legal max <=%d\n", maxwords);
return -EINVAL; /* ran out of words[] before bytes */ return -EINVAL; /* ran out of words[] before bytes */
}
if (*end) if (*end)
*end++ = '\0'; /* terminate the word */ *end++ = '\0'; /* terminate the word */
words[nwords++] = buf; words[nwords++] = buf;
@ -265,7 +269,11 @@ static inline int parse_lineno(const char *str, unsigned int *val)
return 0; return 0;
} }
*val = simple_strtoul(str, &end, 10); *val = simple_strtoul(str, &end, 10);
return end == NULL || end == str || *end != '\0' ? -EINVAL : 0; if (end == NULL || end == str || *end != '\0') {
pr_err("bad line-number: %s\n", str);
return -EINVAL;
}
return 0;
} }
/* /*
@ -345,8 +353,10 @@ static int ddebug_parse_query(char *words[], int nwords,
int rc; int rc;
/* check we have an even number of words */ /* check we have an even number of words */
if (nwords % 2 != 0) if (nwords % 2 != 0) {
pr_err("expecting pairs of match-spec <value>\n");
return -EINVAL; return -EINVAL;
}
memset(query, 0, sizeof(*query)); memset(query, 0, sizeof(*query));
if (modname) if (modname)
@ -367,18 +377,22 @@ static int ddebug_parse_query(char *words[], int nwords,
char *first = words[i+1]; char *first = words[i+1];
char *last = strchr(first, '-'); char *last = strchr(first, '-');
if (query->first_lineno || query->last_lineno) { if (query->first_lineno || query->last_lineno) {
pr_err("match-spec:line given 2 times\n"); pr_err("match-spec: line used 2x\n");
return -EINVAL; return -EINVAL;
} }
if (last) if (last)
*last++ = '\0'; *last++ = '\0';
if (parse_lineno(first, &query->first_lineno) < 0) if (parse_lineno(first, &query->first_lineno) < 0) {
pr_err("line-number is <0\n");
return -EINVAL; return -EINVAL;
}
if (last) { if (last) {
/* range <first>-<last> */ /* range <first>-<last> */
if (parse_lineno(last, &query->last_lineno) if (parse_lineno(last, &query->last_lineno)
< query->first_lineno) { < query->first_lineno) {
pr_err("last-line < 1st-line\n"); pr_err("last-line:%d < 1st-line:%d\n",
query->last_lineno,
query->first_lineno);
return -EINVAL; return -EINVAL;
} }
} else { } else {
@ -414,6 +428,7 @@ static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
op = *str++; op = *str++;
break; break;
default: default:
pr_err("bad flag-op %c, at start of %s\n", *str, str);
return -EINVAL; return -EINVAL;
} }
vpr_info("op='%c'\n", op); vpr_info("op='%c'\n", op);
@ -425,8 +440,10 @@ static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
break; break;
} }
} }
if (i < 0) if (i < 0) {
pr_err("unknown flag '%c' in \"%s\"\n", *str, str);
return -EINVAL; return -EINVAL;
}
} }
vpr_info("flags=0x%x\n", flags); vpr_info("flags=0x%x\n", flags);
@ -458,13 +475,19 @@ static int ddebug_exec_query(char *query_string, const char *modname)
char *words[MAXWORDS]; char *words[MAXWORDS];
nwords = ddebug_tokenize(query_string, words, MAXWORDS); nwords = ddebug_tokenize(query_string, words, MAXWORDS);
if (nwords <= 0) if (nwords <= 0) {
pr_err("tokenize failed\n");
return -EINVAL; return -EINVAL;
if (ddebug_parse_query(words, nwords-1, &query, modname)) }
/* check flags 1st (last arg) so query is pairs of spec,val */
if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) {
pr_err("flags parse failed\n");
return -EINVAL; return -EINVAL;
if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) }
if (ddebug_parse_query(words, nwords-1, &query, modname)) {
pr_err("query parse failed\n");
return -EINVAL; return -EINVAL;
}
/* actually go and implement the change */ /* actually go and implement the change */
nfound = ddebug_change(&query, flags, mask); nfound = ddebug_change(&query, flags, mask);
vpr_info_dq(&query, nfound ? "applied" : "no-match"); vpr_info_dq(&query, nfound ? "applied" : "no-match");