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mtd: cmdlinepart: revise error handling 

This patch revises and fixes error handling in the command line mtd
partitions parser. Namely:
1. we ignored return code of 'mtdpart_setup_real()'.
2. instead of returning 0 for failure and 1 for success, teach
   'mtdpart_setup_real()' to return real error codes.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2012-09-02 13:54:14 +03:00 committed by David Woodhouse
parent 3cf7f1314e
commit 9e0606fc4e
1 changed files with 18 additions and 16 deletions
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34
drivers/mtd/cmdlinepart.c
View File

@ -39,11 +39,10 @@
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/mtd/mtd.h> #include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h> #include <linux/mtd/partitions.h>
#include <linux/bootmem.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/err.h>
/* error message prefix */ /* error message prefix */
#define ERRP "mtd: " #define ERRP "mtd: "
@ -110,7 +109,7 @@ static struct mtd_partition * newpart(char *s,
if (size < PAGE_SIZE) if (size < PAGE_SIZE)
{ {
printk(KERN_ERR ERRP "partition size too small (%lx)\n", size); printk(KERN_ERR ERRP "partition size too small (%lx)\n", size);
return NULL; return ERR_PTR(-EINVAL);
} }
} }
@ -138,7 +137,7 @@ static struct mtd_partition * newpart(char *s,
if (!p) if (!p)
{ {
printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim); printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
return NULL; return ERR_PTR(-EINVAL);
} }
name_len = p - name; name_len = p - name;
s = p + 1; s = p + 1;
@ -172,13 +171,13 @@ static struct mtd_partition * newpart(char *s,
if (size == SIZE_REMAINING) if (size == SIZE_REMAINING)
{ {
printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n"); printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
return NULL; return ERR_PTR(-EINVAL);
} }
/* more partitions follow, parse them */ /* more partitions follow, parse them */
parts = newpart(s + 1, &s, num_parts, this_part + 1, parts = newpart(s + 1, &s, num_parts, this_part + 1,
&extra_mem, extra_mem_size); &extra_mem, extra_mem_size);
if (!parts) if (IS_ERR(parts))
return NULL; return parts;
} }
else else
{ /* this is the last partition: allocate space for all */ { /* this is the last partition: allocate space for all */
@ -189,7 +188,7 @@ static struct mtd_partition * newpart(char *s,
extra_mem_size; extra_mem_size;
parts = kzalloc(alloc_size, GFP_KERNEL); parts = kzalloc(alloc_size, GFP_KERNEL);
if (!parts) if (!parts)
return NULL; return ERR_PTR(-ENOMEM);
extra_mem = (unsigned char *)(parts + *num_parts); extra_mem = (unsigned char *)(parts + *num_parts);
} }
/* enter this partition (offset will be calculated later if it is zero at this point) */ /* enter this partition (offset will be calculated later if it is zero at this point) */
@ -245,7 +244,7 @@ static int mtdpart_setup_real(char *s)
if (!(p = strchr(s, ':'))) if (!(p = strchr(s, ':')))
{ {
printk(KERN_ERR ERRP "no mtd-id\n"); printk(KERN_ERR ERRP "no mtd-id\n");
return 0; return -EINVAL;
} }
mtd_id_len = p - mtd_id; mtd_id_len = p - mtd_id;
@ -262,7 +261,7 @@ static int mtdpart_setup_real(char *s)
(unsigned char**)&this_mtd, /* out: extra mem */ (unsigned char**)&this_mtd, /* out: extra mem */
mtd_id_len + 1 + sizeof(*this_mtd) + mtd_id_len + 1 + sizeof(*this_mtd) +
sizeof(void*)-1 /*alignment*/); sizeof(void*)-1 /*alignment*/);
if(!parts) if (IS_ERR(parts))
{ {
/* /*
* An error occurred. We're either: * An error occurred. We're either:
@ -271,7 +270,7 @@ static int mtdpart_setup_real(char *s)
* Either way, this mtd is hosed and we're * Either way, this mtd is hosed and we're
* unlikely to succeed in parsing any more * unlikely to succeed in parsing any more
*/ */
return 0; return PTR_ERR(parts);
} }
/* align this_mtd */ /* align this_mtd */
@ -299,11 +298,11 @@ static int mtdpart_setup_real(char *s)
if (*s != ';') if (*s != ';')
{ {
printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s); printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s);
return 0; return -EINVAL;
} }
s++; s++;
} }
return 1; return 0;
} }
/* /*
@ -318,13 +317,16 @@ static int parse_cmdline_partitions(struct mtd_info *master,
struct mtd_part_parser_data *data) struct mtd_part_parser_data *data)
{ {
unsigned long offset; unsigned long offset;
int i; int i, err;
struct cmdline_mtd_partition *part; struct cmdline_mtd_partition *part;
const char *mtd_id = master->name; const char *mtd_id = master->name;
/* parse command line */ /* parse command line */
if (!cmdline_parsed) if (!cmdline_parsed) {
mtdpart_setup_real(cmdline); err = mtdpart_setup_real(cmdline);
if (err)
return err;
}
for(part = partitions; part; part = part->next) for(part = partitions; part; part = part->next)
{ {