Re: [PATCH v2 07/14] mtdparts: use negative error codes

Hi

On Tue, Jan 9, 2024 at 6:32 PM Alexey Romanov avromanov@salutedevices.com wrote:

It is bad practice to use such error codes. Error codes must be negative.

Also, fastboot code expects that if successful, mtdparts functions will return a value greater than 0. You can see fastboot_nand_get_part_info() functions calls inside getvar_get_part_info().

Signed-off-by: Alexey Romanov avromanov@salutedevices.com

cmd/mtdparts.c | 134 ++++++++++++++++++++++++------------------------- 1 file changed, 67 insertions(+), 67 deletions(-)

diff --git a/cmd/mtdparts.c b/cmd/mtdparts.c index b31db73ebf..00c07014b2 100644 --- a/cmd/mtdparts.c +++ b/cmd/mtdparts.c @@ -299,7 +299,7 @@ static void current_save(void)

• @param type mtd type
• @param num mtd number
• @param mtd a pointer to an mtd_info instance (output)

• • Return: 0 if device is valid, 1 otherwise

• • Return: 0 if device is valid, -errno otherwise
  */

static int get_mtd_info(u8 type, u8 num, struct mtd_info **mtd) { @@ -309,7 +309,7 @@ static int get_mtd_info(u8 type, u8 num, struct mtd_info **mtd) *mtd = get_mtd_device_nm(mtd_dev); if (IS_ERR(*mtd)) { printf("Device %s not found!\n", mtd_dev);

•           return 1;
  

•           return -ENODEV;
    }
    put_mtd_device(*mtd);
  
  

@@ -323,7 +323,7 @@ static int get_mtd_info(u8 type, u8 num, struct mtd_info **mtd)

• @param id of the parent device
• @param part partition to validate

• • Return: 0 if partition is valid, 1 otherwise

• • Return: 0 if partition is valid, -errno otherwise
  */

static int part_validate_eraseblock(struct mtdids *id, struct part_info *part) { @@ -333,7 +333,7 @@ static int part_validate_eraseblock(struct mtdids *id, struct part_info *part) u64 offset, size;

    if (get_mtd_info(id->type, id->num, &mtd))

•           return 1;
  

•           return -EINVAL;
  
    part->sector_size = mtd->erasesize;
  
  

@@ -347,14 +347,14 @@ static int part_validate_eraseblock(struct mtdids *id, struct part_info *part) printf("%s%d: partition (%s) start offset" "alignment incorrect\n", MTD_DEV_TYPE(id->type), id->num, part->name);

•                   return 1;
  

•                   return -EINVAL;
            }
  
            size = part->size;
            if (do_div(size, mtd->erasesize)) {
                    printf("%s%d: partition (%s) size alignment incorrect\n",
                           MTD_DEV_TYPE(id->type), id->num, part->name);
  

•                   return 1;
  

•                   return -EINVAL;
            }
    } else {
            /*
  

@@ -374,7 +374,7 @@ static int part_validate_eraseblock(struct mtdids *id, struct part_info *part)

            printf("%s%d: partition (%s) start offset alignment incorrect\n",
                   MTD_DEV_TYPE(id->type), id->num, part->name);

•           return 1;
  

•           return -EINVAL;
  
    start_ok:
  
  

@@ -393,7 +393,7 @@ static int part_validate_eraseblock(struct mtdids *id, struct part_info *part)

            printf("%s%d: partition (%s) size alignment incorrect\n",
                   MTD_DEV_TYPE(id->type), id->num, part->name);

•           return 1;
  

•           return -EINVAL;
  
    end_ok:
            return 0;
  

@@ -410,7 +410,7 @@ static int part_validate_eraseblock(struct mtdids *id, struct part_info *part)

• @param id of the parent device
• @param part partition to validate

• • Return: 0 if partition is valid, 1 otherwise

• • Return: 0 if partition is valid, -errno otherwise
  */

static int part_validate(struct mtdids *id, struct part_info *part) { @@ -420,18 +420,18 @@ static int part_validate(struct mtdids *id, struct part_info *part) if (part->offset > id->size) { printf("%s: offset %08llx beyond flash size %08llx\n", id->mtd_id, part->offset, id->size);

•           return 1;
  

•           return -EINVAL;
    }
  
    if ((part->offset + part->size) <= part->offset) {
            printf("%s%d: partition (%s) size too big\n",
                            MTD_DEV_TYPE(id->type), id->num, part->name);
  

•           return 1;
  

•           return -EINVAL;
    }
  
    if (part->offset + part->size > id->size) {
            printf("%s: partitioning exceeds flash size\n", id->mtd_id);
  

•           return 1;
  

•           return -EINVAL;
    }
  
    /*
  

@@ -446,7 +446,7 @@ static int part_validate(struct mtdids *id, struct part_info *part)

• @param dev device to delete partition from
• @param part partition to delete

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -ernno otherwise
  */

static int part_del(struct mtd_device *dev, struct part_info *part) { @@ -544,7 +544,7 @@ static int part_sort_add(struct mtd_device *dev, struct part_info *part) /* be compliant with kernel cmdline, allow only one partition at offset zero */ if ((new_pi->offset == pi->offset) && (pi->offset == 0)) { printf("cannot add second partition at offset 0\n");

•                   return 1;
  

•                   return -EINVAL;
            }
  
            if (new_pi->offset <= pi->offset) {
  

@@ -574,17 +574,17 @@ static int part_sort_add(struct mtd_device *dev, struct part_info *part)

• @param dev device to which partition is added
• @param part partition to be added

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int part_add(struct mtd_device *dev, struct part_info *part) { /* verify alignment and size */ if (part_validate(dev->id, part) != 0)

•           return 1;
  

•           return -EINVAL;
  
    /* partition is ok, add it to the list */
    if (part_sort_add(dev, part) != 0)
  

•           return 1;
  

•           return -EINVAL;
  
    return 0;
  

} @@ -596,7 +596,7 @@ static int part_add(struct mtd_device *dev, struct part_info *part)

• @param partdef pointer to the partition definition string i.e. <part-def>
• @param ret output pointer to next char after parse completes (output)
• @param retpart pointer to the allocated partition (output)

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int part_parse(const char *const partdef, const char **ret, struct part_info **retpart) { @@ -622,7 +622,7 @@ static int part_parse(const char *const partdef, const char **ret, struct part_i size = memsize_parse(p, &p); if (size < MIN_PART_SIZE) { printf("partition size too small (%llx)\n", size);

•                   return 1;
  

•                   return -EINVAL;
            }
    }
  
  

@@ -638,12 +638,12 @@ static int part_parse(const char *const partdef, const char **ret, struct part_i name = ++p; if ((p = strchr(name, ')')) == NULL) { printf("no closing ) found in partition name\n");

•                   return 1;
  

•                   return -EINVAL;
            }
            name_len = p - name + 1;
            if ((name_len - 1) == 0) {
                    printf("empty partition name\n");
  

•                   return 1;
  

•                   return -EINVAL;
            }
            p++;
    } else {
  

@@ -664,7 +664,7 @@ static int part_parse(const char *const partdef, const char **ret, struct part_i if (size == SIZE_REMAINING) { *ret = NULL; printf("no partitions allowed after a fill-up partition\n");

•                   return 1;
  

•                   return -EINVAL;
            }
            *ret = ++p;
    } else if ((*p == ';') || (*p == '\0')) {
  

@@ -672,14 +672,14 @@ static int part_parse(const char *const partdef, const char **ret, struct part_i } else { printf("unexpected character '%c' at the end of partition\n", *p); *ret = NULL;

•           return 1;
  

•           return -EINVAL;
    }
  
    /*  allocate memory */
    part = (struct part_info *)malloc(sizeof(struct part_info) + name_len);
    if (!part) {
            printf("out of memory\n");
  

•           return 1;
  

•           return -ENOMEM;
    }
    memset(part, 0, sizeof(struct part_info) + name_len);
    part->size = size;
  

@@ -714,14 +714,14 @@ static int part_parse(const char *const partdef, const char **ret, struct part_i

• @param type mtd type
• @param num mtd number
• @param size a pointer to the size of the mtd device (output)

• • Return: 0 if device is valid, 1 otherwise

• • Return: 0 if device is valid, -errno otherwise
  */

static int mtd_device_validate(u8 type, u8 num, u64 *size) { struct mtd_info *mtd = NULL;

    if (get_mtd_info(type, num, &mtd))

•           return 1;
  

•           return -EINVAL;
  
    *size = mtd->size;
  
  

@@ -732,7 +732,7 @@ static int mtd_device_validate(u8 type, u8 num, u64 *size)

• Delete all mtd devices from a supplied devices list, free memory allocated for
• each device and delete all device partitions.

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int device_delall(struct list_head *head) { @@ -756,7 +756,7 @@ static int device_delall(struct list_head *head)

• from device list and device memory is freed.
• @param dev device to be deleted

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int device_del(struct mtd_device *dev) { @@ -835,7 +835,7 @@ static void device_add(struct mtd_device *dev)

• @param mtd_dev pointer to the device definition string i.e. <mtd-dev>
• @param ret output pointer to next char after parse completes (output)
• @param retdev pointer to the allocated device (output)

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_device **retdev) { @@ -864,7 +864,7 @@ static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_ mtd_id = p = mtd_dev; if (!(p = strchr(mtd_id, ':'))) { printf("no <mtd-id> identifier\n");

•           return 1;
  

•           return -EINVAL;
    }
    mtd_id_len = p - mtd_id + 1;
    p++;
  

@@ -872,7 +872,7 @@ static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_ /* verify if we have a valid device specified */ if ((id = id_find_by_mtd_id(mtd_id, mtd_id_len - 1)) == NULL) { printf("invalid mtd device '%.*s'\n", mtd_id_len - 1, mtd_id);

•           return 1;
  

•           return -ENODEV;
    }
  
    pend = strchr(p, ';');
  

@@ -915,7 +915,7 @@ static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_ } if (err == 1) { part_delall(&tmp_list);

•           return 1;
  

•           return -EINVAL;
    }
  
    debug("\ntotal partitions: %d\n", num_parts);
  

@@ -932,14 +932,14 @@ static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_ printf("unexpected character '%c' at the end of device\n", *p); if (ret) *ret = NULL;

•                   return 1;
  

•                   return -EINVAL;
            }
    }
  
    /* allocate memory for mtd_device structure */
    if ((dev = (struct mtd_device *)malloc(sizeof(struct mtd_device))) == NULL) {
            printf("out of memory\n");
  

•           return 1;
  

•           return -ENOMEM;
    }
    memset(dev, 0, sizeof(struct mtd_device));
    dev->id = id;
  

@@ -953,7 +953,7 @@ static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_ list_del(entry); if (part_sort_add(dev, part) != 0) { device_del(dev);

•                   return 1;
  

•                   return -EINVAL;
            }
    }
  
  

@@ -966,7 +966,7 @@ static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_ /**

• Initialize global device list.

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int mtd_devices_init(void) { @@ -1037,7 +1037,7 @@ static struct mtdids* id_find_by_mtd_id(const char *mtd_id, unsigned int mtd_id_

• @param ret_id output pointer to next char after parse completes (output)
• @param dev_type parsed device type (output)
• @param dev_num parsed device number (output)

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

int mtd_id_parse(const char *id, const char **ret_id, u8 *dev_type, u8 *dev_num) @@ -1059,12 +1059,12 @@ int mtd_id_parse(const char *id, const char **ret_id, u8 *dev_type, p += 8; } else { printf("incorrect device type in %s\n", id);

•           return 1;
  

•           return -EINVAL;
    }
  
    if (!isdigit(*p)) {
            printf("incorrect device number in %s\n", id);
  

•           return 1;
  

•           return -EINVAL;
    }
  
    *dev_num = simple_strtoul(p, (char **)&p, 0);
  

@@ -1079,7 +1079,7 @@ int mtd_id_parse(const char *id, const char **ret_id, u8 *dev_type,

• @param buf output buffer holding generated mtdparts string (output)
• @param buflen buffer size

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int generate_mtdparts(char *buf, u32 buflen) { @@ -1195,7 +1195,7 @@ static int generate_mtdparts(char *buf, u32 buflen)

cleanup: last_parts[0] = '\0';

•   return 1;
  

•   return -EINVAL;
  

}

/** @@ -1204,7 +1204,7 @@ cleanup:

• @param buf output buffer holding generated mtdparts string (output)
• @param buflen buffer size

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int generate_mtdparts_save(char *buf, u32 buflen) { @@ -1342,7 +1342,7 @@ static void list_partitions(void)

• @param dev pointer to the requested device (output)
• @param part_num verified partition number (output)
• @param part pointer to requested partition (output)

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

int find_dev_and_part(const char *id, struct mtd_device **dev, u8 *part_num, struct part_info **part) @@ -1370,27 +1370,27 @@ int find_dev_and_part(const char *id, struct mtd_device **dev, *part_num = 0;

    if (mtd_id_parse(p, &p, &type, &dnum) != 0)

•           return 1;
  

•           return -EINVAL;
  
    if ((*p++ != ',') || (*p == '\0')) {
            printf("no partition number specified\n");
  

•           return 1;
  

•           return -EINVAL;
    }
    pnum = simple_strtoul(p, (char **)&p, 0);
    if (*p != '\0') {
            printf("unexpected trailing character '%c'\n", *p);
  

•           return 1;
  

•           return -EINVAL;
    }
  
    if ((*dev = device_find(type, dnum)) == NULL) {
            printf("no such device %s%d\n", MTD_DEV_TYPE(type), dnum);
  

•           return 1;
  

•           return -ENODEV;
    }
  
    if ((*part = mtd_part_info(*dev, pnum)) == NULL) {
            printf("no such partition\n");
            *dev = NULL;
  

•           return 1;
  

•           return -EINVAL;
    }
  
    *part_num = pnum;
  

@@ -1402,7 +1402,7 @@ int find_dev_and_part(const char *id, struct mtd_device **dev,

• Find and delete partition. For partition id format see find_dev_and_part().
• @param id string describing device and partition

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int delete_partition(const char *id) { @@ -1417,17 +1417,17 @@ static int delete_partition(const char *id) part->name, part->size, part->offset);

            if (part_del(dev, part) != 0)

•                   return 1;
  

•                   return -EINVAL;
  
            if (generate_mtdparts_save(last_parts, MTDPARTS_MAXLEN) != 0) {
                    printf("generated mtdparts too long, resetting to null\n");
  

•                   return 1;
  

•                   return -EINVAL;
            }
            return 0;
    }
  
    printf("partition %s not found\n", id);
  

•   return 1;
  

•   return -ENOENT;
  

}

#if defined(CONFIG_CMD_MTDPARTS_SPREAD) @@ -1478,7 +1478,7 @@ static void spread_partition(struct mtd_info *mtd, struct part_info *part,

• as big as their mtdparts environment variable sizes and they each start
• on a good block.

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int spread_partitions(void) { @@ -1493,7 +1493,7 @@ static int spread_partitions(void) dev = list_entry(dentry, struct mtd_device, link);

            if (get_mtd_info(dev->id->type, dev->id->num, &mtd))

•                   return 1;
  

•                   return -EINVAL;
  
            part_num = 0;
            cur_offs = 0;
  

@@ -1519,7 +1519,7 @@ static int spread_partitions(void)

    if (generate_mtdparts_save(last_parts, MTDPARTS_MAXLEN) != 0) {
            printf("generated mtdparts too long, resetting to null\n");

•           return 1;
  

•           return -EINVAL;
    }
    return 0;
  

} @@ -1547,7 +1547,7 @@ static const char *env_get_mtdparts(char *buf)

• for each entry. Add created devices to the global devices list.
• @param mtdparts string specifing mtd partitions

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int parse_mtdparts(const char *const mtdparts) { @@ -1605,7 +1605,7 @@ static int parse_mtdparts(const char *const mtdparts)

• to the global mtdids list.
• @param ids mapping string

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

static int parse_mtdids(const char *const ids) { @@ -1646,7 +1646,7 @@ static int parse_mtdids(const char *const ids)

            /* check if requested device exists */
            if (mtd_device_validate(type, num, &size) != 0)

•                   return 1;
  

•                   return -EINVAL;
  
            /* locate <mtd-id> */
            mtd_id = p;
  

@@ -1704,7 +1704,7 @@ static int parse_mtdids(const char *const ids) list_del(entry); free(id_tmp); }

•           return 1;
  

•           return -EINVAL;
    }
  
    return 0;
  

@@ -1715,7 +1715,7 @@ static int parse_mtdids(const char *const ids)

• Parse and initialize global mtdids mapping and create global
• device/partition list.

• • Return: 0 on success, 1 otherwise

• • Return: 0 on success, -errno otherwise
  */

int mtdparts_init(void) { @@ -1768,12 +1768,12 @@ int mtdparts_init(void) env_set("mtdids", (char *)ids); } else { printf("mtdids not defined, no default present\n");

•                   return 1;
  

•                   return -ENXIO;
            }
    }
    if (strlen(ids) > MTDIDS_MAXLEN - 1) {
            printf("mtdids too long (> %d)\n", MTDIDS_MAXLEN);
  

•           return 1;
  

•           return -EINVAL;
    }
  
    /* use defaults when mtdparts variable is not defined
  

@@ -1789,7 +1789,7 @@ int mtdparts_init(void)

    if (parts && (strlen(parts) > MTDPARTS_MAXLEN - 1)) {
            printf("mtdparts too long (> %d)\n", MTDPARTS_MAXLEN);

•           return 1;
  

•           return -EINVAL;
    }
  
    /* check if we have already parsed those mtdids */
  

@@ -1800,7 +1800,7 @@ int mtdparts_init(void)

            if (parse_mtdids(ids) != 0) {
                    mtd_devices_init();

•                   return 1;
  

•                   return -EINVAL;
            }
  
            /* ok it's good, save new ids */
  

@@ -1810,11 +1810,11 @@ int mtdparts_init(void) /* parse partitions if either mtdparts or mtdids were updated */ if (parts && ((last_parts[0] == '\0') || ((strcmp(last_parts, parts) != 0)) || ids_changed)) { if (parse_mtdparts(parts) != 0)

•                   return 1;
  

•                   return -EINVAL;
  
            if (list_empty(&devices)) {
                    printf("mtdparts_init: no valid partitions\n");
  

•                   return 1;
  

•                   return -ENXIO;
            }
  
            /* ok it's good, save new parts */
  

@@ -2022,7 +2022,7 @@ static int do_mtdparts(struct cmd_tbl *cmdtp, int flag, int argc, debug("add tmpbuf: %s\n", tmpbuf);

            if ((device_parse(tmpbuf, NULL, &dev) != 0) || (!dev))

•                   return 1;
  

•                   return -EINVAL;
  
            debug("+ %s\t%d\t%s\n", MTD_DEV_TYPE(dev->id->type),
                            dev->id->num, dev->id->mtd_id);
  

-- 2.30.1

Reviewed-by: Michael Trimarchi michael@amarulasolutions.com