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SubjectRe: [RESEND PATCH v2 2/3] mtd: spi-nor: parse SFDP Sector Map Parameter Table
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On 09/03/2018 08:40 PM, Marek Vasut wrote:
> On 08/27/2018 12:26 PM, Tudor Ambarus wrote:
> [...]
>> +static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt)
>> +{
>> + const u32 *ret = NULL;
>> + u32 i, addr;
>> + int err;
>> + u8 addr_width, read_opcode, read_dummy;
>> + u8 read_data_mask, data_byte, map_id;
>> +
>> + addr_width = nor->addr_width;
>> + read_dummy = nor->read_dummy;
>> + read_opcode = nor->read_opcode;
>> +
>> + map_id = 0;
>> + i = 0;
>> + /* Determine if there are any optional Detection Command Descriptors */
>> + while (!(smpt[i] & SMPT_DESC_TYPE_MAP)) {
>> + read_data_mask = SMPT_CMD_READ_DATA(smpt[i]);
>> + nor->addr_width = spi_nor_smpt_addr_width(nor, smpt[i]);
>> + nor->read_dummy = spi_nor_smpt_read_dummy(nor, smpt[i]);
>> + nor->read_opcode = SMPT_CMD_OPCODE(smpt[i]);
>> + addr = smpt[i + 1];
>> +
>> + err = spi_nor_read_raw(nor, addr, 1, &data_byte);
>> + if (err)
>> + goto out;
>> +
>> + /*
>> + * Build an index value that is used to select the Sector Map
>> + * Configuration that is currently in use.
>> + */
>> + map_id = map_id << 1 | (!(data_byte & read_data_mask) ? 0 : 1);
>
> You can drop the ternary operator part completely ^

I'll use !! instead.

>
>> + i = i + 2;
>> + }
>> +
>> + /* Find the matching configuration map */
>> + while (SMPT_MAP_ID(smpt[i]) != map_id) {
>> + if (smpt[i] & SMPT_DESC_END)
>> + goto out;
>> + /* increment the table index to the next map */
>> + i += SMPT_MAP_REGION_COUNT(smpt[i]) + 1;
>> + }
>> +
>> + ret = smpt + i;
>> + /* fall through */
>> +out:
>> + nor->addr_width = addr_width;
>> + nor->read_dummy = read_dummy;
>> + nor->read_opcode = read_opcode;
>> + return ret;
>> +}
>> +
>> +static void
>> +spi_nor_region_check_overlay(struct spi_nor_erase_region *region,
>> + const struct spi_nor_erase_type *erase,
>> + const u8 erase_type)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
>> + if (!(erase_type & BIT(i)))
>> + continue;
>> + if (region->size & erase[i].size_mask) {
>> + spi_nor_region_mark_overlay(region);
>> + return;
>> + }
>> + }
>> +}
>> +
>> +static int spi_nor_init_non_uniform_erase_map(struct spi_nor *nor,
>> + const u32 *smpt)
>> +{
>> + struct spi_nor_erase_map *map = &nor->erase_map;
>> + const struct spi_nor_erase_type *erase = map->erase_type;
>> + struct spi_nor_erase_region *region;
>> + u64 offset;
>> + u32 region_count;
>> + int i, j;
>> + u8 erase_type;
>> +
>> + region_count = SMPT_MAP_REGION_COUNT(*smpt);
>> + region = devm_kcalloc(nor->dev, region_count, sizeof(*region),
>> + GFP_KERNEL);
>
> Is this memory always correctly free'd ?

Yes. It will be free'd when the driver detaches from the device.

Thanks,
ta

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