On 2015/1/13 12:02, Brian Norris wrote:
> One more thing:
>
> On Mon, Jan 12, 2015 at 03:28:53PM +0800, Zhou Wang wrote:
>> diff --git a/drivers/mtd/nand/hisi504_nand.c
>> b/drivers/mtd/nand/hisi504_nand.c
>> new file mode 100644
>> index 0000000..2000f21
>> --- /dev/null
>> +++ b/drivers/mtd/nand/hisi504_nand.c
> ...
>> +static int hisi_nand_read_page_hwecc(struct mtd_info *mtd,
>> + struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
>> +{
>> + struct hinfc_host *host = chip->priv;
>> + int max_bitflips = 0, stat = 0, stat_max, status_ecc;
>
> drivers/mtd/nand/hisi504_nand.c:547:34: warning: ‘stat_max’ may be used
> uninitialized in this function [-Wmaybe-uninitialized]
> int max_bitflips = 0, stat = 0, stat_max, status_ecc;
In fact, there is no chance to run "default case" there as hisi_nfc_ecc_probe
will check this and print error.
I will initialize stat_max with 0 to eliminate this warning.
> ^
>
>> + int stat_1, stat_2;
>> +
>> + chip->read_buf(mtd, buf, mtd->writesize);
>> + chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
>> +
>> + /* errors which can not be corrected by ECC */
>> + if (host->irq_status & HINFC504_INTS_UE) {
>> + mtd->ecc_stats.failed++;
>> + } else if (host->irq_status & HINFC504_INTS_CE) {
>> + /* TODO: need add other ECC modes! */
>
> You may want a 'default' case that sets stat_max to zero, then.
>
>> + switch (chip->ecc.strength) {
>> + case 1:
>> + stat = hweight8(hinfc_read(host, HINFC504_ECC_STATUS)>>
>> + HINFC504_ECC_1_BIT_SHIFT);
>> + stat_max = 1;
>> + break;
>> + case 16:
>> + status_ecc = hinfc_read(host, HINFC504_ECC_STATUS) >>
>> + HINFC504_ECC_16_BIT_SHIFT & 0x0fff;
>> + stat_2 = status_ecc & 0x3f;
>> + stat_1 = status_ecc >> 6 & 0x3f;
>> + stat = stat_1 + stat_2;
>> + stat_max = max_t(int, stat_1, stat_2);
>> + }
>> + mtd->ecc_stats.corrected += stat;
>> + max_bitflips = max_t(int, max_bitflips, stat_max);
>> + }
>> + host->irq_status = 0;
>> +
>> + return max_bitflips;
>> +}
>
> Brian
Thanks for your comment!
Zhou Wang
>
> .
>
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