Re: [PATCH] sata_sx4: Check return code from pdc20621_i2c_read()

Sergei Shtylyov
2015-08-03T18:52:49Z

On 08/03/2015 09:46 PM, Tomer Barletz wrote:

> The variable spd0 might be used uninitialized when pdc20621_i2c_read()
> fails.
> This also generates a compilation warning with gcc 5.1.

> Signed-off-by: Tomer Barletz <barletz@gmail.com>
> ---
> drivers/ata/sata_sx4.c | 16 ++++++++++++----
> 1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/ata/sata_sx4.c b/drivers/ata/sata_sx4.c
> index 3a18a8a..e1c1423 100644
> --- a/drivers/ata/sata_sx4.c
> +++ b/drivers/ata/sata_sx4.c
> @@ -1238,8 +1238,12 @@ static unsigned int pdc20621_prog_dimm_global(struct ata_host *host)
> readl(mmio + PDC_SDRAM_CONTROL);
>
> /* Turn on for ECC */
> - pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
> - PDC_DIMM_SPD_TYPE, &spd0);
> + if (!pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
> + PDC_DIMM_SPD_TYPE, &spd0)) {

That won't do, you didn't fix the indentation here.

> + printk(KERN_ERR "Failed in i2c read: device=%#x, subaddr=%#x\n",
> + PDC_DIMM0_SPD_DEV_ADDRESS, PDC_DIMM_SPD_TYPE);
> + return 1;
> + }
> if (spd0 == 0x02) {
> data |= (0x01 << 16);
> writel(data, mmio + PDC_SDRAM_CONTROL);
> @@ -1380,8 +1384,12 @@ static unsigned int pdc20621_dimm_init(struct ata_host *host)
>
> /* ECC initiliazation. */
>
> - pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
> - PDC_DIMM_SPD_TYPE, &spd0);
> + if (!pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
> + PDC_DIMM_SPD_TYPE, &spd0)) {

And here.

> + printk(KERN_ERR "Failed in i2c read: device=%#x, subaddr=%#x\n",
> + PDC_DIMM0_SPD_DEV_ADDRESS, PDC_DIMM_SPD_TYPE);
> + return 1;
> + }
> if (spd0 == 0x02) {
> void *buf;
> VPRINTK("Start ECC initialization\n");

MBR, Sergei