[bug report] fpga: lattice machxo2: Add Lattice MachXO2 support

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

Hello Paolo Pisati,

The patch 88fb3a002330: "fpga: lattice machxo2: Add Lattice MachXO2
support" from Apr 16, 2018, leads to the following static checker
warning:

	drivers/fpga/machxo2-spi.c:229 machxo2_write_init()
	warn: missing error code 'ret'

	drivers/fpga/machxo2-spi.c:316 machxo2_write_complete()
	warn: missing error code 'ret'

drivers/fpga/machxo2-spi.c
    187 static int machxo2_write_init(struct fpga_manager *mgr,
    188 			      struct fpga_image_info *info,
    189 			      const char *buf, size_t count)
    190 {
    191 	struct spi_device *spi = mgr->priv;
    192 	struct spi_message msg;
    193 	struct spi_transfer tx[3];
    194 	static const u8 enable[] = ISC_ENABLE;
    195 	static const u8 erase[] = ISC_ERASE;
    196 	static const u8 initaddr[] = LSC_INITADDRESS;
    197 	unsigned long status;
    198 	int ret;
    199 
    200 	if ((info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {
    201 		dev_err(&mgr->dev,
    202 			"Partial reconfiguration is not supported\n");
    203 		return -ENOTSUPP;
    204 	}
    205 
    206 	get_status(spi, &status);
    207 	dump_status_reg(&status);
    208 	memset(tx, 0, sizeof(tx));
    209 	spi_message_init(&msg);
    210 	tx[0].tx_buf = &enable;
    211 	tx[0].len = sizeof(enable);
    212 	tx[0].delay.value = MACHXO2_LOW_DELAY_USEC;
    213 	tx[0].delay.unit = SPI_DELAY_UNIT_USECS;
    214 	spi_message_add_tail(&tx[0], &msg);
    215 
    216 	tx[1].tx_buf = &erase;
    217 	tx[1].len = sizeof(erase);
    218 	spi_message_add_tail(&tx[1], &msg);
    219 	ret = spi_sync(spi, &msg);
    220 	if (ret)
    221 		goto fail;
    222 
    223 	ret = wait_until_not_busy(spi);
    224 	if (ret)
    225 		goto fail;
    226 
    227 	get_status(spi, &status);
    228 	if (test_bit(FAIL, &status))
--> 229 		goto fail;

Set an error code here?  The other warning is similar.

    230 	dump_status_reg(&status);
    231 
    232 	spi_message_init(&msg);
    233 	tx[2].tx_buf = &initaddr;
    234 	tx[2].len = sizeof(initaddr);
    235 	spi_message_add_tail(&tx[2], &msg);
    236 	ret = spi_sync(spi, &msg);
    237 	if (ret)
    238 		goto fail;
    239 
    240 	get_status(spi, &status);
    241 	dump_status_reg(&status);
    242 
    243 	return 0;
    244 fail:
    245 	dev_err(&mgr->dev, "Error during FPGA init.\n");
    246 
    247 	return ret;
    248 }

regards,
dan carpenter