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mtd: spi-nor: stm32-quadspi: Fix uninitialized error return code 

With gcc 4.1.2:

    drivers/mtd/spi-nor/stm32-quadspi.c: In function ‘stm32_qspi_tx_poll’:
    drivers/mtd/spi-nor/stm32-quadspi.c:230: warning: ‘ret’ may be used uninitialized in this function

Indeed, if stm32_qspi_cmd.len is zero, ret will be uninitialized.
This length is passed from outside the driver using the
spi_nor.{read,write}{,_reg}() callbacks.

Several functions in drivers/mtd/spi-nor/spi-nor.c (e.g. write_enable(),
write_disable(), and erase_chip()) call spi_nor.write_reg() with a zero
length.

Fix this by returning an explicit zero on success.

Fixes: 0d43d7ab27 ("mtd: spi-nor: add driver for STM32 quad spi flash controller")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>
This commit is contained in:
Geert Uytterhoeven 2017-10-26 17:12:33 +02:00 committed by Cyrille Pitchen
parent b8cc001291
commit 05521bd3d1
1 changed files with 2 additions and 2 deletions
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4
drivers/mtd/spi-nor/stm32-quadspi.c
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@ -240,12 +240,12 @@ static int stm32_qspi_tx_poll(struct stm32_qspi *qspi,
STM32_QSPI_FIFO_TIMEOUT_US);
if (ret) {
dev_err(qspi->dev, "fifo timeout (stat:%#x)\n", sr);
break;
return ret;
}
tx_fifo(buf++, qspi->io_base + QUADSPI_DR);
}
return ret;
return 0;
}
static int stm32_qspi_tx_mm(struct stm32_qspi *qspi,