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[ Upstream commit05521bd3d1] 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> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>