From 804ae4380d1e76f5d81272b8a3b765f5e02fe46e Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 3 Jun 2013 15:24:53 +0200 Subject: [PATCH] spi: sirf: avoid uninitialized-use warning 24778be20 "spi: convert drivers to use bits_per_word_mask" removed the "default" statement in the spi_sirfsoc_setup_transfer switch, causing a new warning: drivers/spi/spi-sirf.c: In function 'spi_sirfsoc_setup_transfer': arch/arm/include/asm/io.h:90:2: warning: 'rxfifo_ctrl' may be used uninitialized in this function [-Wmaybe-uninitialized] asm volatile("str %1, %0" ^ drivers/spi/spi-sirf.c:364:19: note: 'rxfifo_ctrl' was declared here u32 txfifo_ctrl, rxfifo_ctrl; ^ The compiler has correctly identified that this case may happen, but since we know that things are horribly broken if bits_per_word is ever something other than the values we tested, calling BUG() is an appropriate action and tells the compiler that execution will not continue afterwards. Signed-off-by: Arnd Bergmann Cc: Stephen Warren Cc: Mark Brown Signed-off-by: Mark Brown --- drivers/spi/spi-sirf.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c index 77497be042a8..e262736f9163 100644 --- a/drivers/spi/spi-sirf.c +++ b/drivers/spi/spi-sirf.c @@ -425,6 +425,8 @@ spi_sirfsoc_setup_transfer(struct spi_device *spi, struct spi_transfer *t) rxfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) | SIRFSOC_SPI_FIFO_WIDTH_DWORD; break; + default: + BUG(); } if (!(spi->mode & SPI_CS_HIGH)) -- 2.34.1