From 95c5c3ab7db0dcaeebeb771b90152cd47aa27243 Mon Sep 17 00:00:00 2001 From: Jarkko Nikula Date: Mon, 21 Mar 2011 16:27:30 +0200 Subject: [PATCH] spi/omap_mcspi: Fix broken last word xfer Commit adef658 "spi/omap_mcspi: catch xfers of non-multiple SPI word size" broke the transmission of last word in cases where access is multiple of word size and word size is 16 or 32 bits. Fix this by replacing the test "c > (word_len>>3)" in do-while loops with "c >= 'pointer increment size'". This ensures that the last word is transmitted in above case and still allow to break the loop and prevent variable c underflow in cases where word size != 'pointer increment size'. Signed-off-by: Jarkko Nikula Tested-by: Sourav Poddar Acked-by: Michael Jones Signed-off-by: Grant Likely --- drivers/spi/omap2_mcspi.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c index 3a5ed06d3d2f..6f86ba0175ac 100644 --- a/drivers/spi/omap2_mcspi.c +++ b/drivers/spi/omap2_mcspi.c @@ -517,7 +517,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) dev_vdbg(&spi->dev, "read-%d %02x\n", word_len, *(rx - 1)); } - } while (c > (word_len>>3)); + } while (c); } else if (word_len <= 16) { u16 *rx; const u16 *tx; @@ -564,7 +564,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) dev_vdbg(&spi->dev, "read-%d %04x\n", word_len, *(rx - 1)); } - } while (c > (word_len>>3)); + } while (c >= 2); } else if (word_len <= 32) { u32 *rx; const u32 *tx; @@ -611,7 +611,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) dev_vdbg(&spi->dev, "read-%d %08x\n", word_len, *(rx - 1)); } - } while (c > (word_len>>3)); + } while (c >= 4); } /* for TX_ONLY mode, be sure all words have shifted out */ -- 2.20.1