From d52df2e2ea2d881b1439bbdec7f67c27e0f47941 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Tue, 8 Jan 2008 15:32:40 -0800 Subject: [PATCH] spi_bitbang: always grab lock with irqs blocked Fix a glitch reported by lockdep in the spi_bitbang code: it needs to consistently block IRQs when holding that spinlock. Signed-off-by: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/spi/spi_bitbang.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c index 81639c6be1c7..f7f8580edad8 100644 --- a/drivers/spi/spi_bitbang.c +++ b/drivers/spi/spi_bitbang.c @@ -184,6 +184,7 @@ int spi_bitbang_setup(struct spi_device *spi) struct spi_bitbang_cs *cs = spi->controller_state; struct spi_bitbang *bitbang; int retval; + unsigned long flags; bitbang = spi_master_get_devdata(spi->master); @@ -222,12 +223,12 @@ int spi_bitbang_setup(struct spi_device *spi) */ /* deselect chip (low or high) */ - spin_lock(&bitbang->lock); + spin_lock_irqsave(&bitbang->lock, flags); if (!bitbang->busy) { bitbang->chipselect(spi, BITBANG_CS_INACTIVE); ndelay(cs->nsecs); } - spin_unlock(&bitbang->lock); + spin_unlock_irqrestore(&bitbang->lock, flags); return 0; } -- 2.20.1