diff options
| author | David Brownell <dbrownell@users.sourceforge.net> | 2008-01-09 00:32:40 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-09 01:10:35 +0100 |
| commit | d52df2e2ea2d881b1439bbdec7f67c27e0f47941 (patch) | |
| tree | a2035b8336b49e868aa27fec4ecb21294db6cb08 /drivers/spi/spi_bitbang.c | |
| parent | x86: fix do_fork_idle section mismatch (diff) | |
| download | linux-d52df2e2ea2d881b1439bbdec7f67c27e0f47941.tar.xz linux-d52df2e2ea2d881b1439bbdec7f67c27e0f47941.zip | |
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 <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi/spi_bitbang.c')
| -rw-r--r-- | drivers/spi/spi_bitbang.c | 5 |
1 files 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; } |