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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-01-08 15:32:40 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-08 16:10:35 -0800
commitd52df2e2ea2d881b1439bbdec7f67c27e0f47941 (patch)
treea2035b8336b49e868aa27fec4ecb21294db6cb08 /drivers/spi/spi_bitbang.c
parenta2b484a29cc9f565b013c0e7f1e0cc22dec12456 (diff)
downloadop-kernel-dev-d52df2e2ea2d881b1439bbdec7f67c27e0f47941.zip
op-kernel-dev-d52df2e2ea2d881b1439bbdec7f67c27e0f47941.tar.gz
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.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c
index 81639c6..f7f8580 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;
}
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