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authorMika Kuoppala <mika.kuoppala@nokia.com>2009-12-06 17:06:22 +0100
committerJean Delvare <khali@linux-fr.org>2009-12-06 17:06:22 +0100
commit194684e596af4bdaebb424166d94a8aa528edfda (patch)
tree1a6b0ede432e8c9fb4f7a1652deb71044ff9aa50 /drivers/i2c/Kconfig
parenta0c11cdd6a1975fd8d6d186f2e2865a82f3e9bbf (diff)
downloadlwn-194684e596af4bdaebb424166d94a8aa528edfda.tar.gz
lwn-194684e596af4bdaebb424166d94a8aa528edfda.zip
i2c: Prevent priority inversion on top of bus lock
Low priority thread holding the i2c bus mutex could block higher priority threads to access the bus resulting in unacceptable latencies. Change the mutex type to rt_mutex preventing priority inversion. Tested-by: Peter Ujfalusi <peter.ujfalusi@nokia.com> Signed-off-by: Mika Kuoppala <mika.kuoppala@nokia.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c/Kconfig')
-rw-r--r--drivers/i2c/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index d7ece131b4f4..8d8a00e5a30e 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -5,6 +5,7 @@
menuconfig I2C
tristate "I2C support"
depends on HAS_IOMEM
+ select RT_MUTEXES
---help---
I2C (pronounce: I-square-C) is a slow serial bus protocol used in
many micro controller applications and developed by Philips. SMBus,