As pointed out in #2289, our current bus driver implementations are not thread save. A solution is proposed in #2290 (for the STM32F4 cpu). If we use that proposed solution or if we do something else - either way we need to do this for all cpus and bus drivers. This issue is for tracking the implementation status of this effort.

Thread safe bus drivers:

• cc2538
  • i2c (does not exist right know)
  • spi (does not exist right know)
• sam3x8e
  • i2c (does not exist right know)
  • spi (@PeterKietzmann) drivers/periph/spi: Implement thread safety for all SPI devices #2317
• samd21
  • i2c periph/i2c: added means to make I2C thread-safe #2323
  • spi drivers/periph/spi: Implement thread safety for all SPI devices #2317
• stm32f0
  • i2c (does not exist right know)
  • spi (@PeterKietzmann) drivers/periph/spi: Implement thread safety for all SPI devices #2317
• stm32f1
  • i2c periph/i2c: added means to make I2C thread-safe #2323
  • spi drivers/periph/spi: Implement thread safety for all SPI devices #2317
• stm32f3
  • i2c (does not exist right know)
  • spi drivers/periph/spi: Implement thread safety for all SPI devices #2317
• stm32f4
  • i2c periph/i2c: added means to make I2C thread-safe #2323
  • spi -> (merged drivers/periph/spi: added means to make SPI thread-safe #2290)
• stm32l1
  • i2c periph/i2c: added means to make I2C thread-safe #2323
  • spi drivers/periph/spi: Implement thread safety for all SPI devices #2317
• kinetis_common Support for Freescale Kinetis MCUs, kinetis_common #2265
  • i2c Support for Freescale Kinetis MCUs, kinetis_common #2265
  • spi https://github.com/jfischer-phytec-iot/RIOT/pull/11 (@gebart)

Question: do we need to make the UART thread safe?

Edit [@thomaseichinger]:
To keep things centralised I add a list of drivers needing adoption.

• SPI
  • at86rf231 drivers/periph/spi: Implement thread safety for all SPI devices #2317
  • cc110x drivers/periph/spi: Implement thread safety for all SPI devices #2317
  • nrf24l01p drivers/periph/spi: Implement thread safety for all SPI devices #2317
  • lis3dh LIS3DH accelerometer driver #2296
• I2C
  • hdc1000 (@jfischer-phytec-iot ) drivers/hdc1000: Acquire exclusive access to I2C bus and minor bug fixes #2354
  • isl29020 (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326
  • l3g4200d (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326
  • lps331ap (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326
  • mag3110 (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326
  • mma8652 (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326
  • mpl3115a2 (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326
  • srf02 (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326
  • srf08 (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326
  • tmp006 (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326
  • lsm303dlhc (@PeterKietzmann) drivers/... : Acquire exclusive access to I2C bus #2326