Hi, This is intended as a submission to LTSI-4.14. It is the backport of a fixes for safe DMA buffer handling for the SH-Mobile I2C driver and I2C code. All patches are present in v4.19-rc3. This pull-request is based on "[GIT PULL LTSI-4.14] LTSI-v4.14 Backport or I2C R-Car Fix" tagged as backport/v4.14.61/snapshot-to-v4.18+fixes-flattened, which I have already sent a pull-request for. There are 10 patches. I have performed build testing of this backports on a wide range of defconfigs and I am not aware of any regressions over v4.14.40 (the baseline chosen when this work began). The following changes since commit 4d4605e5c137ed9a53582e573118cbc16b82cbf1: i2c: rcar: implement STOP and REP_START according to docs (2018-08-28 13:35:06 +0200) are available in the git repository at: https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-backport.git backport/v4.14.61/snapshot-to-v4.18+fixes-v2-flattened for you to fetch changes up to 720043a4efbb3356db116d084c7b877ad41ee51a: i2c: sh_mobile: fix leak when using DMA bounce buffer (2018-09-17 15:54:30 +0200) ---------------------------------------------------------------- Second Round of LTSI-v4.14 Backports of I2C R-Car Fixes Base: * v4.14.61 * Backports of components for Renesas SoCs to v4.18 * First round of Backports of I2C R-Car Fixes Backport of post-v4.18 fix for i2c-shmobile and I2C core The focus of these fixes is to make DMA buffer handling safe ---------------------------------------------------------------- Peter Rosin (1): i2c: smbus: kill memory leak on emulated and failed DMA SMBus xfers Wenwen Wang (1): i2c: core: smbus: fix a potential missing-check bug Wolfram Sang (8): i2c: dev: mark RDWR buffers as DMA_SAFE i2c: refactor i2c_master_{send_recv} i2c: add i2c_master_{send|recv}_dmasafe i2c: smbus: use DMA safe buffers for emulated SMBus transactions i2c: add docs to clarify DMA handling i2c: refactor function to release a DMA safe buffer i2c: sh_mobile: define start_ch() void as it only returns 0 anyhow i2c: sh_mobile: fix leak when using DMA bounce buffer Documentation/i2c/DMA-considerations | 71 ++++++++++++++++++++++++++++++++++ drivers/i2c/busses/i2c-sh_mobile.c | 15 ++++---- drivers/i2c/i2c-core-base.c | 75 ++++++++++++------------------------ drivers/i2c/i2c-core-smbus.c | 57 ++++++++++++++++++++++----- drivers/i2c/i2c-dev.c | 2 + include/linux/i2c.h | 68 +++++++++++++++++++++++++++++--- 6 files changed, 215 insertions(+), 73 deletions(-) create mode 100644 Documentation/i2c/DMA-considerations
