6.5-stable review patch. If anyone has any objections, please let me know.
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From: William A. Kennington III william@wkennington.com
[ Upstream commit 92e73d807b68b2214fcafca4e130b5300a9d4b3c ]
Sometimes, our completions race with new master transfers and override the bus->operation and bus->master_or_slave variables. This causes transactions to timeout and kernel crashes less frequently.
To remedy this, we re-order all completions to the very end of the function.
Fixes: 56a1485b102e ("i2c: npcm7xx: Add Nuvoton NPCM I2C controller driver") Signed-off-by: William A. Kennington III william@wkennington.com Reviewed-by: Tali Perry tali.perry1@gmail.com Signed-off-by: Wolfram Sang wsa@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/i2c/busses/i2c-npcm7xx.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-)
diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c index 53b65ffb6a647..bf9dbab52d228 100644 --- a/drivers/i2c/busses/i2c-npcm7xx.c +++ b/drivers/i2c/busses/i2c-npcm7xx.c @@ -695,6 +695,7 @@ static void npcm_i2c_callback(struct npcm_i2c *bus, { struct i2c_msg *msgs; int msgs_num; + bool do_complete = false;
msgs = bus->msgs; msgs_num = bus->msgs_num; @@ -723,23 +724,17 @@ static void npcm_i2c_callback(struct npcm_i2c *bus, msgs[1].flags & I2C_M_RD) msgs[1].len = info; } - if (completion_done(&bus->cmd_complete) == false) - complete(&bus->cmd_complete); - break; - + do_complete = true; + break; case I2C_NACK_IND: /* MASTER transmit got a NACK before tx all bytes */ bus->cmd_err = -ENXIO; - if (bus->master_or_slave == I2C_MASTER) - complete(&bus->cmd_complete); - + do_complete = true; break; case I2C_BUS_ERR_IND: /* Bus error */ bus->cmd_err = -EAGAIN; - if (bus->master_or_slave == I2C_MASTER) - complete(&bus->cmd_complete); - + do_complete = true; break; case I2C_WAKE_UP_IND: /* I2C wake up */ @@ -753,6 +748,8 @@ static void npcm_i2c_callback(struct npcm_i2c *bus, if (bus->slave) bus->master_or_slave = I2C_SLAVE; #endif + if (do_complete) + complete(&bus->cmd_complete); }
static u8 npcm_i2c_fifo_usage(struct npcm_i2c *bus)