[PATCH 10/11] mfd: 88pm860x-i2c: switch to i2c_lock_segment
From: Peter Rosin <hidden>
Date: 2018-06-15 10:17:04
Also in:
linux-i2c, linux-iio, linux-input, linux-integrity, linux-media, linux-samsung-soc, linux-tegra, lkml
Subsystem:
multifunction devices (mfd), the rest · Maintainers:
Lee Jones, Linus Torvalds
Locking the root adapter for __i2c_transfer will deadlock if the device sits behind a mux-locked I2C mux. Switch to the finer-grained i2c_lock_segment. If the device does not sit behind a mux-locked mux, the two locking variants are equivalent. Signed-off-by: Peter Rosin <redacted> --- drivers/mfd/88pm860x-i2c.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/mfd/88pm860x-i2c.c b/drivers/mfd/88pm860x-i2c.c
index 84e313107233..8e54fc2dc29c 100644
--- a/drivers/mfd/88pm860x-i2c.c
+++ b/drivers/mfd/88pm860x-i2c.c@@ -146,14 +146,14 @@ int pm860x_page_reg_write(struct i2c_client *i2c, int reg, unsigned char zero; int ret; - i2c_lock_adapter(i2c->adapter); + i2c_lock_segment(i2c->adapter); read_device(i2c, 0xFA, 0, &zero); read_device(i2c, 0xFB, 0, &zero); read_device(i2c, 0xFF, 0, &zero); ret = write_device(i2c, reg, 1, &data); read_device(i2c, 0xFE, 0, &zero); read_device(i2c, 0xFC, 0, &zero); - i2c_unlock_adapter(i2c->adapter); + i2c_unlock_segment(i2c->adapter); return ret; } EXPORT_SYMBOL(pm860x_page_reg_write);
@@ -164,14 +164,14 @@ int pm860x_page_bulk_read(struct i2c_client *i2c, int reg, unsigned char zero = 0; int ret; - i2c_lock_adapter(i2c->adapter); + i2c_lock_segment(i2c->adapter); read_device(i2c, 0xfa, 0, &zero); read_device(i2c, 0xfb, 0, &zero); read_device(i2c, 0xff, 0, &zero); ret = read_device(i2c, reg, count, buf); read_device(i2c, 0xFE, 0, &zero); read_device(i2c, 0xFC, 0, &zero); - i2c_unlock_adapter(i2c->adapter); + i2c_unlock_segment(i2c->adapter); return ret; } EXPORT_SYMBOL(pm860x_page_bulk_read);
--
2.11.0