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media: drxk_hard: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT)

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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_bus with the I2C_LOCK_SEGMENT flag. If the device does not
sit behind a mux-locked mux, the two locking variants are equivalent.

Signed-off-by: Peter Rosin <peda@axentia.se>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Peter Rosin 2018-06-20 07:17:58 +02:00 committed by Wolfram Sang
parent b1e1ca2757
commit c060a9fe07
1 changed files with 2 additions and 2 deletions
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4
drivers/media/dvb-frontends/drxk_hard.c
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@ -213,7 +213,7 @@ static inline u32 log10times100(u32 value)
static int drxk_i2c_lock(struct drxk_state *state)
{
i2c_lock_adapter(state->i2c);
i2c_lock_bus(state->i2c, I2C_LOCK_SEGMENT);
state->drxk_i2c_exclusive_lock = true;
return 0;
@ -224,7 +224,7 @@ static void drxk_i2c_unlock(struct drxk_state *state)
if (!state->drxk_i2c_exclusive_lock)
return;
i2c_unlock_adapter(state->i2c);
i2c_unlock_bus(state->i2c, I2C_LOCK_SEGMENT);
state->drxk_i2c_exclusive_lock = false;
}