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i2c: designware: remove redundant lock
The per adapter bus_lock already projects from concurrent calls to the master_xfer callback. No need to add a driver internal lock. Also, rephrase a comment to drop mention of this lock. Reported-by: Rongrong Zou <zourongrong@gmail.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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2 changed files with 6 additions and 10 deletions
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@ -634,7 +634,6 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
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dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num);
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mutex_lock(&dev->lock);
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pm_runtime_get_sync(dev->dev);
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reinit_completion(&dev->cmd_complete);
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@ -673,11 +672,12 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
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}
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/*
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* We must disable the adapter before unlocking the &dev->lock mutex
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* below. Otherwise the hardware might continue generating interrupts
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* which in turn causes a race condition with the following transfer.
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* Needs some more investigation if the additional interrupts are
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* a hardware bug or this driver doesn't handle them correctly yet.
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* We must disable the adapter before returning and signaling the end
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* of the current transfer. Otherwise the hardware might continue
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* generating interrupts which in turn causes a race condition with
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* the following transfer. Needs some more investigation if the
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* additional interrupts are a hardware bug or this driver doesn't
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* handle them correctly yet.
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*/
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__i2c_dw_enable(dev, false);
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@ -706,7 +706,6 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
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done_nolock:
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pm_runtime_mark_last_busy(dev->dev);
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pm_runtime_put_autosuspend(dev->dev);
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mutex_unlock(&dev->lock);
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return ret;
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}
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@ -860,7 +859,6 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
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int r;
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init_completion(&dev->cmd_complete);
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mutex_init(&dev->lock);
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r = i2c_dw_init(dev);
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if (r)
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@ -36,7 +36,6 @@
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* @dev: driver model device node
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* @base: IO registers pointer
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* @cmd_complete: tx completion indicator
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* @lock: protect this struct and IO registers
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* @clk: input reference clock
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* @cmd_err: run time hadware error code
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* @msgs: points to an array of messages currently being transfered
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@ -73,7 +72,6 @@ struct dw_i2c_dev {
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struct device *dev;
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void __iomem *base;
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struct completion cmd_complete;
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struct mutex lock;
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struct clk *clk;
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u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
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struct dw_pci_controller *controller;
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