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| author | Atsushi Nemoto <atsushi.nemoto@sord.co.jp> | 2020-05-08 16:14:36 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2020-05-20 16:28:03 +0300 |
| commit | ab1c6093f689c48bb28889b3c23888289afd5c34 (patch) | |
| tree | fa700623aa50675bf39e55848d6581db57799a2b /drivers/i2c/busses | |
| parent | f89c326dcaa0cb8c3af7764e75eeed4e3f3c879a (diff) | |
| download | linux-ab1c6093f689c48bb28889b3c23888289afd5c34.tar.xz | |
i2c: altera: cleanup spinlock
Protect altr_i2c_int_enable() by the mutex and remove unneeded spinlock.
Signed-off-by: Atsushi Nemoto <atsushi.nemoto@sord.co.jp>
Reviewed-by: Thor Thayer <thor.thayer@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c/busses')
| -rw-r--r-- | drivers/i2c/busses/i2c-altera.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/i2c/busses/i2c-altera.c b/drivers/i2c/busses/i2c-altera.c index 70c81f88b293..7d62cbda6e06 100644 --- a/drivers/i2c/busses/i2c-altera.c +++ b/drivers/i2c/busses/i2c-altera.c @@ -69,7 +69,6 @@ * @fifo_size: size of the FIFO passed in. * @isr_mask: cached copy of local ISR enables. * @isr_status: cached copy of local ISR status. - * @lock: spinlock for IRQ synchronization. * @isr_mutex: mutex for IRQ thread. */ struct altr_i2c_dev { @@ -86,18 +85,14 @@ struct altr_i2c_dev { u32 fifo_size; u32 isr_mask; u32 isr_status; - spinlock_t lock; /* IRQ synchronization */ struct mutex isr_mutex; }; static void altr_i2c_int_enable(struct altr_i2c_dev *idev, u32 mask, bool enable) { - unsigned long flags; u32 int_en; - spin_lock_irqsave(&idev->lock, flags); - int_en = readl(idev->base + ALTR_I2C_ISER); if (enable) idev->isr_mask = int_en | mask; @@ -105,8 +100,6 @@ altr_i2c_int_enable(struct altr_i2c_dev *idev, u32 mask, bool enable) idev->isr_mask = int_en & ~mask; writel(idev->isr_mask, idev->base + ALTR_I2C_ISER); - - spin_unlock_irqrestore(&idev->lock, flags); } static void altr_i2c_int_clear(struct altr_i2c_dev *idev, u32 mask) @@ -346,6 +339,7 @@ static int altr_i2c_xfer_msg(struct altr_i2c_dev *idev, struct i2c_msg *msg) time_left = wait_for_completion_timeout(&idev->msg_complete, ALTR_I2C_XFER_TIMEOUT); + mutex_lock(&idev->isr_mutex); altr_i2c_int_enable(idev, imask, false); value = readl(idev->base + ALTR_I2C_STATUS) & ALTR_I2C_STAT_CORE; @@ -358,6 +352,7 @@ static int altr_i2c_xfer_msg(struct altr_i2c_dev *idev, struct i2c_msg *msg) } altr_i2c_core_disable(idev); + mutex_unlock(&idev->isr_mutex); return idev->msg_err; } @@ -411,7 +406,6 @@ static int altr_i2c_probe(struct platform_device *pdev) idev->dev = &pdev->dev; init_completion(&idev->msg_complete); - spin_lock_init(&idev->lock); mutex_init(&idev->isr_mutex); ret = device_property_read_u32(idev->dev, "fifo-size", @@ -449,7 +443,9 @@ static int altr_i2c_probe(struct platform_device *pdev) return ret; } + mutex_lock(&idev->isr_mutex); altr_i2c_init(idev); + mutex_unlock(&idev->isr_mutex); i2c_set_adapdata(&idev->adapter, idev); strlcpy(idev->adapter.name, pdev->name, sizeof(idev->adapter.name)); |