diff options
| author | Laxman Dewangan <ldewangan@nvidia.com> | 2012-05-07 12:16:19 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-01 15:15:55 +0800 |
| commit | 88fad6c0b5f2528a32c58161cc0157a13868c095 (patch) | |
| tree | 44c7d6e8248b6e611682bd0d1fd39cef0b939772 | |
| parent | e9c769c264f57a11979b56f114183ef01402a11d (diff) | |
i2c: tegra: notify transfer-complete after clearing status.
commit c889e91d2cc22123f20f40dde0c0a91856a20eea upstream.
The notification of the transfer complete by calling complete()
should be done after clearing all interrupt status.
This avoids the race condition of misconfigure the i2c controller
in multi-core environment.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 0ab4a9548745..a54a9c272b60 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -401,8 +401,6 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id) disable_irq_nosync(i2c_dev->irq); i2c_dev->irq_disabled = 1; } - - complete(&i2c_dev->msg_complete); goto err; } @@ -411,7 +409,6 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id) i2c_dev->msg_err |= I2C_ERR_NO_ACK; if (status & I2C_INT_ARBITRATION_LOST) i2c_dev->msg_err |= I2C_ERR_ARBITRATION_LOST; - complete(&i2c_dev->msg_complete); goto err; } @@ -429,14 +426,14 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id) tegra_i2c_mask_irq(i2c_dev, I2C_INT_TX_FIFO_DATA_REQ); } + i2c_writel(i2c_dev, status, I2C_INT_STATUS); + if (i2c_dev->is_dvc) + dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS); + if (status & I2C_INT_PACKET_XFER_COMPLETE) { BUG_ON(i2c_dev->msg_buf_remaining); complete(&i2c_dev->msg_complete); } - - i2c_writel(i2c_dev, status, I2C_INT_STATUS); - if (i2c_dev->is_dvc) - dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS); return IRQ_HANDLED; err: /* An error occurred, mask all interrupts */ @@ -446,6 +443,8 @@ err: i2c_writel(i2c_dev, status, I2C_INT_STATUS); if (i2c_dev->is_dvc) dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS); + + complete(&i2c_dev->msg_complete); return IRQ_HANDLED; } |