Commit 96219c3a authored by Doug Anderson's avatar Doug Anderson Committed by Ben Dooks

i2c-tegra: fix possible race condition after tx

In tegra_i2c_fill_tx_fifo, once we have finished pushing all the bytes
to the I2C hardware controller, the interrupt might happen before we
have updated i2c_dev->msg_buf_remaining at the end of the function.
Then, in tegra_i2c_isr, we will call again tegra_i2c_fill_tx_fifo
triggering weird behaviour. This has been shown to happen under real
conditions.
Signed-off-by: default avatarDoug Anderson <dianders@chromium.org>
Tested-by: default avatarVincent Palatin <vpalatin@chromium.org>
Acked-by: default avatarRhyland Klein <rklein@nvidia.com>
Acked-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent 048e29cf
......@@ -270,14 +270,30 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
/* Rounds down to not include partial word at the end of buf */
words_to_transfer = buf_remaining / BYTES_PER_FIFO_WORD;
/* It's very common to have < 4 bytes, so optimize that case. */
if (words_to_transfer) {
if (words_to_transfer > tx_fifo_avail)
words_to_transfer = tx_fifo_avail;
/*
* Update state before writing to FIFO. If this casues us
* to finish writing all bytes (AKA buf_remaining goes to 0) we
* have a potential for an interrupt (PACKET_XFER_COMPLETE is
* not maskable). We need to make sure that the isr sees
* buf_remaining as 0 and doesn't call us back re-entrantly.
*/
buf_remaining -= words_to_transfer * BYTES_PER_FIFO_WORD;
tx_fifo_avail -= words_to_transfer;
i2c_dev->msg_buf_remaining = buf_remaining;
i2c_dev->msg_buf = buf +
words_to_transfer * BYTES_PER_FIFO_WORD;
barrier();
i2c_writesl(i2c_dev, buf, I2C_TX_FIFO, words_to_transfer);
buf += words_to_transfer * BYTES_PER_FIFO_WORD;
buf_remaining -= words_to_transfer * BYTES_PER_FIFO_WORD;
tx_fifo_avail -= words_to_transfer;
}
/*
* If there is a partial word at the end of buf, handle it manually to
......@@ -287,14 +303,15 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
if (tx_fifo_avail > 0 && buf_remaining > 0) {
BUG_ON(buf_remaining > 3);
memcpy(&val, buf, buf_remaining);
/* Again update before writing to FIFO to make sure isr sees. */
i2c_dev->msg_buf_remaining = 0;
i2c_dev->msg_buf = NULL;
barrier();
i2c_writel(i2c_dev, val, I2C_TX_FIFO);
buf_remaining = 0;
tx_fifo_avail--;
}
BUG_ON(tx_fifo_avail > 0 && buf_remaining > 0);
i2c_dev->msg_buf_remaining = buf_remaining;
i2c_dev->msg_buf = buf;
return 0;
}
......@@ -411,9 +428,10 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
tegra_i2c_mask_irq(i2c_dev, I2C_INT_TX_FIFO_DATA_REQ);
}
if ((status & I2C_INT_PACKET_XFER_COMPLETE) &&
!i2c_dev->msg_buf_remaining)
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)
......
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