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* [PATCH V8] i2c: tegra: remove BUG() macro
@ 2019-06-18  4:29 ` Bitan Biswas
  0 siblings, 0 replies; 3+ messages in thread
From: Bitan Biswas @ 2019-06-18  4:29 UTC (permalink / raw)
  To: Laxman Dewangan, Thierry Reding, Jonathan Hunter, linux-i2c,
	linux-tegra, linux-kernel, Peter Rosin, Wolfram Sang,
	Dmitry Osipenko
  Cc: Shardar Mohammed, Sowjanya Komatineni, Mantravadi Karthik, Bitan Biswas

The usage of BUG() macro is generally discouraged in kernel, unless
it's a problem that results in a physical damage or loss of data.
This patch removes unnecessary BUG() macros and replaces the rest
with warning.

Signed-off-by: Bitan Biswas <bbiswas@nvidia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 49 +++++++++++++++++++++++++++++++++++-------
 1 file changed, 41 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 4dfb4c1..6fb545e 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -73,6 +73,7 @@
 #define I2C_ERR_NO_ACK				BIT(0)
 #define I2C_ERR_ARBITRATION_LOST		BIT(1)
 #define I2C_ERR_UNKNOWN_INTERRUPT		BIT(2)
+#define I2C_ERR_RX_BUFFER_OVERFLOW		BIT(3)
 
 #define PACKET_HEADER0_HEADER_SIZE_SHIFT	28
 #define PACKET_HEADER0_PACKET_ID_SHIFT		16
@@ -489,6 +490,13 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 	size_t buf_remaining = i2c_dev->msg_buf_remaining;
 	int words_to_transfer;
 
+	/*
+	 * Catch overflow due to message fully sent before
+	 * check for RX FIFO availability.
+	 */
+	if (WARN_ON_ONCE(!(i2c_dev->msg_buf_remaining)))
+		return -EINVAL;
+
 	if (i2c_dev->hw->has_mst_fifo) {
 		val = i2c_readl(i2c_dev, I2C_MST_FIFO_STATUS);
 		rx_fifo_avail = (val & I2C_MST_FIFO_STATUS_RX_MASK) >>
@@ -515,7 +523,11 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 	 * prevent overwriting past the end of buf
 	 */
 	if (rx_fifo_avail > 0 && buf_remaining > 0) {
-		BUG_ON(buf_remaining > 3);
+		/*
+		 * buf_remaining > 3 check not needed as rx_fifo_avail == 0
+		 * when (words_to_transfer was > rx_fifo_avail) earlier
+		 * in this function.
+		 */
 		val = i2c_readl(i2c_dev, I2C_RX_FIFO);
 		val = cpu_to_le32(val);
 		memcpy(buf, &val, buf_remaining);
@@ -523,7 +535,12 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 		rx_fifo_avail--;
 	}
 
-	BUG_ON(rx_fifo_avail > 0 && buf_remaining > 0);
+	/*
+	 * RX FIFO must be drained in Overflow case.
+	 */
+	if (WARN_ON_ONCE(rx_fifo_avail))
+		return -EINVAL;
+
 	i2c_dev->msg_buf_remaining = buf_remaining;
 	i2c_dev->msg_buf = buf;
 
@@ -581,7 +598,11 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
 	 * boundary and fault.
 	 */
 	if (tx_fifo_avail > 0 && buf_remaining > 0) {
-		BUG_ON(buf_remaining > 3);
+		/*
+		 * buf_remaining > 3 check not needed as tx_fifo_avail == 0
+		 * when (words_to_transfer was > tx_fifo_avail) earlier
+		 * in this function for non-zero words_to_transfer.
+		 */
 		memcpy(&val, buf, buf_remaining);
 		val = le32_to_cpu(val);
 
@@ -847,10 +868,15 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 
 	if (!i2c_dev->is_curr_dma_xfer) {
 		if (i2c_dev->msg_read && (status & I2C_INT_RX_FIFO_DATA_REQ)) {
-			if (i2c_dev->msg_buf_remaining)
-				tegra_i2c_empty_rx_fifo(i2c_dev);
-			else
-				BUG();
+			if (tegra_i2c_empty_rx_fifo(i2c_dev)) {
+				/*
+				 * Overflow error condition: message fully sent,
+				 * with no XFER_COMPLETE interrupt but hardware
+				 * asks to transfer more.
+				 */
+				i2c_dev->msg_err |= I2C_ERR_RX_BUFFER_OVERFLOW;
+				goto err;
+			}
 		}
 
 		if (!i2c_dev->msg_read && (status & I2C_INT_TX_FIFO_DATA_REQ)) {
@@ -876,7 +902,14 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 	if (status & I2C_INT_PACKET_XFER_COMPLETE) {
 		if (i2c_dev->is_curr_dma_xfer)
 			i2c_dev->msg_buf_remaining = 0;
-		BUG_ON(i2c_dev->msg_buf_remaining);
+		/*
+		 * Underflow error condition: XFER_COMPLETE before message
+		 * fully sent.
+		 */
+		if (WARN_ON_ONCE(i2c_dev->msg_buf_remaining)) {
+			i2c_dev->msg_err |= I2C_ERR_UNKNOWN_INTERRUPT;
+			goto err;
+		}
 		complete(&i2c_dev->msg_complete);
 	}
 	goto done;
-- 
2.7.4

^ permalink raw reply related	[flat|nested] 3+ messages in thread
* [PATCH V8] i2c: tegra: remove BUG() macro
@ 2019-06-18  4:29 ` Bitan Biswas
  0 siblings, 0 replies; 3+ messages in thread
From: Bitan Biswas @ 2019-06-18  4:29 UTC (permalink / raw)
  To: Laxman Dewangan, Thierry Reding, Jonathan Hunter, linux-i2c,
	linux-tegra, linux-kernel, Peter Rosin, Wolfram Sang,
	Dmitry Osipenko
  Cc: Shardar Mohammed, Sowjanya Komatineni, Mantravadi Karthik, Bitan Biswas

The usage of BUG() macro is generally discouraged in kernel, unless
it's a problem that results in a physical damage or loss of data.
This patch removes unnecessary BUG() macros and replaces the rest
with warning.

Signed-off-by: Bitan Biswas <bbiswas@nvidia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 49 +++++++++++++++++++++++++++++++++++-------
 1 file changed, 41 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 4dfb4c1..6fb545e 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -73,6 +73,7 @@
 #define I2C_ERR_NO_ACK				BIT(0)
 #define I2C_ERR_ARBITRATION_LOST		BIT(1)
 #define I2C_ERR_UNKNOWN_INTERRUPT		BIT(2)
+#define I2C_ERR_RX_BUFFER_OVERFLOW		BIT(3)
 
 #define PACKET_HEADER0_HEADER_SIZE_SHIFT	28
 #define PACKET_HEADER0_PACKET_ID_SHIFT		16
@@ -489,6 +490,13 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 	size_t buf_remaining = i2c_dev->msg_buf_remaining;
 	int words_to_transfer;
 
+	/*
+	 * Catch overflow due to message fully sent before
+	 * check for RX FIFO availability.
+	 */
+	if (WARN_ON_ONCE(!(i2c_dev->msg_buf_remaining)))
+		return -EINVAL;
+
 	if (i2c_dev->hw->has_mst_fifo) {
 		val = i2c_readl(i2c_dev, I2C_MST_FIFO_STATUS);
 		rx_fifo_avail = (val & I2C_MST_FIFO_STATUS_RX_MASK) >>
@@ -515,7 +523,11 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 	 * prevent overwriting past the end of buf
 	 */
 	if (rx_fifo_avail > 0 && buf_remaining > 0) {
-		BUG_ON(buf_remaining > 3);
+		/*
+		 * buf_remaining > 3 check not needed as rx_fifo_avail == 0
+		 * when (words_to_transfer was > rx_fifo_avail) earlier
+		 * in this function.
+		 */
 		val = i2c_readl(i2c_dev, I2C_RX_FIFO);
 		val = cpu_to_le32(val);
 		memcpy(buf, &val, buf_remaining);
@@ -523,7 +535,12 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 		rx_fifo_avail--;
 	}
 
-	BUG_ON(rx_fifo_avail > 0 && buf_remaining > 0);
+	/*
+	 * RX FIFO must be drained in Overflow case.
+	 */
+	if (WARN_ON_ONCE(rx_fifo_avail))
+		return -EINVAL;
+
 	i2c_dev->msg_buf_remaining = buf_remaining;
 	i2c_dev->msg_buf = buf;
 
@@ -581,7 +598,11 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
 	 * boundary and fault.
 	 */
 	if (tx_fifo_avail > 0 && buf_remaining > 0) {
-		BUG_ON(buf_remaining > 3);
+		/*
+		 * buf_remaining > 3 check not needed as tx_fifo_avail == 0
+		 * when (words_to_transfer was > tx_fifo_avail) earlier
+		 * in this function for non-zero words_to_transfer.
+		 */
 		memcpy(&val, buf, buf_remaining);
 		val = le32_to_cpu(val);
 
@@ -847,10 +868,15 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 
 	if (!i2c_dev->is_curr_dma_xfer) {
 		if (i2c_dev->msg_read && (status & I2C_INT_RX_FIFO_DATA_REQ)) {
-			if (i2c_dev->msg_buf_remaining)
-				tegra_i2c_empty_rx_fifo(i2c_dev);
-			else
-				BUG();
+			if (tegra_i2c_empty_rx_fifo(i2c_dev)) {
+				/*
+				 * Overflow error condition: message fully sent,
+				 * with no XFER_COMPLETE interrupt but hardware
+				 * asks to transfer more.
+				 */
+				i2c_dev->msg_err |= I2C_ERR_RX_BUFFER_OVERFLOW;
+				goto err;
+			}
 		}
 
 		if (!i2c_dev->msg_read && (status & I2C_INT_TX_FIFO_DATA_REQ)) {
@@ -876,7 +902,14 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 	if (status & I2C_INT_PACKET_XFER_COMPLETE) {
 		if (i2c_dev->is_curr_dma_xfer)
 			i2c_dev->msg_buf_remaining = 0;
-		BUG_ON(i2c_dev->msg_buf_remaining);
+		/*
+		 * Underflow error condition: XFER_COMPLETE before message
+		 * fully sent.
+		 */
+		if (WARN_ON_ONCE(i2c_dev->msg_buf_remaining)) {
+			i2c_dev->msg_err |= I2C_ERR_UNKNOWN_INTERRUPT;
+			goto err;
+		}
 		complete(&i2c_dev->msg_complete);
 	}
 	goto done;
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* Re: [PATCH V8] i2c: tegra: remove BUG() macro
  2019-06-18  4:29 ` Bitan Biswas
  (?)
@ 2019-06-18  9:13 ` Dmitry Osipenko
  -1 siblings, 0 replies; 3+ messages in thread
From: Dmitry Osipenko @ 2019-06-18  9:13 UTC (permalink / raw)
  To: Bitan Biswas, Laxman Dewangan, Thierry Reding, Jonathan Hunter,
	linux-i2c, linux-tegra, linux-kernel, Peter Rosin, Wolfram Sang
  Cc: Shardar Mohammed, Sowjanya Komatineni, Mantravadi Karthik

18.06.2019 7:29, Bitan Biswas пишет:
> The usage of BUG() macro is generally discouraged in kernel, unless
> it's a problem that results in a physical damage or loss of data.
> This patch removes unnecessary BUG() macros and replaces the rest
> with warning.
> 
> Signed-off-by: Bitan Biswas <bbiswas@nvidia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 49 +++++++++++++++++++++++++++++++++++-------
>  1 file changed, 41 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 4dfb4c1..6fb545e 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -73,6 +73,7 @@
>  #define I2C_ERR_NO_ACK				BIT(0)
>  #define I2C_ERR_ARBITRATION_LOST		BIT(1)
>  #define I2C_ERR_UNKNOWN_INTERRUPT		BIT(2)
> +#define I2C_ERR_RX_BUFFER_OVERFLOW		BIT(3)
>  
>  #define PACKET_HEADER0_HEADER_SIZE_SHIFT	28
>  #define PACKET_HEADER0_PACKET_ID_SHIFT		16
> @@ -489,6 +490,13 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
>  	size_t buf_remaining = i2c_dev->msg_buf_remaining;
>  	int words_to_transfer;
>  
> +	/*
> +	 * Catch overflow due to message fully sent before
> +	 * check for RX FIFO availability.
> +	 */
> +	if (WARN_ON_ONCE(!(i2c_dev->msg_buf_remaining)))
> +		return -EINVAL;
> +
>  	if (i2c_dev->hw->has_mst_fifo) {
>  		val = i2c_readl(i2c_dev, I2C_MST_FIFO_STATUS);
>  		rx_fifo_avail = (val & I2C_MST_FIFO_STATUS_RX_MASK) >>
> @@ -515,7 +523,11 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
>  	 * prevent overwriting past the end of buf
>  	 */
>  	if (rx_fifo_avail > 0 && buf_remaining > 0) {
> -		BUG_ON(buf_remaining > 3);
> +		/*
> +		 * buf_remaining > 3 check not needed as rx_fifo_avail == 0
> +		 * when (words_to_transfer was > rx_fifo_avail) earlier
> +		 * in this function.
> +		 */
>  		val = i2c_readl(i2c_dev, I2C_RX_FIFO);
>  		val = cpu_to_le32(val);
>  		memcpy(buf, &val, buf_remaining);
> @@ -523,7 +535,12 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
>  		rx_fifo_avail--;
>  	}
>  
> -	BUG_ON(rx_fifo_avail > 0 && buf_remaining > 0);
> +	/*
> +	 * RX FIFO must be drained in Overflow case.
> +	 */
> +	if (WARN_ON_ONCE(rx_fifo_avail))
> +		return -EINVAL;
> +

The comment is incorrect because RX FIFO is *not* drained in a case of overflow. Also,
please use a single-line comment style if multi-line is
not needed.

Let's change it to:

	/* RX FIFO must be drained, otherwise it's an Overflow case */
	if (WARN_ON_ONCE(rx_fifo_avail))
		return -EINVAL;

Otherwise looking good to me. Please address this minor comment and it should be done.
Looking forward to v9!

^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-06-18  9:13 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-18  4:29 [PATCH V8] i2c: tegra: remove BUG() macro Bitan Biswas
2019-06-18  4:29 ` Bitan Biswas
2019-06-18  9:13 ` Dmitry Osipenko

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