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Date: Mon, 10 Jun 2019 03:58:16 -0700 From: Bitan Biswas <bbiswas@...dia.com> To: Dmitry Osipenko <digetx@...il.com>, Laxman Dewangan <ldewangan@...dia.com>, Thierry Reding <treding@...dia.com>, Jonathan Hunter <jonathanh@...dia.com>, <linux-i2c@...r.kernel.org>, <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Peter Rosin <peda@...ntia.se>, Wolfram Sang <wsa@...-dreams.de> CC: Shardar Mohammed <smohammed@...dia.com>, Sowjanya Komatineni <skomatineni@...dia.com>, Mantravadi Karthik <mkarthik@...dia.com> Subject: Re: [PATCH V3 6/6] i2c: tegra: remove BUG, BUG_ON On 6/10/19 3:30 AM, Dmitry Osipenko wrote: > 10.06.2019 8:08, Bitan Biswas пишет: >> Remove redundant BUG_ON calls or replace with WARN_ON_ONCE >> as needed. Replace BUG() with error handling code. >> Define I2C_ERR_UNEXPECTED_STATUS for error handling. >> >> Signed-off-by: Bitan Biswas <bbiswas@...dia.com> >> --- >> drivers/i2c/busses/i2c-tegra.c | 18 +++++++++++------- >> 1 file changed, 11 insertions(+), 7 deletions(-) >> >> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c >> index 4dfb4c1..d9e99b4 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_UNEXPECTED_STATUS BIT(3) >> >> #define PACKET_HEADER0_HEADER_SIZE_SHIFT 28 >> #define PACKET_HEADER0_PACKET_ID_SHIFT 16 >> @@ -515,7 +516,6 @@ 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); >> val = i2c_readl(i2c_dev, I2C_RX_FIFO); >> val = cpu_to_le32(val); >> memcpy(buf, &val, buf_remaining); >> @@ -523,7 +523,6 @@ 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); >> i2c_dev->msg_buf_remaining = buf_remaining; >> i2c_dev->msg_buf = buf; >> >> @@ -581,7 +580,6 @@ 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); >> memcpy(&val, buf, buf_remaining); >> val = le32_to_cpu(val); >> >> @@ -847,10 +845,13 @@ 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) >> + if (i2c_dev->msg_buf_remaining) { >> tegra_i2c_empty_rx_fifo(i2c_dev); >> - else >> - BUG(); >> + } else { >> + dev_err(i2c_dev->dev, "unexpected rx data request\n"); >> + i2c_dev->msg_err |= I2C_ERR_UNEXPECTED_STATUS; >> + goto err; >> + } >> } >> >> if (!i2c_dev->msg_read && (status & I2C_INT_TX_FIFO_DATA_REQ)) { >> @@ -876,7 +877,10 @@ 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); >> + 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; >> > > It looks nearly ideal now, although there is still one thing that could > be improved. We're going to print a error message in a case of RX and > spew a warning on a similar case of TX, this makes code inconsistent. > Let's switch to either a error message or just a warning in both places. > Agree. I shall share the updated patch. -Thanks, Bitan
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