Hi Greg,
This patch has couple of dependency patches, you may drop this one from stable.
Thanks, -George
________________________________________ From: gregkh@linuxfoundation.org gregkh@linuxfoundation.org Sent: Saturday, August 11, 2018 9:48 PM To: Cherian, George; wsa@the-dreams.de Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] i2c: xlp9xx: Fix case where SSIF read transaction completes" failed to apply to 4.17-stable tree
The patch below does not apply to the 4.17-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 5eb173f5c8f3a3cdc47b3952c368f10a28c81ab8 Mon Sep 17 00:00:00 2001
From: George Cherian george.cherian@cavium.com Date: Wed, 8 Aug 2018 23:36:48 -0700 Subject: [PATCH] i2c: xlp9xx: Fix case where SSIF read transaction completes early
During ipmi stress tests we see occasional failure of transactions at the boot time. This happens in the case of a I2C_M_RECV_LEN transactions, when the read transfer completes (with the initial read length of 34) before the driver gets a chance to handle interrupts.
The current driver code expects at least 2 interrupts for I2C_M_RECV_LEN transactions. The length is updated during the first interrupt, and the buffer contents are only copied during subsequent interrupts. In case of just one interrupt, we will complete the transaction without copying out the bytes from RX fifo.
Update the code to drain the RX fifo after the length update, so that the transaction completes correctly in all cases.
Signed-off-by: George Cherian george.cherian@cavium.com Signed-off-by: Wolfram Sang wsa@the-dreams.de Cc: stable@kernel.org
diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c index 1f41a4f89c08..8a873975cf12 100644 --- a/drivers/i2c/busses/i2c-xlp9xx.c +++ b/drivers/i2c/busses/i2c-xlp9xx.c @@ -191,28 +191,43 @@ static void xlp9xx_i2c_drain_rx_fifo(struct xlp9xx_i2c_dev *priv) if (priv->len_recv) { /* read length byte */ rlen = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO); + + /* + * We expect at least 2 interrupts for I2C_M_RECV_LEN + * transactions. The length is updated during the first + * interrupt, and the buffer contents are only copied + * during subsequent interrupts. If in case the interrupts + * get merged we would complete the transaction without + * copying out the bytes from RX fifo. To avoid this now we + * drain the fifo as and when data is available. + * We drained the rlen byte already, decrement total length + * by one. + */ + + len--; if (rlen > I2C_SMBUS_BLOCK_MAX || rlen == 0) { rlen = 0; /*abort transfer */ priv->msg_buf_remaining = 0; priv->msg_len = 0; - } else { - *buf++ = rlen; - if (priv->client_pec) - ++rlen; /* account for error check byte */ - /* update remaining bytes and message length */ - priv->msg_buf_remaining = rlen; - priv->msg_len = rlen + 1; + xlp9xx_i2c_update_rlen(priv); + return; } + + *buf++ = rlen; + if (priv->client_pec) + ++rlen; /* account for error check byte */ + /* update remaining bytes and message length */ + priv->msg_buf_remaining = rlen; + priv->msg_len = rlen + 1; xlp9xx_i2c_update_rlen(priv); priv->len_recv = false; - } else { - len = min(priv->msg_buf_remaining, len); - for (i = 0; i < len; i++, buf++) - *buf = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO); - - priv->msg_buf_remaining -= len; }
+ len = min(priv->msg_buf_remaining, len); + for (i = 0; i < len; i++, buf++) + *buf = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO); + + priv->msg_buf_remaining -= len; priv->msg_buf = buf;
if (priv->msg_buf_remaining)