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SubjectApplied "spi: dw: use "smp_mb()" to avoid sending spi data error" to the spi tree
The patch

spi: dw: use "smp_mb()" to avoid sending spi data error

has been applied to the spi tree at for-5.5

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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From bfda044533b213985bc62bd7ca96f2b984d21b80 Mon Sep 17 00:00:00 2001
From: Xinwei Kong <>
Date: Fri, 3 Jan 2020 10:52:10 +0800
Subject: [PATCH] spi: dw: use "smp_mb()" to avoid sending spi data error

Because of out-of-order execution about some CPU architecture,
In this debug stage we find Completing spi interrupt enable ->
prodrucing TXEI interrupt -> running "interrupt_transfer" function
will prior to set "dw->rx and dws->rx_end" data, so this patch add
memory barrier to enable dw->rx and dw->rx_end to be visible and
solve to send SPI data error.
it will fix to this following low possibility error in testing environment
which using SPI control to connect TPM Modules

kernel: tpm tpm0: Operation Timed out
kernel: tpm tpm0: tpm_relinquish_locality: : error -1

Signed-off-by: fengsheng <>
Signed-off-by: Xinwei Kong <>
Signed-off-by: Mark Brown <>
drivers/spi/spi-dw.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index c547ae38ed69..310492e21b33 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -297,6 +297,9 @@ static int dw_spi_transfer_one(struct spi_controller *master,
dws->len = transfer->len;
spin_unlock_irqrestore(&dws->buf_lock, flags);

+ /* Ensure dw->rx and dw->rx_end are visible */
+ smp_mb();
spi_enable_chip(dws, 0);

/* Handle per transfer options for bpw and speed */
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