[PATCH 5.11 269/601] spi: spi-zynqmp-gqspi: add mutex locking for exec_op

Greg Kroah-Hartman
2021-05-12T17:22:14Z

From: Quanyang Wang <quanyang.wang@windriver.com>

[ Upstream commit a0f65be6e880a14d3445b75e7dc03d7d015fc922 ]

The spi-mem framework has no locking to prevent ctlr->mem_ops->exec_op
from concurrency. So add the locking to zynqmp_qspi_exec_op.

Fixes: 1c26372e5aa9 ("spi: spi-zynqmp-gqspi: Update driver to use spi-mem framework")
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Reviewed-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
Link: https://lore.kernel.org/r/20210408040223.23134-3-quanyang.wang@windriver.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/spi/spi-zynqmp-gqspi.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index d49ab6575553..3b39461d58b3 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -173,6 +173,7 @@ struct zynqmp_qspi {
u32 genfifoentry;
enum mode_type mode;
struct completion data_completion;
+ struct mutex op_lock;
};

/**
@@ -951,6 +952,7 @@ static int zynqmp_qspi_exec_op(struct spi_mem *mem,
op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
op->dummy.buswidth, op->data.buswidth);

+ mutex_lock(&xqspi->op_lock);
zynqmp_qspi_config_op(xqspi, mem->spi);
zynqmp_qspi_chipselect(mem->spi, false);
genfifoentry |= xqspi->genfifocs;
@@ -1084,6 +1086,7 @@ static int zynqmp_qspi_exec_op(struct spi_mem *mem,
return_err:

zynqmp_qspi_chipselect(mem->spi, true);
+ mutex_unlock(&xqspi->op_lock);

return err;
}
@@ -1156,6 +1159,8 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
goto clk_dis_pclk;
}

+ mutex_init(&xqspi->op_lock);
+
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
pm_runtime_set_active(&pdev->dev);
--
2.30.2