[PATCH 2/4] spi: spi-zynqmp-gqspi: add mutex locking for exec_op

[quanyang . wang]

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

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.w...@windriver.com>
Reviewed-by: Amit Kumar Mahapatra <amit.kumar-mahapa...@xilinx.com>
---
 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);
-- 
2.25.1