[PATCH v2 1/3] spi: nxp-xspi: Use reinit_completion() for repeated operations

[Felix Gu]

The driver currently calls init_completion() during every spi_mem_op.
Tchnically it may work, but it's not the recommended pattern.

According to the kernel documentation: Calling init_completion() on
the same completion object twice is most likely a bug as it
re-initializes the queue to an empty queue and enqueued tasks
could get "lost" - use reinit_completion() in that case, but be
aware of other races.

So moves the initial initialization to probe function and uses
reinit_completion() for subsequent operations.

Fixes: 29c8c00d9f9d ("spi: add driver for NXP XSPI controller")
Reviewed-by: Haibo Chen <haibo.chen@xxxxxxx>
Signed-off-by: Felix Gu <ustc.gu@xxxxxxxxx>
---
 drivers/spi/spi-nxp-xspi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-nxp-xspi.c b/drivers/spi/spi-nxp-xspi.c
index 06fcdf22990b..385302a6e62f 100644
--- a/drivers/spi/spi-nxp-xspi.c
+++ b/drivers/spi/spi-nxp-xspi.c
@@ -958,7 +958,7 @@ static int nxp_xspi_do_op(struct nxp_xspi *xspi, const struct spi_mem_op *op)
 		writel(reg, base + XSPI_RBCT);
 	}
 
-	init_completion(&xspi->c);
+	reinit_completion(&xspi->c);
 
 	/* Config the data address */
 	writel(op->addr.val + xspi->memmap_phy, base + XSPI_SFP_TG_SFAR);
@@ -1273,6 +1273,7 @@ static int nxp_xspi_probe(struct platform_device *pdev)
 
 	nxp_xspi_default_setup(xspi);
 
+	init_completion(&xspi->c);
 	ret = devm_request_irq(dev, irq,
 			nxp_xspi_irq_handler, 0, pdev->name, xspi);
 	if (ret)

-- 
2.43.0