[PATCH] drivers: spi: sunxi: Enable irq after the initialization is done

[qianfanguijin@xxxxxxx]

From: qianfan Zhao <qianfanguijin@xxxxxxx>

Interrupts are opened prematurely before some initialization work is finished.
When some uninitialized variables are used in interrupt functions,
the kernel crashes.

A typical case is the second kernel loaded with kdump starting when the first
kernel transfering spi messages.

The kernel error messages is as follows:

[    1.362449] sun6i-spi 1c06000.spi: Failed to request RX DMA channel
[    1.369654] 8<--- cut here ---
[    1.372716] Unable to handle kernel paging request at virtual address fffffffc
[    1.379928] pgd = (ptrval)
[    1.382632] [fffffffc] *pgd=6bef6861, *pte=00000000, *ppte=00000000
[    1.388907] Internal error: Oops: 37 [#1] SMP ARM
...
[    1.784024] [<c0159c54>] (swake_up_locked.part.0) from [<c0159d9c>] (complete+0x30/0x40)
[    1.792114] [<c0159d9c>] (complete) from [<c0491ab0>] (sun6i_spi_handler+0x168/0x194)
[    1.799947] [<c0491ab0>] (sun6i_spi_handler) from [<c0169070>] (__handle_irq_event_percpu+0x50/0x120)
[    1.809168] [<c0169070>] (__handle_irq_event_percpu) from [<c0169170>] (handle_irq_event_percpu+0x30/0x78)
[    1.818818] [<c0169170>] (handle_irq_event_percpu) from [<c01691fc>] (handle_irq_event+0x44/0x68)
[    1.827687] [<c01691fc>] (handle_irq_event) from [<c016d96c>] (handle_fasteoi_irq+0xac/0x118)
[    1.836210] [<c016d96c>] (handle_fasteoi_irq) from [<c01689bc>] (handle_domain_irq+0x5c/0x78)
[    1.844731] [<c01689bc>] (handle_domain_irq) from [<c03bc058>] (gic_handle_irq+0x7c/0x90)
[    1.852910] [<c03bc058>] (gic_handle_irq) from [<c0100afc>] (__irq_svc+0x5c/0x78)

Signed-off-by: qianfan Zhao <qianfanguijin@xxxxxxx>
---
 drivers/spi/spi-sun4i.c | 4 +++-
 drivers/spi/spi-sun6i.c | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
index 1fdfc6e6691d..2f797b903692 100644
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c
@@ -452,7 +452,7 @@ static int sun4i_spi_probe(struct platform_device *pdev)
 	}
 
 	ret = devm_request_irq(&pdev->dev, irq, sun4i_spi_handler,
-			       0, "sun4i-spi", sspi);
+			       IRQF_NO_AUTOEN, "sun4i-spi", sspi);
 	if (ret) {
 		dev_err(&pdev->dev, "Cannot request IRQ\n");
 		goto err_free_master;
@@ -506,6 +506,8 @@ static int sun4i_spi_probe(struct platform_device *pdev)
 		goto err_pm_disable;
 	}
 
+	enable_irq(irq);
+
 	return 0;
 
 err_pm_disable:
diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
index 1151d8592656..0eec2d0e312b 100644
--- a/drivers/spi/spi-sun6i.c
+++ b/drivers/spi/spi-sun6i.c
@@ -583,7 +583,7 @@ static int sun6i_spi_probe(struct platform_device *pdev)
 	}
 
 	ret = devm_request_irq(&pdev->dev, irq, sun6i_spi_handler,
-			       0, "sun6i-spi", sspi);
+			       IRQF_NO_AUTOEN, "sun6i-spi", sspi);
 	if (ret) {
 		dev_err(&pdev->dev, "Cannot request IRQ\n");
 		goto err_free_master;
@@ -675,6 +675,8 @@ static int sun6i_spi_probe(struct platform_device *pdev)
 		goto err_pm_disable;
 	}
 
+	enable_irq(irq);
+
 	return 0;
 
 err_pm_disable:
-- 
2.25.1