[PATCH 5.4 20/25] dmaengine: fsl-qdma: init irq after reg initialization

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

5.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Curtis Klein <curtis.klein@hpe.com>

commit 87a39071e0b639f45e05d296cc0538eef44ec0bd upstream.

Initialize the qDMA irqs after the registers are configured so that
interrupts that may have been pending from a primary kernel don't get
processed by the irq handler before it is ready to and cause panic with
the following trace:

  Call trace:
   fsl_qdma_queue_handler+0xf8/0x3e8
   __handle_irq_event_percpu+0x78/0x2b0
   handle_irq_event_percpu+0x1c/0x68
   handle_irq_event+0x44/0x78
   handle_fasteoi_irq+0xc8/0x178
   generic_handle_irq+0x24/0x38
   __handle_domain_irq+0x90/0x100
   gic_handle_irq+0x5c/0xb8
   el1_irq+0xb8/0x180
   _raw_spin_unlock_irqrestore+0x14/0x40
   __setup_irq+0x4bc/0x798
   request_threaded_irq+0xd8/0x190
   devm_request_threaded_irq+0x74/0xe8
   fsl_qdma_probe+0x4d4/0xca8
   platform_drv_probe+0x50/0xa0
   really_probe+0xe0/0x3f8
   driver_probe_device+0x64/0x130
   device_driver_attach+0x6c/0x78
   __driver_attach+0xbc/0x158
   bus_for_each_dev+0x5c/0x98
   driver_attach+0x20/0x28
   bus_add_driver+0x158/0x220
   driver_register+0x60/0x110
   __platform_driver_register+0x44/0x50
   fsl_qdma_driver_init+0x18/0x20
   do_one_initcall+0x48/0x258
   kernel_init_freeable+0x1a4/0x23c
   kernel_init+0x10/0xf8
   ret_from_fork+0x10/0x18

Cc: stable@vger.kernel.org
Fixes: b092529e0aa0 ("dmaengine: fsl-qdma: Add qDMA controller driver for Layerscape SoCs")
Signed-off-by: Curtis Klein <curtis.klein@hpe.com>
Signed-off-by: Yi Zhao <yi.zhao@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240201220406.440145-1-Frank.Li@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/dma/fsl-qdma.c |   17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

--- a/drivers/dma/fsl-qdma.c
+++ b/drivers/dma/fsl-qdma.c
@@ -1152,10 +1152,6 @@ static int fsl_qdma_probe(struct platfor
 	if (!fsl_qdma->queue)
 		return -ENOMEM;
 
-	ret = fsl_qdma_irq_init(pdev, fsl_qdma);
-	if (ret)
-		return ret;
-
 	fsl_qdma->irq_base = platform_get_irq_byname(pdev, "qdma-queue0");
 	if (fsl_qdma->irq_base < 0)
 		return fsl_qdma->irq_base;
@@ -1194,16 +1190,19 @@ static int fsl_qdma_probe(struct platfor
 
 	platform_set_drvdata(pdev, fsl_qdma);
 
-	ret = dma_async_device_register(&fsl_qdma->dma_dev);
+	ret = fsl_qdma_reg_init(fsl_qdma);
 	if (ret) {
-		dev_err(&pdev->dev,
-			"Can't register NXP Layerscape qDMA engine.\n");
+		dev_err(&pdev->dev, "Can't Initialize the qDMA engine.\n");
 		return ret;
 	}
 
-	ret = fsl_qdma_reg_init(fsl_qdma);
+	ret = fsl_qdma_irq_init(pdev, fsl_qdma);
+	if (ret)
+		return ret;
+
+	ret = dma_async_device_register(&fsl_qdma->dma_dev);
 	if (ret) {
-		dev_err(&pdev->dev, "Can't Initialize the qDMA engine.\n");
+		dev_err(&pdev->dev, "Can't register NXP Layerscape qDMA engine.\n");
 		return ret;
 	}