linux-kernel - [PATCH] media: mtk-vcodec: make IRQs disabled upon request

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Date:   Fri, 21 Aug 2020 20:19:23 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>
Cc:     linux-media@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Alexandre Courbot <acourbot@...omium.org>,
        Ezequiel Garcia <ezequiel@...labora.com>
Subject: [PATCH] media: mtk-vcodec: make IRQs disabled upon request

The driver requests IRQs to disable them immediately. This is
potentially racy, fix this by requesting the IRQs to come disabled
instead using the IRQ_NOAUTOEN flag of irq_set_status_flags().

Reported-by: Ezequiel Garcia <ezequiel@...labora.com>
Signed-off-by: Alexandre Courbot <acourbot@...omium.org>
---
The "media: mtk-vcodec: venc: support for MT8183" happens to change this
part of the code, this version applies on top of it (but adapting it to
the media ToT is trivial). If preferred I can include this one on top of
the series on its next respin, even though it also touches the decoder.

 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c | 2 +-
 drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
index 5b5765b98e57..a6ba342f7bc8 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
@@ -259,6 +259,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 	}
 
 	dev->dec_irq = platform_get_irq(pdev, 0);
+	irq_set_status_flags(dev->dec_irq, IRQ_NOAUTOEN);
 	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
 			mtk_vcodec_dec_irq_handler, 0, pdev->name, dev);
 	if (ret) {
@@ -268,7 +269,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 		goto err_res;
 	}
 
-	disable_irq(dev->dec_irq);
 	mutex_init(&dev->dec_mutex);
 	mutex_init(&dev->dev_mutex);
 	spin_lock_init(&dev->irqlock);
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
index d6438cb4eead..2a4136e6e867 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
@@ -311,6 +311,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 	}
 
 	dev->enc_irq = platform_get_irq(pdev, 0);
+	irq_set_status_flags(dev->enc_irq, IRQ_NOAUTOEN);
 	ret = devm_request_irq(&pdev->dev, dev->enc_irq,
 			       mtk_vcodec_enc_irq_handler,
 			       0, pdev->name, dev);
@@ -321,7 +322,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 		ret = -EINVAL;
 		goto err_res;
 	}
-	disable_irq(dev->enc_irq);
 
 	if (dev->venc_pdata->has_lt_irq) {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
@@ -333,6 +333,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 		mtk_v4l2_debug(2, "reg[%d] base=0x%p", i, dev->reg_base[VENC_LT_SYS]);
 
 		dev->enc_lt_irq = platform_get_irq(pdev, 1);
+		irq_set_status_flags(dev->enc_lt_irq, IRQ_NOAUTOEN);
 		ret = devm_request_irq(&pdev->dev,
 				       dev->enc_lt_irq,
 				       mtk_vcodec_enc_lt_irq_handler,
@@ -344,7 +345,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 			ret = -EINVAL;
 			goto err_res;
 		}
-		disable_irq(dev->enc_lt_irq); /* VENC_LT */
 	}
 
 	mutex_init(&dev->enc_mutex);
-- 
2.28.0.297.g1956fa8f8d-goog