Re: [Bug 206175] Fedora >= 5.4 kernels instantly freeze on boot without producing any display output

[Christoph Hellwig]

FYI, Linus' latest rant shows up in bugzilla, but never made it to me,
just as the other replies from Artem and Hans.  This just shows how
broken bugzilla is as a reporting tool.  Please be a little more calm,
I've always taken reported regressions series and as a first priority,
but it really does not help if information is hidden away.  Adding
Artem to the Cc list and drop bugzilla to make this work a bit better.

Artem, can you test the patch below?  This fixes the broken dma_mask
handling in platform_device_register_full that could override a
perfectly valid mask with 0.  If this doesn't work, can you throw
in a dump_stack() into the working kernel build to see where
platform_device_register_full and setup_pdev_dma_masks get called
for your system?

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 7fa654f1288b..03035661eb6b 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -662,19 +662,6 @@ struct platform_device *platform_device_register_full(
 	pdev->dev.of_node_reused = pdevinfo->of_node_reused;
 
 	if (pdevinfo->dma_mask) {
-		/*
-		 * This memory isn't freed when the device is put,
-		 * I don't have a nice idea for that though.  Conceptually
-		 * dma_mask in struct device should not be a pointer.
-		 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
-		 */
-		pdev->dev.dma_mask =
-			kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
-		if (!pdev->dev.dma_mask)
-			goto err;
-
-		kmemleak_ignore(pdev->dev.dma_mask);
-
 		*pdev->dev.dma_mask = pdevinfo->dma_mask;
 		pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
 	}