[DragonFlyBSD - Bug #3428] (Feedback) drm: dma-buf reference imbalance freezes VA/EGL cleanup

[sigttou]

Issue #3428 has been updated by sigttou.

Status changed from New to Feedback

Confirmed: drm98.patch fixes the VA-API/EGL cleanup freeze on Intel UHD 630. My two dma-buf reference changes are already included, so the separate patch is no longer needed. This issue can be closed.

https://apollo.backplane.com/DFlyMisc/drm98.patch

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Bug #3428: drm: dma-buf reference imbalance freezes VA/EGL cleanup
http://bugs.dragonflybsd.org/issues/3428#change-14719

* Author: sigttou
* Status: Feedback
* Priority: Normal
* Category: Driver
* Target version: 6.6
* Start date: 2026-10-01
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dma_buf_get() returns without retaining a file reference, but PRIME import
later drops one. Repeated imports can release the buffer prematurely.
dma_buf_fd() also leaves an extra reference after installing the descriptor.

Retain the caller's reference in dma_buf_get(). Consume the transferred
reference after successful descriptor installation in dma_buf_fd().

FreeBSD uses the same ownership rules: retain the lookup reference and drop
the extra reference after descriptor installation.
https://github.com/freebsd/drm-kmod/blob/f252a30f27d157d9c763cd408850775096a6263f/drivers/dma-buf/dma-buf.c

---Files--------------------------------
0001-balance-dma-buf-file-references.patch (1.62 KB)


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