[Linaro-mm-sig] Re: [PATCH v12 2/5] drm/gem/shmem: Introduce __drm_gem_shmem_free_sgt_locked()

On Tue, 2026-04-21 at 19:52 -0400, Lyude Paul wrote:

+/**

• • __drm_gem_shmem_release_sgt_locked - Unpin and DMA unmap pages,

and release the

• • cached scatter/gather table for an shmem GEM object.

It appears that I misnamed the function in this somehow still, so I will make note of this and make sure that it gets fixed in the next respin of this series

• • @shmem: shmem GEM object
• • If the passed shmem object has an active scatter/gather table for

driver

• • usage, this function will unmap it and release the memory

associated with it.

• • It is the responsibility of the caller to ensure it holds the

dma_resv_lock

• • for this object.
• • Drivers should not need to call this function themselves, it is

mainly

• • intended for usage in the Rust shmem bindings.
• */

+void __drm_gem_shmem_free_sgt_locked(struct drm_gem_shmem_object *shmem) +{

• dma_resv_assert_held(shmem->base.resv);
• dma_unmap_sgtable(shmem->base.dev->dev, shmem->sgt,

DMA_BIDIRECTIONAL, 0);

• sg_free_table(shmem->sgt);
• kfree(shmem->sgt);
• shmem->sgt = NULL;

+} +EXPORT_SYMBOL_GPL(__drm_gem_shmem_free_sgt_locked);