diff options
| author | Lucas Stach <l.stach@pengutronix.de> | 2022-03-23 19:08:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-14 19:11:47 +0300 |
| commit | 19323b3671a85788569d15685c8f83a05ec48cbb (patch) | |
| tree | 301ffe998b09e2a07aa5a14ba3f3cef74a80003a /drivers | |
| parent | c12984cdb077b9042d2dc20ca18cb16a87bcc774 (diff) | |
| download | linux-19323b3671a85788569d15685c8f83a05ec48cbb.tar.xz | |
drm/etnaviv: check for reaped mapping in etnaviv_iommu_unmap_gem
commit e168c25526cd0368af098095c2ded4a008007e1b upstream.
When the mapping is already reaped the unmap must be a no-op, as we
would otherwise try to remove the mapping twice, corrupting the involved
data structures.
Cc: stable@vger.kernel.org # 5.4
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Guido Günther <agx@sigxcpu.org>
Acked-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c index 707f5c1a5874..790cbb20aaeb 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c @@ -289,6 +289,12 @@ void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context, mutex_lock(&context->lock); + /* Bail if the mapping has been reaped by another thread */ + if (!mapping->context) { + mutex_unlock(&context->lock); + return; + } + /* If the vram node is on the mm, unmap and remove the node */ if (mapping->vram_node.mm == &context->mm) etnaviv_iommu_remove_mapping(context, mapping); |