accel/amdxdna: Hold mm structure across iommu_sva_unbind_device()

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[ Upstream commit a9162439ad ]

Some tests trigger a crash in iommu_sva_unbind_device() due to
accessing iommu_mm after the associated mm structure has been
freed.

Fix this by taking an explicit reference to the mm structure
after successfully binding the device, and releasing it only
after the device is unbound. This ensures the mm remains valid
for the entire SVA bind/unbind lifetime.

Fixes: be462c97b7 ("accel/amdxdna: Add hardware context")
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Link: https://patch.msgid.link/20260128002356.1858122-1-lizhi.hou@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Lizhi Hou 2026-01-27 16:23:56 -08:00 • committed by Greg Kroah-Hartman

parent e6ff5e9e39

commit f6b4c1d98a

2 changed files with 4 additions and 0 deletions

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3

drivers/accel/amdxdna/amdxdna_pci_drv.c

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1

drivers/accel/amdxdna/amdxdna_pci_drv.h

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