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pdsc_teardown() frees DMA buffers but does not disable bus mastering, leaving the device able to perform DMA after the buffers are freed. This can lead to use-after-free if the device writes to freed memory. Add pci_clear_master() to pdsc_teardown() to disable bus mastering before freeing resources, ensuring all DMA is quiesced. Add pci_set_master() to pdsc_setup() to re-enable bus mastering, which is needed for the firmware recovery path since pdsc_teardown() now disables it. Signed-off-by: Nikhil P. Rao <nikhil.rao@amd.com> Link: https://patch.msgid.link/20260604213637.3844317-1-nikhil.rao@amd.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>