On Mon, Feb 17, 2020 at 06:28:02PM -0800, Prabhakar Kushwaha wrote:
device_shutdown() called from reboot or power_shutdown expect all devices to be shutdown. Same is true for even ahci pci driver. As no ahci shutdown function is implemented, the ata subsystem always remains alive with DMA & interrupt support. File system related calls should not be honored after device_shutdown().
So defining ahci pci driver shutdown to freeze hardware (mask interrupt, stop DMA engine and free DMA resources).
Signed-off-by: Prabhakar Kushwaha pkushwaha@marvell.com Signed-off-by: Jens Axboe axboe@kernel.dk
This problem has also been seen on older kernel. So sending to stable@vger.kernel.org Note: It is already applied to git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git with commit id: 10a663a1b151 ("ata: ahci: Add shutdown to freeze hardware resources of ahci")
So what kernel(s) do you wish to have this commit backported to?
thanks,
greg k-h