On 3/31/22 23:20, Adrian Hunter wrote:
On 01/04/2022 1.34, Bart Van Assche wrote:
Quiescing LUNs falls outside the scope of a shutdown callback. The shutdown
callback is called from inside the reboot() system call and the reboot()
system call is called after user space has stopped accessing block devices.
Hence this patch that removes the quiescing calls from
ufshcd_wl_shutdown(). This patch makes shutdown faster since multiple
synchronize_rcu() calls are removed.
AFAIK there is nothing stopping shutdown being called during intense UFS I/O.
What happens then?
Hmm ... how could this happen? Am I perhaps misunderstanding something
about the Linux shutdown sequence?
The UFS driver is the only driver I know that tries to stop I/O from
inside its shutdown callback. I'm not aware of any other Linux kernel
driver that tries to pause I/O from inside its shutdown callback.
Thanks,
Bart.
