libnvdimm: fix potential deadlock while clearing errors

With the ACPI NFIT 'DSM' methods, acpi can be called from IO paths.
Specifically, the DSM to clear media errors is called during writes, so
that we can provide a writes-fix-errors model.

However it is easy to imagine a scenario like:
 -> write through the nvdimm driver
   -> acpi allocation
     -> writeback, causes more IO through the nvdimm driver
       -> deadlock

Fix this by using memalloc_noio_{save,restore}, which sets the GFP_NOIO
flag for the current scope when issuing commands/IOs that are expected
to clear errors.

Cc: <[email protected]>
Cc: <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Robert Moore <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Signed-off-by: Vishal Verma <[email protected]>
Signed-off-by: Dan Williams <[email protected]>

0 files changed, 0 insertions, 0 deletions