Commits
Dan Williams committed a3e9af95f79
libnvdimm: restore "libnvdimm: band aid btt vs clear poison locking" This continues the 4.11 status quo of disabling of error clearing from the BTT I/O path. Toshi found that even though we have eliminated all the libnvdimm sources of sleeping-while-atomic triggers, we still have sleeping operations that will occur in the path to send the ACPI DSM to the DIMM to clear the error: BUG: sleeping function called from invalid context at mm/slab.h:432 in_atomic(): 1, irqs_disabled(): 0, pid: 13353, name: dd Call Trace: dump_stack+0x86/0xc3 ___might_sleep+0x17d/0x250 __might_sleep+0x4a/0x80 __kmalloc+0x1c0/0x2e0 acpi_os_allocate_zeroed+0x2d/0x2f acpi_evaluate_object+0x59/0x3b1 acpi_evaluate_dsm+0xbd/0x10c acpi_nfit_ctl+0x1ef/0x7c0 [nfit] ? nsio_rw_bytes+0x152/0x280 nvdimm_clear_poison+0x77/0x140 nsio_rw_bytes+0x18f/0x280 btt_write_pg+0x1d4/0x3d0 [nd_btt] btt_make_request+0x119/0x2d0 [nd_btt] A solution for tracking and handling media errors natively in the BTT is needed. Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Reported-by: Toshi Kani <toshi.kani@hpe.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>