commit 7a02c193298ec15f2ba1344b6bcd5d578a41b2e0
Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date:   Thu Jan 9 10:25:53 2020 +0100

    Linux 5.4.10

commit d7742abfe65263b2e683380bca1686657677cf04
Author: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Date:   Wed Dec 4 10:59:09 2019 +0530

    powerpc/pmem: Fix kernel crash due to wrong range value usage in flush_dcache_range
    
    commit 6f4679b956741d2da6ad3ebb738cbe1264ac8781 upstream.
    
    This patch fix the below kernel crash.
    
     BUG: Unable to handle kernel data access on read at 0xc000000380000000
     Faulting instruction address: 0xc00000000008b6f0
    cpu 0x5: Vector: 300 (Data Access) at [c0000000d8587790]
        pc: c00000000008b6f0: arch_remove_memory+0x150/0x210
        lr: c00000000008b720: arch_remove_memory+0x180/0x210
        sp: c0000000d8587a20
       msr: 800000000280b033
       dar: c000000380000000
     dsisr: 40000000
      current = 0xc0000000d8558600
      paca    = 0xc00000000fff8f00   irqmask: 0x03   irq_happened: 0x01
        pid   = 1220, comm = ndctl
    enter ? for help
     memunmap_pages+0x33c/0x410
     devm_action_release+0x30/0x50
     release_nodes+0x30c/0x3a0
     device_release_driver_internal+0x178/0x240
     unbind_store+0x74/0x190
     drv_attr_store+0x44/0x60
     sysfs_kf_write+0x74/0xa0
     kernfs_fop_write+0x1b0/0x260
     __vfs_write+0x3c/0x70
     vfs_write+0xe4/0x200
     ksys_write+0x7c/0x140
     system_call+0x5c/0x68
    
    Fixes: 076265907cf9 ("powerpc: Chunk calls to flush_dcache_range in arch_*_memory")
    Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
    Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Link: https://lore.kernel.org/r/20191204052909.59145-1-aneesh.kumar@linux.ibm.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>