xtensa: enable coprocessors that are being flushed

coprocessor_flush_all may be called from a context of a thread that is
different from the thread being flushed. In that case contents of the
cpenable special register may not match ti->cpenable of the target
thread, resulting in unhandled coprocessor exception in the kernel
context.
Set cpenable special register to the ti->cpenable of the target register
for the duration of the flush and restore it afterwards.
This fixes the following crash caused by coprocessor register inspection
in native gdb:

  (gdb) p/x $w0
  Illegal instruction in kernel: sig: 9 [#1] PREEMPT
  Call Trace:
    ___might_sleep+0x184/0x1a4
    __might_sleep+0x41/0xac
    exit_signals+0x14/0x218
    do_exit+0xc9/0x8b8
    die+0x99/0xa0
    do_illegal_instruction+0x18/0x6c
    common_exception+0x77/0x77
    coprocessor_flush+0x16/0x3c
    arch_ptrace+0x46c/0x674
    sys_ptrace+0x2ce/0x3b4
    system_call+0x54/0x80
    common_exception+0x77/0x77
  note: gdb[100] exited with preempt_count 1
  Killed

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/arch/xtensa/kernel/process.c b/arch/xtensa/kernel/process.c
index 483dcfb6e681d7d483ef8ebfb948d91b7ee8f1fd..4bb68133a72af93ad00e82d08abb7d26a783b86d 100644 (file)
--- a/arch/xtensa/kernel/process.c
+++ b/arch/xtensa/kernel/process.c
@@ -94,18 +94,21 @@ void coprocessor_release_all(struct thread_info *ti)
 
 void coprocessor_flush_all(struct thread_info *ti)
 {
-       unsigned long cpenable;
+       unsigned long cpenable, old_cpenable;
        int i;
 
        preempt_disable();
 
+       RSR_CPENABLE(old_cpenable);
        cpenable = ti->cpenable;
+       WSR_CPENABLE(cpenable);
 
        for (i = 0; i < XCHAL_CP_MAX; i++) {
                if ((cpenable & 1) != 0 && coprocessor_owner[i] == ti)
                        coprocessor_flush(ti, i);
                cpenable >>= 1;
        }
+       WSR_CPENABLE(old_cpenable);
 
        preempt_enable();
 }