waiting_for_stop_reply around remote_fileio_request

waiting_for_stop_reply around remote_fileio_request

Hi,
I see this error when GDB connects with qemu,

(gdb) n
....
Sending packet: $vCont;c#a8...Ack
Packet received: Ffstat,00000001,f6fff038
Cannot execute this command while the target is running.
Use the "interrupt" command to stop the target
and then try again.

looks we don't set rs->waiting_for_stop_reply to zero
before handle fileio request,

 #10 0x00000000005edb64 in target_write (len=64, offset=4143968312, buf=0x7fffffffd570 "\375\377\377\377", annex=0x0, object=TARGET_OBJECT_MEMORY,
    ops=<optimised out>) at /home/yao/SourceCode/gnu/gdb/git/gdb/target.c:1922
 #11 target_write_memory (memaddr=memaddr@entry=4143968312, myaddr=myaddr@entry=0x7fffffffd6a0 "", len=len@entry=64)
    at /home/yao/SourceCode/gnu/gdb/git/gdb/target.c:1500
 #12 0x00000000004b2b41 in remote_fileio_func_fstat (buf=0x127b258 "") at /home/yao/SourceCode/gnu/gdb/git/gdb/remote-fileio.c:1037
 #13 0x00000000004b1878 in do_remote_fileio_request (uiout=<optimised out>, buf_arg=buf_arg@entry=0x127b240)
    at /home/yao/SourceCode/gnu/gdb/git/gdb/remote-fileio.c:1204
 #14 0x00000000005b8c7c in catch_exceptions_with_msg (func_uiout=<optimised out>, func=func@entry=0x4b1800 <do_remote_fileio_request>,
    func_args=func_args@entry=0x127b240, gdberrmsg=gdberrmsg@entry=0x0, mask=mask@entry=RETURN_MASK_ALL)
    at /home/yao/SourceCode/gnu/gdb/git/gdb/exceptions.c:187
 #15 0x00000000005b8dea in catch_exceptions (uiout=<optimised out>, func=func@entry=0x4b1800 <do_remote_fileio_request>, func_args=func_args@entry=0x127b240,
    mask=mask@entry=RETURN_MASK_ALL) at /home/yao/SourceCode/gnu/gdb/git/gdb/exceptions.c:167
 #16 0x00000000004b2fff in remote_fileio_request (buf=0x127b240 "Xf6fff038,0:", ctrlc_pending_p=0) at /home/yao/SourceCode/gnu/gdb/git/gdb/remote-fileio.c:1255
 #17 0x0000000000496f12 in remote_wait_as (ptid=..., status=0x7fffffffdb20, options=1) at /home/yao/SourceCode/gnu/gdb/git/gdb/remote.c:6997

however, we did set rs->waiting_for_stop_reply to zero before Luis's
patch https://sourceware.org/ml/gdb-patches/2015-10/msg00336.html

In fact, Luis's patch v1
https://sourceware.org/ml/gdb-patches/2015-08/msg00809.html is about
setting rs->waiting_for_stop_reply back to one after
remote_fileio_request, which is correct.  However during the review, the
patch is changed and ends up with "not setting rs->waiting_for_stop_reply
to zero".

I manually test GDB, but I don't have a way to run regression tests.

gdb:

2016-02-04  Yao Qi  <yao.qi@linaro.org>

	* remote.c (remote_wait_as): Set rs->waiting_for_stop_reply to
	0 before handling 'F' and set it back afterwards.