Re: [Suggestion] Bluetooth: hidp: redundant initialization or issue for function hidp_copy_session

Hi

On Tue, May 7, 2013 at 4:08 PM, Chen Gang [off-list ref] wrote:

Hello Maintainers:

In net/bluetooth/hidp/core.c, for hidp_copy_session(), the
'session->input' and 'session->hid' are conflict with each other.

And excuse me, I do not quit know the details, but I think we have 2
choices for fixing it:

  one is ''if (session->input) { } else if (session->hid) { };''
  the other is ''if (seesion->hid) { } else if (session->input) { };''

The first choice assumes the original code has a logical issue; the
second choice assumes the original code has redundant initialization.

The code is fine. Only one of "->input" or "->hid" can be valid at a
time. And exactly one of them is guaranteed to be valid. See
hidp_session_dev_init().

I fixed all code that I changed during the rework to say:

if (session->hid)
...
else if (session->input)
...

It makes the code more clear. But I avoided touching all the other
places that I didn't change, as the code is technically right. Anyway,
I don't care whether we want to fix all other occurrences to use "else
if". Feel free to send a patch.

Thanks
David

Please help check.

Thanks.

  71 static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
  72 {
  73         memset(ci, 0, sizeof(*ci));
  74         bacpy(&ci->bdaddr, &session->bdaddr);
  75
  76         ci->flags = session->flags;
  77         ci->state = BT_CONNECTED;
  78
  79         ci->vendor  = 0x0000;
  80         ci->product = 0x0000;
  81         ci->version = 0x0000;
  82
  83         if (session->input) {
  84                 ci->vendor  = session->input->id.vendor;
  85                 ci->product = session->input->id.product;
  86                 ci->version = session->input->id.version;
  87                 if (session->input->name)
  88                         strncpy(ci->name, session->input->name, 128);
  89                 else
  90                         strncpy(ci->name, "HID Boot Device", 128);
  91         }
  92
  93         if (session->hid) {
  94                 ci->vendor  = session->hid->vendor;
  95                 ci->product = session->hid->product;
  96                 ci->version = session->hid->version;
  97                 strncpy(ci->name, session->hid->name, 128);
  98         }
  99 }