From: David Herrmann <dh.herrmann-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Chen Gang <gang.chen-bOixZGp5f+dBDgjK7y7TUQ@public.gmane.org>
Cc: Marcel Holtmann <marcel-kz+m5ild9QBg9hUCZPvPmw@public.gmane.org>,
Gustavo Padovan <gustavo-THi1TnShQwVAfugRpC6u6w@public.gmane.org>,
Johan Hedberg
<johan.hedberg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
Jiri Kosina <jkosina-AlSwsSmVLrQ@public.gmane.org>,
andrei.emeltchenko-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
"linux-bluetooth-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-bluetooth-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
netdev <netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [Suggestion] Bluetooth: hidp: redundant initialization or issue for function hidp_copy_session
Date: Tue, 7 May 2013 21:37:11 +0200 [thread overview]
Message-ID: <CANq1E4Q8g6Uy5DMiEf3aEBmfWN=KnVCfqxErYr=ZWD94D4vmAQ@mail.gmail.com> (raw)
In-Reply-To: <51890AC9.7010501-bOixZGp5f+dBDgjK7y7TUQ@public.gmane.org>
Hi
On Tue, May 7, 2013 at 4:08 PM, Chen Gang <gang.chen-bOixZGp5f+dBDgjK7y7TUQ@public.gmane.org> 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 }
>
next prev parent reply other threads:[~2013-05-07 19:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-07 13:50 [PATCH] Bluetooth: hidp: using strlcpy or strcpy instead of strncpy Chen Gang
2013-05-07 14:08 ` [Suggestion] Bluetooth: hidp: redundant initialization or issue for function hidp_copy_session Chen Gang
[not found] ` <51890AC9.7010501-bOixZGp5f+dBDgjK7y7TUQ@public.gmane.org>
2013-05-07 19:37 ` David Herrmann [this message]
[not found] ` <CANq1E4Q8g6Uy5DMiEf3aEBmfWN=KnVCfqxErYr=ZWD94D4vmAQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-05-08 1:50 ` Chen Gang
2013-05-07 19:31 ` [PATCH] Bluetooth: hidp: using strlcpy or strcpy instead of strncpy David Herrmann
[not found] ` <CANq1E4SmY+CD0uf53_b6GeFkQ-LYnpdxsDGSRMWdn2i1mnb6WQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-05-08 1:02 ` Chen Gang
[not found] ` <5189A417.503-bOixZGp5f+dBDgjK7y7TUQ@public.gmane.org>
2013-05-08 3:34 ` [PATCH v2] Bluetooth: hidp: using strlcpy instead of strncpy, also beautify code Chen Gang
[not found] ` <5189C7C6.8090408-bOixZGp5f+dBDgjK7y7TUQ@public.gmane.org>
2013-05-08 15:16 ` David Herrmann
2013-05-09 1:07 ` Chen Gang
2013-05-09 8:42 ` Jiri Kosina
[not found] ` <alpine.LNX.2.00.1305091041140.23038-ztGlSCb7Y1iN3ZZ/Hiejyg@public.gmane.org>
2013-05-09 8:48 ` Chen Gang
2013-05-13 2:07 ` [PATCH v3] " Chen Gang
2013-05-17 7:04 ` Chen Gang
[not found] ` <51904ACF.6010904-bOixZGp5f+dBDgjK7y7TUQ@public.gmane.org>
2013-05-20 21:52 ` Gustavo Padovan
2013-05-21 1:40 ` Chen Gang
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