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[76.176.3.80]) by smtp.gmail.com with ESMTPSA id c9sm34969206pfc.92.2019.02.03.23.29.02 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 03 Feb 2019 23:29:03 -0800 (PST) Date: Sun, 3 Feb 2019 23:29:00 -0800 From: Myungho Jung To: Johan Hovold Cc: Marcel Holtmann , Johan Hedberg , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] Bluetooth: Add NULL check for tiocmget() and tiocmset() Message-ID: <20190204072859.nrglf7pfj42itzh5@myunghoj-Precision-5530> References: <20190130053925.GA26699@myunghoj-Precision-5530> <20190131154000.GU3691@localhost> <20190203063823.GA8228@myunghoj-Precision-5530> <20190203105323.GA4686@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190203105323.GA4686@localhost> User-Agent: NeoMutt/20171215 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Feb 03, 2019 at 11:53:23AM +0100, Johan Hovold wrote: > On Sat, Feb 02, 2019 at 10:38:24PM -0800, Myungho Jung wrote: > > On Thu, Jan 31, 2019 at 04:40:00PM +0100, Johan Hovold wrote: > > > On Tue, Jan 29, 2019 at 09:39:28PM -0800, Myungho Jung wrote: > > > > tiocmget() and tiocmset() operations are optional and some tty drivers > > > > like pty miss the operations. We need NULL check to prevent from > > > > dereference. > > > > > > > > Signed-off-by: Myungho Jung > > > > --- > > > > drivers/bluetooth/hci_ath.c | 6 ++++++ > > > > drivers/bluetooth/hci_ldisc.c | 4 ++++ > > > > 2 files changed, 10 insertions(+) > > > > > > Ah, you had already submitted a v2. > > > > > > I still suggest splitting this one in two patches and that you add a > > > Fixes and stable tag to each so that they both get backported to stable. > > > > > > Also, when resubmitting, make sure to include a short changelog here > > > below the cut-off line (---). > > > > > > > > > > > diff --git a/drivers/bluetooth/hci_ath.c b/drivers/bluetooth/hci_ath.c > > > > index d568fbd94d6c..fb9f6323a911 100644 > > > > --- a/drivers/bluetooth/hci_ath.c > > > > +++ b/drivers/bluetooth/hci_ath.c > > > > @@ -185,8 +185,14 @@ static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr) > > > > > > > > static int ath_setup(struct hci_uart *hu) > > > > { > > > > + struct tty_struct *tty = hu->tty; > > > > + > > > > BT_DBG("hu %p", hu); > > > > > > > > + /* tty driver should support operations to set RTS */ > > > > + if (!tty->driver->ops->tiocmget || !tty->driver->ops->tiocmset) > > > > + return -EOPNOTSUPP; > > > > > > -ENODEV might be more appropriate. > > > > > > Johan > > > > I'll split into 2 seperate patches. So, do I need to add stable tag on each > > patch like below to be cherry-picked? > > > > Cc: # : > > > > I looked for a good example from mailing list but didn't find one. > > Almost right, the format you use above is actually used to identify > dependencies for backports. > > You should add a Fixes tag identifying the commit which introduced each > bug and a stable-cc tag. If you want you can indicate the version after > a # sign, but that can also be inferred from the fixes tag. > > For the hci_ldisc fix I think the tags would be: > > Fixes: 2a973dfada2b ("Bluetooth: hci_uart: Add new line discipline enhancements") > Cc: stable # 4.2 > > You can use git blame to track down the offending commits. > > This should all be explained here: > > https://www.kernel.org/doc/html/latest/process/submitting-patches.html > > Johan Thank you for the explanation. I'll carefully read the page and submit the next patch. Thanks, Myungho