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Subject: Re: [PATCH v2] Bluetooth: Remove spurious error message
From:   Marcel Holtmann <marcel@holtmann.org>
In-Reply-To: <20210513122220.313465-1-szymon.janc@codecoup.pl>
Date:   Thu, 13 May 2021 17:11:48 +0200
Cc:     Bluetooth Kernel Mailing List <linux-bluetooth@vger.kernel.org>,
        stable@vger.kernel.org
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Message-Id: <B7FCFE61-A3A2-4E82-8FBD-8AB1D9277380@holtmann.org>
References: <20210513122220.313465-1-szymon.janc@codecoup.pl>
To:     Szymon Janc <szymon.janc@codecoup.pl>
Precedence: bulk

Hi Szymon,

> Even with rate limited reporting this is very spammy and since
> it is remote device that is providing bogus data there is no
> need to report this as error.
> 
> Since real_len variable was used only to allow conditional error
> message it is now also removed.
> 
> [72454.143336] bt_err_ratelimited: 10 callbacks suppressed
> [72454.143337] Bluetooth: hci0: advertising data len corrected
> [72454.296314] Bluetooth: hci0: advertising data len corrected
> [72454.892329] Bluetooth: hci0: advertising data len corrected
> [72455.051319] Bluetooth: hci0: advertising data len corrected
> [72455.357326] Bluetooth: hci0: advertising data len corrected
> [72455.663295] Bluetooth: hci0: advertising data len corrected
> [72455.787278] Bluetooth: hci0: advertising data len corrected
> [72455.942278] Bluetooth: hci0: advertising data len corrected
> [72456.094276] Bluetooth: hci0: advertising data len corrected
> [72456.249137] Bluetooth: hci0: advertising data len corrected
> [72459.416333] bt_err_ratelimited: 13 callbacks suppressed
> [72459.416334] Bluetooth: hci0: advertising data len corrected
> [72459.721334] Bluetooth: hci0: advertising data len corrected
> [72460.011317] Bluetooth: hci0: advertising data len corrected
> [72460.327171] Bluetooth: hci0: advertising data len corrected
> [72460.638294] Bluetooth: hci0: advertising data len corrected
> [72460.946350] Bluetooth: hci0: advertising data len corrected
> [72461.225320] Bluetooth: hci0: advertising data len corrected
> [72461.690322] Bluetooth: hci0: advertising data len corrected
> [72462.118318] Bluetooth: hci0: advertising data len corrected
> [72462.427319] Bluetooth: hci0: advertising data len corrected
> [72464.546319] bt_err_ratelimited: 7 callbacks suppressed
> [72464.546319] Bluetooth: hci0: advertising data len corrected
> [72464.857318] Bluetooth: hci0: advertising data len corrected
> [72465.163332] Bluetooth: hci0: advertising data len corrected
> [72465.278331] Bluetooth: hci0: advertising data len corrected
> [72465.432323] Bluetooth: hci0: advertising data len corrected
> [72465.891334] Bluetooth: hci0: advertising data len corrected
> [72466.045334] Bluetooth: hci0: advertising data len corrected
> [72466.197321] Bluetooth: hci0: advertising data len corrected
> [72466.340318] Bluetooth: hci0: advertising data len corrected
> [72466.498335] Bluetooth: hci0: advertising data len corrected
> [72469.803299] bt_err_ratelimited: 10 callbacks suppressed
> 
> Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>
> Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=203753
> Cc: stable@vger.kernel.org
> ---
> net/bluetooth/hci_event.c | 10 ++--------
> 1 file changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 5e99968939ce..26846d338fa7 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -5441,7 +5441,7 @@ static void process_adv_report(struct hci_dev *hdev, u8 type, bdaddr_t *bdaddr,
> 	struct hci_conn *conn;
> 	bool match;
> 	u32 flags;
> -	u8 *ptr, real_len;
> +	u8 *ptr;
> 
> 	switch (type) {
> 	case LE_ADV_IND:
> @@ -5472,14 +5472,8 @@ static void process_adv_report(struct hci_dev *hdev, u8 type, bdaddr_t *bdaddr,
> 			break;
> 	}
> 
> -	real_len = ptr - data;
> -
> 	/* Adjust for actual length */
> -	if (len != real_len) {
> -		bt_dev_err_ratelimited(hdev, "advertising data len corrected %u -> %u",
> -				       len, real_len);
> -		len = real_len;
> -	}
> +	len = ptr - data;

please put a comment above the statement that this handles the
case of incorrect advertising data len.

Regards

Marcel