linux-kernel - Re: [PATCH] RFC: Bluetooth: missed cpu_to_le16 conversion in hci_init4

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Message-ID: <20191017124300.fktzd27yy2t7gcqx@netronome.com>
Date:   Thu, 17 Oct 2019 14:43:01 +0200
From:   Simon Horman <simon.horman@...ronome.com>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     "Ben Dooks (Codethink)" <ben.dooks@...ethink.co.uk>,
        linux-kernel@...ts.codethink.co.uk,
        Johan Hedberg <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RFC: Bluetooth: missed cpu_to_le16 conversion in
 hci_init4_req

On Wed, Oct 16, 2019 at 08:42:48PM +0200, Marcel Holtmann wrote:
> Hi Simon,
> 
> >> It looks like in hci_init4_req() the request is being
> >> initialised from cpu-endian data but the packet is specified
> >> to be little-endian. This causes an warning from sparse due
> >> to __le16 to u16 conversion.
> >> 
> >> Fix this by using cpu_to_le16() on the two fields in the packet.
> >> 
> >> net/bluetooth/hci_core.c:845:27: warning: incorrect type in assignment (different base types)
> >> net/bluetooth/hci_core.c:845:27:    expected restricted __le16 [usertype] tx_len
> >> net/bluetooth/hci_core.c:845:27:    got unsigned short [usertype] le_max_tx_len
> >> net/bluetooth/hci_core.c:846:28: warning: incorrect type in assignment (different base types)
> >> net/bluetooth/hci_core.c:846:28:    expected restricted __le16 [usertype] tx_time
> >> net/bluetooth/hci_core.c:846:28:    got unsigned short [usertype] le_max_tx_time
> >> 
> >> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
> >> ---
> >> Cc: Marcel Holtmann <marcel@...tmann.org>
> >> Cc: Johan Hedberg <johan.hedberg@...il.com>
> >> Cc: "David S. Miller" <davem@...emloft.net>
> >> Cc: linux-bluetooth@...r.kernel.org
> >> Cc: netdev@...r.kernel.org
> >> Cc: linux-kernel@...r.kernel.org
> >> ---
> >> net/bluetooth/hci_core.c | 4 ++--
> >> 1 file changed, 2 insertions(+), 2 deletions(-)
> >> 
> >> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> >> index 04bc79359a17..b2559d4bed81 100644
> >> --- a/net/bluetooth/hci_core.c
> >> +++ b/net/bluetooth/hci_core.c
> >> @@ -842,8 +842,8 @@ static int hci_init4_req(struct hci_request *req, unsigned long opt)
> >> 	if (hdev->le_features[0] & HCI_LE_DATA_LEN_EXT) {
> >> 		struct hci_cp_le_write_def_data_len cp;
> >> 
> >> -		cp.tx_len = hdev->le_max_tx_len;
> >> -		cp.tx_time = hdev->le_max_tx_time;
> >> +		cp.tx_len = cpu_to_le16(hdev->le_max_tx_len);
> >> +		cp.tx_time = cpu_to_le16(hdev->le_max_tx_time);
> > 
> > I would suggest that the naming of the le_ fields of struct hci_dev
> > implies that the values stored in those fields should be little endian
> > (but those that are more than bone byte wide are not).
> 
> the le_ stands for Low Energy and not for Little Endian.

Thanks, in that case I have no objections.