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Tsirkin" To: Luiz Augusto von Dentz Cc: Igor Skalkin , Jason Wang , virtualization@lists.linux-foundation.org, Linux Kernel Mailing List , Marcel Holtmann , Johan Hedberg , "linux-bluetooth@vger.kernel.org" , mgo@opensynergy.com Subject: Re: [PATCH] virtio_bt: Fix alignment in configuration struct Message-ID: <20220830094441-mutt-send-email-mst@kernel.org> References: <20220807221152.38948-1-Igor.Skalkin@opensynergy.com> <20220807185846-mutt-send-email-mst@kernel.org> <02222fcb-eaba-617a-c51c-f939678e3d74@opensynergy.com> <20220808081054-mutt-send-email-mst@kernel.org> <20220811035817-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 11, 2022 at 10:02:31AM -0700, Luiz Augusto von Dentz wrote: > Hi Michael, > > On Thu, Aug 11, 2022 at 1:00 AM Michael S. Tsirkin wrote: > > > > On Mon, Aug 08, 2022 at 08:16:11AM -0400, Michael S. Tsirkin wrote: > > > On Mon, Aug 08, 2022 at 02:04:43PM +0200, Igor Skalkin wrote: > > > > On 8/8/22 01:00, Michael S. Tsirkin wrote: > > > > > > > > On Mon, Aug 08, 2022 at 12:11:52AM +0200, Igor Skalkin wrote: > > > > > > > > According to specification [1], "For the device-specific configuration > > > > space, the driver MUST use 8 bit wide accesses for 8 bit wide fields, > > > > 16 bit wide and aligned accesses for 16 bit wide fields and 32 bit wide > > > > and aligned accesses for 32 and 64 bit wide fields.". > > > > > > > > Current version of the configuration structure: > > > > > > > > struct virtio_bt_config { > > > > __u8 type; > > > > __u16 vendor; > > > > __u16 msft_opcode; > > > > } __attribute__((packed)); > > > > > > > > has both 16bit fields non-aligned. > > > > > > > > This commit fixes it. > > > > > > > > [1] https://ddec1-0-en-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=https%3a%2f%2fdocs.oasis%2dopen.org%2fvirtio%2fvirtio%2fv1.1%2fvirtio%2dv1.1.pdf&umid=d1786ace-e8ea-40e8-9665-96c0949174e5&auth=53c7c7de28b92dfd96e93d9dd61a23e634d2fbec-39b15885ceebe9fda9357320aec1ccbac416a470 > > > > > > > > Signed-off-by: Igor Skalkin > > > > > > > > This is all true enough, but the problem is > > > > 1. changing uapi like this can't be done, will break userspace > > > > 2. the driver has more issues and no one seems to want to > > > > maintain it. > > > > I posted a patch "Bluetooth: virtio_bt: mark broken" and intend > > > > to merge it for this release. > > > > > > > > This is very sad. We already use this driver in our projects. > > > > > > Really? Can you step up to maintain it? Then we can fix the issues > > > and it won't be broken. > > > > Just a reminder that I'm waiting for a response on that. > > I just don't know enough about bluetooth. > > Just a heads up that Marcel is on vacation, he did mention that he had > done some work to update virtio_bt thus why I didn't apply any of the > changes yet. Any update? when does Marcel return? > > -- > > MST > > > > > -- > Luiz Augusto von Dentz