From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To: Colin King <colin.king@canonical.com>
Cc: Marcel Holtmann <marcel@holtmann.org>,
Johan Hedberg <johan.hedberg@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
"linux-bluetooth@vger.kernel.org"
<linux-bluetooth@vger.kernel.org>,
"open list:NETWORKING [GENERAL]" <netdev@vger.kernel.org>,
kernel-janitors@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH][next] Bluetooth: use bitmap_empty to check if a bitmap has any bits set
Date: Thu, 7 Oct 2021 08:34:54 -0700 [thread overview]
Message-ID: <CABBYNZKzVtyZ_qO8pvenSLFRdm9aumxD_-Src4VG3UHQa8y+1w@mail.gmail.com> (raw)
In-Reply-To: <20211007111713.12207-1-colin.king@canonical.com>
Hi Colin,
On Thu, Oct 7, 2021 at 4:17 AM Colin King <colin.king@canonical.com> wrote:
>
> From: Colin Ian King <colin.king@canonical.com>
>
> The check to see if any tasks are left checks if bitmap array is zero
> rather than using the appropriate bitmap helper functions to check the
> bits in the array. Fix this by using bitmap_empty on the bitmap.
>
> Addresses-Coverity: (" Array compared against 0")
> Fixes: 912730b52552 ("Bluetooth: Fix wake up suspend_wait_q prematurely")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> net/bluetooth/hci_request.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
> index 209f4fe17237..bad3b9c895ba 100644
> --- a/net/bluetooth/hci_request.c
> +++ b/net/bluetooth/hci_request.c
> @@ -1108,7 +1108,7 @@ static void suspend_req_complete(struct hci_dev *hdev, u8 status, u16 opcode)
> clear_bit(SUSPEND_SET_ADV_FILTER, hdev->suspend_tasks);
>
> /* Wake up only if there are no tasks left */
> - if (!hdev->suspend_tasks)
> + if (!bitmap_empty(hdev->suspend_tasks, __SUSPEND_NUM_TASKS))
> wake_up(&hdev->suspend_wait_q);
> }
>
> --
> 2.32.0
I was going to revert this change since it appears wake_up does
actually check the wake condition there is no premature wake up after
all.
--
Luiz Augusto von Dentz
next prev parent reply other threads:[~2021-10-07 15:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-07 11:17 [PATCH][next] Bluetooth: use bitmap_empty to check if a bitmap has any bits set Colin King
2021-10-07 15:34 ` Luiz Augusto von Dentz [this message]
2021-10-07 15:39 ` Colin Ian King
2021-10-07 15:47 ` Marcel Holtmann
2021-10-07 15:53 ` Luiz Augusto von Dentz
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