From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To: Marcel Holtmann <marcel@holtmann.org>
Cc: Colin King <colin.king@canonical.com>,
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 08:53:54 -0700 [thread overview]
Message-ID: <CABBYNZ+rXe9OoEHPjmfh0NUkV+upJc7hS23dE40V12hd6FSwyg@mail.gmail.com> (raw)
In-Reply-To: <888C3A95-5410-4B53-8805-4BAE9A9E6010@holtmann.org>
Hi Marcel,
On Thu, Oct 7, 2021 at 8:47 AM Marcel Holtmann <marcel@holtmann.org> wrote:
>
> Hi Luiz,
>
> >> 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.
>
> so should I take the patch "Fix wake up suspend_wait_q prematurely” completely out?
Yes, please take it out.
--
Luiz Augusto von Dentz
prev parent reply other threads:[~2021-10-07 15:54 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
2021-10-07 15:39 ` Colin Ian King
2021-10-07 15:47 ` Marcel Holtmann
2021-10-07 15:53 ` Luiz Augusto von Dentz [this message]
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