From: Brian Norris <briannorris@chromium.org>
To: Ganapathi Bhat <gbhat@marvell.com>,
Nishant Sarmukadam <nishants@marvell.com>
Cc: linux-kernel@vger.kernel.org,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Kalle Valo <kvalo@codeaurora.org>,
linux-wireless@vger.kernel.org
Subject: Re: [PATCH v2 1/2] mwifiex: initiate card-specific work atomically
Date: Mon, 1 May 2017 11:47:33 -0700 [thread overview]
Message-ID: <20170501184732.GA53046@google.com> (raw)
In-Reply-To: <20170501184549.52896-1-briannorris@chromium.org>
On Mon, May 01, 2017 at 11:45:48AM -0700, Brian Norris wrote:
> The non-atomic test + set is a little awkward here, and it technically
> means we might double-schedule work unnecessarily. AFAICT, this is not
> really a problem, since the extra "work" will be a no-op (the flag(s)
> will be cleared by then), but it's still an anti-pattern.
>
> Rewrite this to use the atomic test_and_set_bit() helper instead.
>
> Signed-off-by: Brian Norris <briannorris@chromium.org>
> ---
> new in v2
> ---
> drivers/net/wireless/marvell/mwifiex/pcie.c | 13 +++++++++----
> drivers/net/wireless/marvell/mwifiex/sdio.c | 16 +++++-----------
> 2 files changed, 14 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
> index ac62bce50e96..8e7d6f41a952 100644
> --- a/drivers/net/wireless/marvell/mwifiex/pcie.c
> +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
> @@ -2837,12 +2837,17 @@ static void mwifiex_pcie_device_dump(struct mwifiex_adapter *adapter)
> {
> struct pcie_service_card *card = adapter->card;
>
> - if (test_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP, &card->work_flags))
> - return;
> + if (!test_and_set_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP,
> + &card->work_flags))
> + schedule_work(&card->work);
> +}
>
> - set_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP, &card->work_flags);
> +static void mwifiex_pcie_card_reset(struct mwifiex_adapter *adapter)
> +{
> + struct pcie_service_card *card = adapter->card;
>
> - schedule_work(&card->work);
> + if (!test_and_set_bit(MWIFIEX_IFACE_WORK_CARD_RESET, &card->work_flags))
> + schedule_work(&card->work);
> }
>
> static void mwifiex_pcie_free_buffers(struct mwifiex_adapter *adapter)
Ooops, mis-split on patch 1 vs. 2. This won't be bisectable! Sorry,
please ignore! Will send v3 soon.
prev parent reply other threads:[~2017-05-01 18:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-01 18:45 [PATCH v2 1/2] mwifiex: initiate card-specific work atomically Brian Norris
2017-05-01 18:45 ` [PATCH v2 2/2] mwifiex: pcie: add card_reset() support Brian Norris
2017-05-01 18:47 ` Brian Norris [this message]
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