linux-kernel - [PATCH v2 2/2] mwifiex: Make use of the new sdio_trigger

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Message-Id: <20190722193939.125578-3-dianders@chromium.org>
Date:   Mon, 22 Jul 2019 12:39:39 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ganapathi Bhat <gbhat@...vell.com>, linux-wireless@...r.kernel.org,
        Andreas Fenkart <afenkart@...il.com>,
        Brian Norris <briannorris@...omium.org>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        linux-rockchip@...ts.infradead.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Nishant Sarmukadam <nishants@...vell.com>,
        netdev@...r.kernel.org, Avri Altman <avri.altman@....com>,
        linux-mmc@...r.kernel.org, davem@...emloft.net,
        Xinming Hu <huxinming820@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] mwifiex: Make use of the new sdio_trigger_replug() API to reset

As described in the patch ("mmc: core: Add sdio_trigger_replug()
API"), the current mwifiex_sdio_card_reset() is broken in the cases
where we're running Bluetooth on a second SDIO func on the same card
as WiFi.  The problem goes away if we just use the
sdio_trigger_replug() API call.

NOTE: Even though with this new solution there is less of a reason to
do our work from a workqueue (the unplug / plug mechanism we're using
is possible for a human to perform at any time so the stack is
supposed to handle it without it needing to be called from a special
context), we still need a workqueue because the Marvell reset function
could called from a context where sleeping is invalid and thus we
can't claim the host.  One example is Marvell's wakeup_timer_fn().

Cc: Andreas Fenkart <afenkart@...il.com>
Cc: Brian Norris <briannorris@...omium.org>
Fixes: b4336a282db8 ("mwifiex: sdio: reset adapter using mmc_hw_reset")
Signed-off-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Brian Norris <briannorris@...omium.org>
---

Changes in v2:
- Removed clear_bit() calls and old comment (Brian Norris).
- Explicit CC of Andreas Fenkart.
- Explicit CC of Brian Norris.
- Add "Fixes" pointing at the commit Brian talked about.
- Add Brian's Reviewed-by tag.

 drivers/net/wireless/marvell/mwifiex/sdio.c | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c
index 24c041dad9f6..7ec5068f6ffd 100644
--- a/drivers/net/wireless/marvell/mwifiex/sdio.c
+++ b/drivers/net/wireless/marvell/mwifiex/sdio.c
@@ -2218,24 +2218,10 @@ static void mwifiex_sdio_card_reset_work(struct mwifiex_adapter *adapter)
 {
 	struct sdio_mmc_card *card = adapter->card;
 	struct sdio_func *func = card->func;
-	int ret;
-
-	mwifiex_shutdown_sw(adapter);
 
-	/* power cycle the adapter */
 	sdio_claim_host(func);
-	mmc_hw_reset(func->card->host);
+	sdio_trigger_replug(func);
 	sdio_release_host(func);
-
-	/* Previous save_adapter won't be valid after this. We will cancel
-	 * pending work requests.
-	 */
-	clear_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP, &card->work_flags);
-	clear_bit(MWIFIEX_IFACE_WORK_CARD_RESET, &card->work_flags);
-
-	ret = mwifiex_reinit_sw(adapter);
-	if (ret)
-		dev_err(&func->dev, "reinit failed: %d\n", ret);
 }
 
 /* This function read/write firmware */
-- 
2.22.0.657.g960e92d24f-goog