linux-kernel - [PATCH] mwifiex: Make resume actually do something useful again on SDIO cards

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Date:   Wed,  3 Apr 2019 21:01:06 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     linux-rockchip@...ts.infradead.org, briannorris@...omium.org,
        mka@...omium.org, ryandcase@...omium.org, heiko@...ech.de,
        Douglas Anderson <dianders@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Ganapathi Bhat <gbhat@...vell.com>,
        linux-wireless@...r.kernel.org,
        Amitkumar Karwar <amitkarwar@...il.com>,
        linux-kernel@...r.kernel.org,
        Nishant Sarmukadam <nishants@...vell.com>,
        netdev@...r.kernel.org, Xinming Hu <huxinming820@...il.com>
Subject: [PATCH] mwifiex: Make resume actually do something useful again on SDIO cards

The commit fc3a2fcaa1ba ("mwifiex: use atomic bitops to represent
adapter status variables") had a fairly straightforward bug in it.  It
contained this bit of diff:

 - if (!adapter->is_suspended) {
 + if (test_bit(MWIFIEX_IS_SUSPENDED, &adapter->work_flags)) {

As you can see the patch missed the "!" when converting to the atomic
bitops.  This meant that the resume hasn't done anything at all since
that commit landed and suspend/resume for mwifiex SDIO cards has been
totally broken.

After fixing this mwifiex suspend/resume appears to work again, at
least with the simple testing I've done.

Fixes: fc3a2fcaa1ba ("mwifiex: use atomic bitops to represent adapter status variables")
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

 drivers/net/wireless/marvell/mwifiex/sdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c
index a85648342d15..d5a70340a945 100644
--- a/drivers/net/wireless/marvell/mwifiex/sdio.c
+++ b/drivers/net/wireless/marvell/mwifiex/sdio.c
@@ -181,7 +181,7 @@ static int mwifiex_sdio_resume(struct device *dev)
 
 	adapter = card->adapter;
 
-	if (test_bit(MWIFIEX_IS_SUSPENDED, &adapter->work_flags)) {
+	if (!test_bit(MWIFIEX_IS_SUSPENDED, &adapter->work_flags)) {
 		mwifiex_dbg(adapter, WARN,
 			    "device already resumed\n");
 		return 0;
-- 
2.21.0.392.gf8f6787159e-goog