linux-kernel - [PATCH v2 07/11] mmc: core: WARN if SDIO IRQs are enabled for non-powered card in suspend

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Date:   Sun,  8 Sep 2019 12:12:32 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Douglas Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Cc:     Shawn Lin <shawn.lin@...k-chips.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Yong Mao <yong.mao@...iatek.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 07/11] mmc: core: WARN if SDIO IRQs are enabled for non-powered card in suspend

To make sure SDIO func drivers behaves correctly during system
suspend/resume, let add a WARN_ON in case the condition is a non-powered
SDIO card and there are some SDIO IRQs still being claimed.

Tested-by: Matthias Kaehlcke <mka@...omium.org>
Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---
 drivers/mmc/core/sdio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 8dd8fc32ecca..c557f1519b77 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -951,6 +951,8 @@ static int mmc_sdio_pre_suspend(struct mmc_host *host)
  */
 static int mmc_sdio_suspend(struct mmc_host *host)
 {
+	WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
+
 	/* Prevent processing of SDIO IRQs in suspended state. */
 	mmc_card_set_suspended(host->card);
 	cancel_delayed_work_sync(&host->sdio_irq_work);
-- 
2.17.1