linux-kernel - [PATCH 01/11] mmc: core: Add helper function to indicate if SDIO IRQs is enabled

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Date:   Tue,  3 Sep 2019 16:21:57 +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 01/11] mmc: core: Add helper function to indicate if SDIO IRQs is enabled

To avoid each host driver supporting SDIO IRQs, from keeping track
internally about if SDIO IRQs has been enabled, let's introduce a common
helper function, sdio_irq_enabled().

The function returns true if SDIO IRQs are enabled, via using the
information about the number of claimed irqs. This is safe, even without
any locks, as long as the helper function is called only from
runtime/system suspend callbacks of the host driver.

Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---
 include/linux/mmc/host.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 4a351cb7f20f..0c0a565c7ff1 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -493,6 +493,15 @@ void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq);
 
 void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq);
 
+/*
+ * May be called from host driver's system/runtime suspend/resume callbacks,
+ * to know if SDIO IRQs has been enabled.
+*/
+static inline bool sdio_irq_enabled(struct mmc_host *host)
+{
+	return host->sdio_irqs > 0;
+}
+
 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
 {
 	host->ops->enable_sdio_irq(host, 0);
-- 
2.17.1