From: Ulf Hansson ulf.hansson@linaro.org
[ Upstream commit bd880b00697befb73eff7220ee20bdae4fdd487b ]
To avoid each host driver supporting SDIO IRQs, from keeping track internally about if SDIO IRQs has been claimed, let's introduce a common helper function, sdio_irq_claimed().
The function returns true if SDIO IRQs are claimed, 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.
Tested-by: Matthias Kaehlcke mka@chromium.org Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Reviewed-by: Douglas Anderson dianders@chromium.org Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.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 2ff52de1c2b89..840462ed1ec7e 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -488,6 +488,15 @@ 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 claimed. + */ +static inline bool sdio_irq_claimed(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);