From 0a8fd09ca9d4564a1f906b530ea08415a61cff58 Mon Sep 17 00:00:00 2001 From: Alexey Neyman Date: Tue, 5 Nov 2013 19:40:36 -0800 Subject: [PATCH] mmc: sdhci: Avoid needless loop while handling SDIO interrupts in sdhci_irq Ignore Card Interrupt bit in the interrupt status if we already know that mmc_signal_sdio_irq() is going to be called at the end of sdhci_irq(). This avoids a needless loop in sdhci_irq() repeatedly reading interrupt status and doing nothing. Signed-off-by: Alexey Neyman Acked-by: Dong Aisheng Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 6785fb1dc5c6..bd8a0982aec3 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2501,6 +2501,14 @@ again: result = IRQ_HANDLED; intmask = sdhci_readl(host, SDHCI_INT_STATUS); + + /* + * If we know we'll call the driver to signal SDIO IRQ, disregard + * further indications of Card Interrupt in the status to avoid a + * needless loop. + */ + if (cardint) + intmask &= ~SDHCI_INT_CARD_INT; if (intmask && --max_loops) goto again; out: -- 2.34.1