From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexey Neyman Subject: [PATCH] mmc: sdhci: Avoid needless loop while handling SDIO interrupts in sdhci_irq() Date: Tue, 5 Nov 2013 19:40:36 -0800 Message-ID: <1383709236-26692-1-git-send-email-stilor@att.net> References: Return-path: Received: from asmtp.lnxw.com ([207.21.185.2]:48643 "EHLO asmtp.lnxw.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752916Ab3KFDjK (ORCPT ); Tue, 5 Nov 2013 22:39:10 -0500 In-Reply-To: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Dong Aisheng , Chris Ball , "open list:SECURE DIGITAL HO..." , open list Cc: Alexey Neyman 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 --- 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 7a7fb4f..a83cd1b 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2491,6 +2491,14 @@ 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: -- 1.8.4.1