Commit 0a8fd09c authored Nov 05, 2013 by Alexey Neyman Committed by Chris Ball Nov 08, 2013

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 <stilor@att.net>
Acked-by: Dong Aisheng <b29396@freescale.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

parent 4d223782

drivers/mmc/host/sdhci.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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: