From 8fa1337cb972e5486141340da2ea2e066b497877 Mon Sep 17 00:00:00 2001
From: Xiangfu Liu <xiangfu@sharism.cc>
Date: Thu, 17 Nov 2011 15:08:48 +0800
Subject: [PATCH]  this commit break the ks7010 driver.  for more information
 please read  "SDIO single IRQ optimization breaks libertas" linux-mmc mailing
 list

 we should fix this in ks7010 driver. commit this revert first. fix later
---
 ...optimized-SDIO-IRQ-handling-for-sing.patch | 98 +++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 target/linux/xburst/patches-3.0/0034-Revert-mmc-sdio-optimized-SDIO-IRQ-handling-for-sing.patch

diff --git a/target/linux/xburst/patches-3.0/0034-Revert-mmc-sdio-optimized-SDIO-IRQ-handling-for-sing.patch b/target/linux/xburst/patches-3.0/0034-Revert-mmc-sdio-optimized-SDIO-IRQ-handling-for-sing.patch
new file mode 100644
index 000000000..b7a538fc2
--- /dev/null
+++ b/target/linux/xburst/patches-3.0/0034-Revert-mmc-sdio-optimized-SDIO-IRQ-handling-for-sing.patch
@@ -0,0 +1,98 @@
+From 81734e6cd3cd75be1608717e9cd0a6cac54af528 Mon Sep 17 00:00:00 2001
+From: Xiangfu Liu <xiangfu@sharism.cc>
+Date: Thu, 17 Nov 2011 14:41:20 +0800
+Subject: [PATCH] Revert "mmc: sdio: optimized SDIO IRQ handling for single irq"
+
+This reverts commit 06e8935febe687e2a561707d4c7ca4245d261dbe.
+---
+ drivers/mmc/core/sdio_irq.c |   33 +--------------------------------
+ include/linux/mmc/card.h    |    1 -
+ 2 files changed, 1 insertions(+), 33 deletions(-)
+
+diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
+index 03ead02..b300161 100644
+--- a/drivers/mmc/core/sdio_irq.c
++++ b/drivers/mmc/core/sdio_irq.c
+@@ -31,17 +31,6 @@ static int process_sdio_pending_irqs(struct mmc_card *card)
+ {
+ 	int i, ret, count;
+ 	unsigned char pending;
+-	struct sdio_func *func;
+-
+-	/*
+-	 * Optimization, if there is only 1 function interrupt registered
+-	 * call irq handler directly
+-	 */
+-	func = card->sdio_single_irq;
+-	if (func) {
+-		func->irq_handler(func);
+-		return 1;
+-	}
+ 
+ 	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending);
+ 	if (ret) {
+@@ -53,7 +42,7 @@ static int process_sdio_pending_irqs(struct mmc_card *card)
+ 	count = 0;
+ 	for (i = 1; i <= 7; i++) {
+ 		if (pending & (1 << i)) {
+-			func = card->sdio_func[i - 1];
++			struct sdio_func *func = card->sdio_func[i - 1];
+ 			if (!func) {
+ 				printk(KERN_WARNING "%s: pending IRQ for "
+ 					"non-existent function\n",
+@@ -197,24 +186,6 @@ static int sdio_card_irq_put(struct mmc_card *card)
+ 	return 0;
+ }
+ 
+-/* If there is only 1 function registered set sdio_single_irq */
+-static void sdio_single_irq_set(struct mmc_card *card)
+-{
+-	struct sdio_func *func;
+-	int i;
+-
+-	card->sdio_single_irq = NULL;
+-	if ((card->host->caps & MMC_CAP_SDIO_IRQ) &&
+-	    card->host->sdio_irqs == 1)
+-		for (i = 0; i < card->sdio_funcs; i++) {
+-		       func = card->sdio_func[i];
+-		       if (func && func->irq_handler) {
+-			       card->sdio_single_irq = func;
+-			       break;
+-		       }
+-	       }
+-}
+-
+ /**
+  *	sdio_claim_irq - claim the IRQ for a SDIO function
+  *	@func: SDIO function
+@@ -256,7 +227,6 @@ int sdio_claim_irq(struct sdio_func *func, sdio_irq_handler_t *handler)
+ 	ret = sdio_card_irq_get(func->card);
+ 	if (ret)
+ 		func->irq_handler = NULL;
+-	sdio_single_irq_set(func->card);
+ 
+ 	return ret;
+ }
+@@ -281,7 +251,6 @@ int sdio_release_irq(struct sdio_func *func)
+ 	if (func->irq_handler) {
+ 		func->irq_handler = NULL;
+ 		sdio_card_irq_put(func->card);
+-		sdio_single_irq_set(func->card);
+ 	}
+ 
+ 	ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
+diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
+index 6ad4355..5fa4f05 100644
+--- a/include/linux/mmc/card.h
++++ b/include/linux/mmc/card.h
+@@ -208,7 +208,6 @@ struct mmc_card {
+ 	struct sdio_cccr	cccr;		/* common card info */
+ 	struct sdio_cis		cis;		/* common tuple info */
+ 	struct sdio_func	*sdio_func[SDIO_MAX_FUNCS]; /* SDIO functions (devices) */
+-	struct sdio_func	*sdio_single_irq; /* SDIO function when only one IRQ active */
+ 	unsigned		num_info;	/* number of info strings */
+ 	const char		**info;		/* info strings */
+ 	struct sdio_func_tuple	*tuples;	/* unknown common tuples */
+-- 
+1.7.4.1
+