add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mmc/core/sdio_irq.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * linux/drivers/mmc/core/sdio_irq.c
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  *
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@@ -6,11 +7,6 @@
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  * Copyright:   MontaVista Software Inc.
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  *
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  * Copyright 2008 Pierre Ossman
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or (at
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- * your option) any later version.
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  */
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 #include <linux/kernel.h>
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@@ -30,6 +26,34 @@
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 #include "sdio_ops.h"
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 #include "core.h"
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 #include "card.h"
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+
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+static int sdio_get_pending_irqs(struct mmc_host *host, u8 *pending)
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+{
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+	struct mmc_card *card = host->card;
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+	int ret;
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+
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+	WARN_ON(!host->claimed);
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+
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+	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, pending);
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+	if (ret) {
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+		pr_debug("%s: error %d reading SDIO_CCCR_INTx\n",
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+		       mmc_card_id(card), ret);
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+		return ret;
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+	}
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+
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+	if (*pending && mmc_card_broken_irq_polling(card) &&
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+	    !(host->caps & MMC_CAP_SDIO_IRQ)) {
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+		unsigned char dummy;
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+
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+		/* A fake interrupt could be created when we poll SDIO_CCCR_INTx
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+		 * register with a Marvell SD8797 card. A dummy CMD52 read to
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+		 * function 0 register 0xff can avoid this.
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+		 */
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+		mmc_io_rw_direct(card, 0, 0, 0xff, 0, &dummy);
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+	}
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+
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+	return 0;
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+}
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 static int process_sdio_pending_irqs(struct mmc_host *host)
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 {
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@@ -57,23 +81,9 @@
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 		return 1;
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 	}
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-	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending);
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-	if (ret) {
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-		pr_debug("%s: error %d reading SDIO_CCCR_INTx\n",
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-		       mmc_card_id(card), ret);
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+	ret = sdio_get_pending_irqs(host, &pending);
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+	if (ret)
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 		return ret;
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-	}
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-
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-	if (pending && mmc_card_broken_irq_polling(card) &&
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-	    !(host->caps & MMC_CAP_SDIO_IRQ)) {
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-		unsigned char dummy;
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-
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-		/* A fake interrupt could be created when we poll SDIO_CCCR_INTx
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-		 * register with a Marvell SD8797 card. A dummy CMD52 read to
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-		 * function 0 register 0xff can avoid this.
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-		 */
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-		mmc_io_rw_direct(card, 0, 0, 0xff, 0, &dummy);
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-	}
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 	count = 0;
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 	for (i = 1; i <= 7; i++) {
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@@ -100,17 +110,16 @@
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 	return ret;
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 }
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-void sdio_run_irqs(struct mmc_host *host)
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+static void sdio_run_irqs(struct mmc_host *host)
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 {
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 	mmc_claim_host(host);
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 	if (host->sdio_irqs) {
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 		process_sdio_pending_irqs(host);
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-		if (host->ops->ack_sdio_irq)
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+		if (!host->sdio_irq_pending)
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 			host->ops->ack_sdio_irq(host);
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 	}
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 	mmc_release_host(host);
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 }
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-EXPORT_SYMBOL_GPL(sdio_run_irqs);
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 void sdio_irq_work(struct work_struct *work)
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 {
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@@ -130,11 +139,10 @@
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 static int sdio_irq_thread(void *_host)
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 {
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 	struct mmc_host *host = _host;
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-	struct sched_param param = { .sched_priority = 1 };
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 	unsigned long period, idle_period;
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 	int ret;
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-	sched_setscheduler(current, SCHED_FIFO, &param);
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+	sched_set_fifo_low(current);
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 	/*
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 	 * We want to allow for SDIO cards to work even on non SDIO
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@@ -267,14 +275,15 @@
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 	card->sdio_single_irq = NULL;
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 	if ((card->host->caps & MMC_CAP_SDIO_IRQ) &&
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-	    card->host->sdio_irqs == 1)
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+	    card->host->sdio_irqs == 1) {
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 		for (i = 0; i < card->sdio_funcs; i++) {
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-		       func = card->sdio_func[i];
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-		       if (func && func->irq_handler) {
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-			       card->sdio_single_irq = func;
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-			       break;
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-		       }
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-	       }
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+			func = card->sdio_func[i];
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+			if (func && func->irq_handler) {
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+				card->sdio_single_irq = func;
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+				break;
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+			}
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+		}
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+	}
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 }
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 /**