add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mmc/core/sdio_bus.c
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@@ -295,6 +295,12 @@
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 	if (!(func->card->quirks & MMC_QUIRK_NONSTD_SDIO))
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 		sdio_free_func_cis(func);
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+	/*
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+	 * We have now removed the link to the tuples in the
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+	 * card structure, so remove the reference.
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+	 */
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+	put_device(&func->card->dev);
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+
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 	kfree(func->info);
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 	kfree(func->tmpbuf);
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 	kfree(func);
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@@ -324,6 +330,12 @@
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 	func->card = card;
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 	device_initialize(&func->dev);
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+
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+	/*
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+	 * We may link to tuples in the card structure,
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+	 * we need make sure we have a reference to it.
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+	 */
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+	get_device(&func->card->dev);
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 	func->dev.parent = &card->dev;
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 	func->dev.bus = &sdio_bus_type;
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@@ -378,10 +390,9 @@
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  */
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 void sdio_remove_func(struct sdio_func *func)
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 {
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-	if (!sdio_func_present(func))
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-		return;
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+	if (sdio_func_present(func))
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+		device_del(&func->dev);
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-	device_del(&func->dev);
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 	of_node_put(func->dev.of_node);
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 	put_device(&func->dev);
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 }