add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/hid/intel-ish-hid/ishtp/dma-if.c
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@@ -1,17 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * ISHTP DMA I/F functions
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  *
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  * Copyright (c) 2003-2016, Intel Corporation.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms and conditions of the GNU General Public License,
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- * version 2, as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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- * more details.
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- *
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  */
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 #include <linux/slab.h>
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@@ -113,6 +104,11 @@
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 	int required_slots = (size / DMA_SLOT_SIZE)
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 		+ 1 * (size % DMA_SLOT_SIZE != 0);
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+	if (!dev->ishtp_dma_tx_map) {
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+		dev_err(dev->devc, "Fail to allocate Tx map\n");
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+		return NULL;
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+	}
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+
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 	spin_lock_irqsave(&dev->ishtp_dma_tx_lock, flags);
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 	for (i = 0; i <= (dev->ishtp_dma_num_slots - required_slots); i++) {
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 		free = 1;
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@@ -159,6 +155,11 @@
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 		return;
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 	}
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+	if (!dev->ishtp_dma_tx_map) {
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+		dev_err(dev->devc, "Fail to allocate Tx map\n");
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+		return;
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+	}
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+
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 	i = (msg_addr - dev->ishtp_host_dma_tx_buf) / DMA_SLOT_SIZE;
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 	spin_lock_irqsave(&dev->ishtp_dma_tx_lock, flags);
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 	for (j = 0; j < acked_slots; j++) {