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Commit 7ed6695e authored by Mao Jinlong's avatar Mao Jinlong Committed by Gerrit - the friendly Code Review server
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byte-cntr: Don't write csr register when byte-cntr is disabled 



It is possible that byte-cntr release happens after byte-cntr is disabled.
Don't write csr register when byte-cntr is disabled to avoid the register
access issue.

Change-Id: Ic818107e1bcbe31e1a55cdc8c0f6ff89ff70564f
Signed-off-by: default avatarMao Jinlong <jinlmao@codeaurora.org>
parent 7ca2b21c

drivers/hwtracing/coresight/coresight-byte-cntr.c

+3 −2
Original line number Diff line number Diff line 
/* Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.

/* Copyright (c) 2017-2021, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -222,6 +222,7 @@ static int tmc_etr_byte_cntr_release(struct inode *in, struct file *fp) 
	mutex_lock(&byte_cntr_data->byte_cntr_lock);

	byte_cntr_data->read_active = false;



	if (byte_cntr_data->enable)

		coresight_csr_set_byte_cntr(byte_cntr_data->csr, 0);

	mutex_unlock(&byte_cntr_data->byte_cntr_lock);