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mhi: core: Add NULL check in debugfs show callback

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Upon external soc power down mhi controller context pointer
is set to NULL. If debugfs query is issued at that time it
results into NULL pointer dereference. Fix the issue by adding
a NULL check in debugfs show callback for event and channel.

Change-Id: I8c947bc6c42e80c625bf06c17e73368d2195a2bb
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
This commit is contained in:
Hemant Kumar 2020-01-06 11:11:28 -08:00 committed by Gerrit - the friendly Code Review server
parent 96cd181257
commit 1092885dc8
1 changed files with 7 additions and 1 deletions
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8
drivers/bus/mhi/core/mhi_main.c
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@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2018-2019, The Linux Foundation. All rights reserved. */
/* Copyright (c) 2018-2020, The Linux Foundation. All rights reserved. */
#include <linux/debugfs.h>
#include <linux/device.h>
@ -2038,6 +2038,9 @@ int mhi_debugfs_mhi_event_show(struct seq_file *m, void *d)
int i;
if (!mhi_cntrl->mhi_ctxt)
return -ENODEV;
seq_printf(m, "[%llu ns]:\n", sched_clock());
er_ctxt = mhi_cntrl->mhi_ctxt->er_ctxt;
@ -2071,6 +2074,9 @@ int mhi_debugfs_mhi_chan_show(struct seq_file *m, void *d)
struct mhi_chan_ctxt *chan_ctxt;
int i;
if (!mhi_cntrl->mhi_ctxt)
return -ENODEV;
seq_printf(m, "[%llu ns]:\n", sched_clock());
mhi_chan = mhi_cntrl->mhi_chan;