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Date:   Wed, 10 Feb 2021 11:53:22 -0500
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Wen Gong <wgong@codeaurora.org>
Cc:     Brian Norris <briannorris@chromium.org>,
        ath10k <ath10k@lists.infradead.org>,
        linux-wireless <linux-wireless@vger.kernel.org>
Subject: Re: [PATCH] ath10k: change len of trace_ath10k_log_dbg_dump for
 large buffer size
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On Wed, 10 Feb 2021 11:48:23 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:

> On Wed, 10 Feb 2021 11:30:26 -0500
> Steven Rostedt <rostedt@goodmis.org> wrote:
> 
> > Can you test this patch?  
> 
> v2:

Bah!

v3:

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index b79bcacdd6f9..90d7ade03499 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2739,7 +2739,7 @@ trace_event_buffer_lock_reserve(struct trace_buffer **current_rb,
 	    (entry = this_cpu_read(trace_buffered_event))) {
 		/* Try to use the per cpu buffer first */
 		val = this_cpu_inc_return(trace_buffered_event_cnt);
-		if (val == 1) {
+		if ((len < (PAGE_SIZE - sizeof(*entry))) && val == 1) {
 			trace_event_setup(entry, type, trace_ctx);
 			entry->array[0] = len;
 			return entry;