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Subject: Re: [PATCH V1]Perf: Return error code for perf_session__new function
 on failure
To:     Mamatha Inamdar <mamatha4@linux.vnet.ibm.com>,
        linux-kernel@vger.kernel.org
Cc:     peterz@infradead.org, mingo@redhat.com,
        alexander.shishkin@linux.intel.com, jolsa@redhat.com,
        namhyung@kernel.org, kstewart@linuxfoundation.org,
        gregkh@linuxfoundation.org, jeremie.galarneau@efficios.com,
        shawn@git.icu, tstoyanov@vmware.com, tglx@linutronix.de,
        alexey.budankov@linux.intel.com, adrian.hunter@intel.com,
        songliubraving@fb.com, ravi.bangoria@linux.ibm.com
References: <20190820105645.4920.55590.stgit@localhost.localdomain>
From:   Mukesh Ojha <mojha@codeaurora.org>
Message-ID: <a35bc9b3-f9af-1cfc-160c-b5951d5d994b@codeaurora.org>
Date:   Wed, 21 Aug 2019 01:07:27 +0530
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On 8/20/2019 4:51 PM, Mamatha Inamdar wrote:
> This Patch is to return error code of perf_new_session function
> on failure instead of NULL
> ----------------------------------------------
> Test Results:
>
> Before Fix:
>
> $ perf c2c report -input
> failed to open nput: No such file or directory
>
> $ echo $?
> 0
> ------------------------------------------
> After Fix:
>
> $ ./perf c2c report -input
> failed to open nput: No such file or directory
>
> $ echo $?
> 254
>
> Signed-off-by: Mamatha Inamdar <mamatha4@linux.vnet.ibm.com>
> Acked-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
> Reported-by: Nageswara R Sastry <rnsastry@linux.vnet.ibm.com>
> Tested-by: Nageswara R Sastry <rnsastry@linux.vnet.ibm.com>

Looks good to me.

Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>

Thanks,
Mukesh

> ---
>   tools/perf/builtin-annotate.c      |    5 +++--
>   tools/perf/builtin-buildid-cache.c |    5 +++--
>   tools/perf/builtin-buildid-list.c  |    5 +++--
>   tools/perf/builtin-c2c.c           |    6 ++++--
>   tools/perf/builtin-diff.c          |    9 +++++----
>   tools/perf/builtin-evlist.c        |    5 +++--
>   tools/perf/builtin-inject.c        |    5 +++--
>   tools/perf/builtin-kmem.c          |    5 +++--
>   tools/perf/builtin-kvm.c           |    9 +++++----
>   tools/perf/builtin-lock.c          |    5 +++--
>   tools/perf/builtin-mem.c           |    5 +++--
>   tools/perf/builtin-record.c        |    5 +++--
>   tools/perf/builtin-report.c        |    4 ++--
>   tools/perf/builtin-sched.c         |   11 ++++++-----
>   tools/perf/builtin-script.c        |    9 +++++----
>   tools/perf/builtin-stat.c          |   11 ++++++-----
>   tools/perf/builtin-timechart.c     |    5 +++--
>   tools/perf/builtin-top.c           |    5 +++--
>   tools/perf/builtin-trace.c         |    4 ++--
>   tools/perf/util/data-convert-bt.c  |    5 ++++-
>   tools/perf/util/session.c          |   13 +++++++++----
>   21 files changed, 81 insertions(+), 55 deletions(-)
>
> diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
> index 9bb6371..b3b9631 100644
> --- a/tools/perf/builtin-annotate.c
> +++ b/tools/perf/builtin-annotate.c
> @@ -33,6 +33,7 @@
>   #include "util/data.h"
>   #include "arch/common.h"
>   #include "util/block-range.h"
> +#include <linux/err.h>
>   
>   #include <dlfcn.h>
>   #include <errno.h>
> @@ -581,8 +582,8 @@ int cmd_annotate(int argc, const char **argv)
>   	data.path = input_name;
>   
>   	annotate.session = perf_session__new(&data, false, &annotate.tool);
> -	if (annotate.session == NULL)
> -		return -1;
> +	if (IS_ERR(annotate.session))
> +		return PTR_ERR(annotate.session);
>   
>   	annotate.has_br_stack = perf_header__has_feat(&annotate.session->header,
>   						      HEADER_BRANCH_STACK);
> diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
> index 10457b1..7bab695 100644
> --- a/tools/perf/builtin-buildid-cache.c
> +++ b/tools/perf/builtin-buildid-cache.c
> @@ -26,6 +26,7 @@
>   #include "util/symbol.h"
>   #include "util/time-utils.h"
>   #include "util/probe-file.h"
> +#include <linux/err.h>
>   
>   static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid)
>   {
> @@ -420,8 +421,8 @@ int cmd_buildid_cache(int argc, const char **argv)
>   		data.force = force;
>   
>   		session = perf_session__new(&data, false, NULL);
> -		if (session == NULL)
> -			return -1;
> +		if (IS_ERR(session))
> +			return PTR_ERR(session);
>   	}
>   
>   	if (symbol__init(session ? &session->header.env : NULL) < 0)
> diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
> index f403e19..95036ee 100644
> --- a/tools/perf/builtin-buildid-list.c
> +++ b/tools/perf/builtin-buildid-list.c
> @@ -18,6 +18,7 @@
>   #include "util/symbol.h"
>   #include "util/data.h"
>   #include <errno.h>
> +#include <linux/err.h>
>   
>   static int sysfs__fprintf_build_id(FILE *fp)
>   {
> @@ -65,8 +66,8 @@ static int perf_session__list_build_ids(bool force, bool with_hits)
>   		goto out;
>   
>   	session = perf_session__new(&data, false, &build_id__mark_dso_hit_ops);
> -	if (session == NULL)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	/*
>   	 * We take all buildids when the file contains AUX area tracing data
> diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> index f0aae6e..a26a33c 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -34,6 +34,7 @@
>   #include "thread.h"
>   #include "mem2node.h"
>   #include "symbol.h"
> +#include <linux/err.h>
>   
>   struct c2c_hists {
>   	struct hists		hists;
> @@ -2774,8 +2775,9 @@ static int perf_c2c__report(int argc, const char **argv)
>   	}
>   
>   	session = perf_session__new(&data, 0, &c2c.tool);
> -	if (session == NULL) {
> -		pr_debug("No memory for session\n");
> +	if (IS_ERR(session)) {
> +		err = PTR_ERR(session);
> +		pr_debug("Error creating perf session\n");
>   		goto out;
>   	}
>   
> diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
> index e91c0d7..3fb4938 100644
> --- a/tools/perf/builtin-diff.c
> +++ b/tools/perf/builtin-diff.c
> @@ -22,6 +22,7 @@
>   #include "util/annotate.h"
>   #include "util/map.h"
>   #include <linux/zalloc.h>
> +#include <linux/err.h>
>   
>   #include <errno.h>
>   #include <inttypes.h>
> @@ -1149,9 +1150,9 @@ static int check_file_brstack(void)
>   
>   	data__for_each_file(i, d) {
>   		d->session = perf_session__new(&d->data, false, &pdiff.tool);
> -		if (!d->session) {
> +		if (IS_ERR(d->session)) {
>   			pr_err("Failed to open %s\n", d->data.path);
> -			return -1;
> +			return PTR_ERR(d->session);
>   		}
>   
>   		has_br_stack = perf_header__has_feat(&d->session->header,
> @@ -1181,9 +1182,9 @@ static int __cmd_diff(void)
>   
>   	data__for_each_file(i, d) {
>   		d->session = perf_session__new(&d->data, false, &pdiff.tool);
> -		if (!d->session) {
> +		if (IS_ERR(d->session)) {
> +			ret = PTR_ERR(d->session);
>   			pr_err("Failed to open %s\n", d->data.path);
> -			ret = -1;
>   			goto out_delete;
>   		}
>   
> diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
> index 238fa38..c54c186 100644
> --- a/tools/perf/builtin-evlist.c
> +++ b/tools/perf/builtin-evlist.c
> @@ -17,6 +17,7 @@
>   #include "util/session.h"
>   #include "util/data.h"
>   #include "util/debug.h"
> +#include <linux/err.h>
>   
>   static int __cmd_evlist(const char *file_name, struct perf_attr_details *details)
>   {
> @@ -30,8 +31,8 @@ static int __cmd_evlist(const char *file_name, struct perf_attr_details *details
>   	bool has_tracepoint = false;
>   
>   	session = perf_session__new(&data, 0, NULL);
> -	if (session == NULL)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	evlist__for_each_entry(session->evlist, pos) {
>   		perf_evsel__fprintf(pos, details, stdout);
> diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
> index 0401425..b11ace5 100644
> --- a/tools/perf/builtin-inject.c
> +++ b/tools/perf/builtin-inject.c
> @@ -22,6 +22,7 @@
>   #include "util/jit.h"
>   #include "util/symbol.h"
>   #include "util/thread.h"
> +#include <linux/err.h>
>   
>   #include <subcmd/parse-options.h>
>   
> @@ -834,8 +835,8 @@ int cmd_inject(int argc, const char **argv)
>   
>   	data.path = inject.input_name;
>   	inject.session = perf_session__new(&data, true, &inject.tool);
> -	if (inject.session == NULL)
> -		return -1;
> +	if (IS_ERR(inject.session))
> +		return PTR_ERR(inject.session);
>   
>   	if (zstd_init(&(inject.session->zstd_data), 0) < 0)
>   		pr_warning("Decompression initialization failed.\n");
> diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
> index 46f8289..3c723f4 100644
> --- a/tools/perf/builtin-kmem.c
> +++ b/tools/perf/builtin-kmem.c
> @@ -13,6 +13,7 @@
>   #include "util/tool.h"
>   #include "util/callchain.h"
>   #include "util/time-utils.h"
> +#include <linux/err.h>
>   
>   #include <subcmd/parse-options.h>
>   #include "util/trace-event.h"
> @@ -1953,8 +1954,8 @@ int cmd_kmem(int argc, const char **argv)
>   	data.path = input_name;
>   
>   	kmem_session = session = perf_session__new(&data, false, &perf_kmem);
> -	if (session == NULL)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	ret = -1;
>   
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 69d16ac..7468df3 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -19,6 +19,7 @@
>   #include "util/top.h"
>   #include "util/data.h"
>   #include "util/ordered-events.h"
> +#include <linux/err.h>
>   
>   #include <sys/prctl.h>
>   #ifdef HAVE_TIMERFD_SUPPORT
> @@ -1087,9 +1088,9 @@ static int read_events(struct perf_kvm_stat *kvm)
>   
>   	kvm->tool = eops;
>   	kvm->session = perf_session__new(&file, false, &kvm->tool);
> -	if (!kvm->session) {
> +	if (IS_ERR(kvm->session)) {
>   		pr_err("Initializing perf session failed\n");
> -		return -1;
> +		return PTR_ERR(kvm->session);
>   	}
>   
>   	symbol__init(&kvm->session->header.env);
> @@ -1442,8 +1443,8 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
>   	 * perf session
>   	 */
>   	kvm->session = perf_session__new(&data, false, &kvm->tool);
> -	if (kvm->session == NULL) {
> -		err = -1;
> +	if (IS_ERR(kvm->session)) {
> +		err = PTR_ERR(kvm->session);
>   		goto out;
>   	}
>   	kvm->session->evlist = kvm->evlist;
> diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
> index 38500bf..9b48d4b 100644
> --- a/tools/perf/builtin-lock.c
> +++ b/tools/perf/builtin-lock.c
> @@ -30,6 +30,7 @@
>   #include <linux/hash.h>
>   #include <linux/kernel.h>
>   #include <linux/zalloc.h>
> +#include <linux/err.h>
>   
>   static struct perf_session *session;
>   
> @@ -872,9 +873,9 @@ static int __cmd_report(bool display_info)
>   	};
>   
>   	session = perf_session__new(&data, false, &eops);
> -	if (!session) {
> +	if (IS_ERR(session)) {
>   		pr_err("Initializing perf session failed\n");
> -		return -1;
> +		return PTR_ERR(session);
>   	}
>   
>   	symbol__init(&session->header.env);
> diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
> index 9e60eda..c8406a4 100644
> --- a/tools/perf/builtin-mem.c
> +++ b/tools/perf/builtin-mem.c
> @@ -15,6 +15,7 @@
>   #include "util/debug.h"
>   #include "util/map.h"
>   #include "util/symbol.h"
> +#include <linux/err.h>
>   
>   #define MEM_OPERATION_LOAD	0x1
>   #define MEM_OPERATION_STORE	0x2
> @@ -247,8 +248,8 @@ static int report_raw_events(struct perf_mem *mem)
>   	struct perf_session *session = perf_session__new(&data, false,
>   							 &mem->tool);
>   
> -	if (session == NULL)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	if (mem->cpu_list) {
>   		ret = perf_session__cpu_bitmap(session, mem->cpu_list,
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index f71631f..993dec9 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -42,6 +42,7 @@
>   #include "util/units.h"
>   #include "util/bpf-event.h"
>   #include "asm/bug.h"
> +#include <linux/err.h>
>   
>   #include <errno.h>
>   #include <inttypes.h>
> @@ -1360,9 +1361,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>   	}
>   
>   	session = perf_session__new(data, false, tool);
> -	if (session == NULL) {
> +	if (IS_ERR(session)) {
>   		pr_err("Perf session creation failed.\n");
> -		return -1;
> +		return PTR_ERR(session);
>   	}
>   
>   	fd = perf_data__fd(data);
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index 79dfb11..4640127 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -1260,8 +1260,8 @@ int cmd_report(int argc, const char **argv)
>   
>   repeat:
>   	session = perf_session__new(&data, false, &report.tool);
> -	if (session == NULL)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	ret = evswitch__init(&report.evswitch, session->evlist, stderr);
>   	if (ret)
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 0d6b4c3..3fa84cc 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -36,6 +36,7 @@
>   #include <math.h>
>   #include <api/fs/fs.h>
>   #include <linux/time64.h>
> +#include <linux/err.h>
>   
>   #include <linux/ctype.h>
>   
> @@ -1793,9 +1794,9 @@ static int perf_sched__read_events(struct perf_sched *sched)
>   	int rc = -1;
>   
>   	session = perf_session__new(&data, false, &sched->tool);
> -	if (session == NULL) {
> -		pr_debug("No Memory for session\n");
> -		return -1;
> +	if (IS_ERR(session)) {
> +		pr_debug("Error creating perf session");
> +		return PTR_ERR(session);
>   	}
>   
>   	symbol__init(&session->header.env);
> @@ -2985,8 +2986,8 @@ static int perf_sched__timehist(struct perf_sched *sched)
>   	symbol_conf.use_callchain = sched->show_callchain;
>   
>   	session = perf_session__new(&data, false, &sched->tool);
> -	if (session == NULL)
> -		return -ENOMEM;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	evlist = session->evlist;
>   
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 1764efd1..26b0c99 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -50,6 +50,7 @@
>   #include <unistd.h>
>   #include <subcmd/pager.h>
>   #include <perf/evlist.h>
> +#include <linux/err.h>
>   
>   #include <linux/ctype.h>
>   
> @@ -3078,8 +3079,8 @@ int find_scripts(char **scripts_array, char **scripts_path_array, int num,
>   	int i = 0;
>   
>   	session = perf_session__new(&data, false, NULL);
> -	if (!session)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	snprintf(scripts_path, MAXPATHLEN, "%s/scripts", get_argv_exec_path());
>   
> @@ -3749,8 +3750,8 @@ int cmd_script(int argc, const char **argv)
>   	}
>   
>   	session = perf_session__new(&data, false, &script.tool);
> -	if (session == NULL)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	if (header || header_only) {
>   		script.tool.show_feat_hdr = SHOW_FEAT_HEADER;
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index b19df67..ed80a24 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -81,6 +81,7 @@
>   #include <unistd.h>
>   #include <sys/time.h>
>   #include <sys/resource.h>
> +#include <linux/err.h>
>   
>   #include <linux/ctype.h>
>   #include <perf/evlist.h>
> @@ -1446,9 +1447,9 @@ static int __cmd_record(int argc, const char **argv)
>   	}
>   
>   	session = perf_session__new(data, false, NULL);
> -	if (session == NULL) {
> -		pr_err("Perf session creation failed.\n");
> -		return -1;
> +	if (IS_ERR(session)) {
> +		pr_err("Perf session creation failed\n");
> +		return PTR_ERR(session);
>   	}
>   
>   	init_features(session);
> @@ -1645,8 +1646,8 @@ static int __cmd_report(int argc, const char **argv)
>   	perf_stat.data.mode = PERF_DATA_MODE_READ;
>   
>   	session = perf_session__new(&perf_stat.data, false, &perf_stat.tool);
> -	if (session == NULL)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	perf_stat.session  = session;
>   	stat_config.output = stderr;
> diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
> index 7d6a6ec..628d008 100644
> --- a/tools/perf/builtin-timechart.c
> +++ b/tools/perf/builtin-timechart.c
> @@ -36,6 +36,7 @@
>   #include "util/tool.h"
>   #include "util/data.h"
>   #include "util/debug.h"
> +#include <linux/err.h>
>   
>   #ifdef LACKS_OPEN_MEMSTREAM_PROTOTYPE
>   FILE *open_memstream(char **ptr, size_t *sizeloc);
> @@ -1605,8 +1606,8 @@ static int __cmd_timechart(struct timechart *tchart, const char *output_name)
>   							 &tchart->tool);
>   	int ret = -EINVAL;
>   
> -	if (session == NULL)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	symbol__init(&session->header.env);
>   
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index 5970723..9f19f32 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -74,6 +74,7 @@
>   #include <linux/stringify.h>
>   #include <linux/time64.h>
>   #include <linux/types.h>
> +#include <linux/err.h>
>   
>   #include <linux/ctype.h>
>   
> @@ -1675,8 +1676,8 @@ int cmd_top(int argc, const char **argv)
>   	}
>   
>   	top.session = perf_session__new(NULL, false, NULL);
> -	if (top.session == NULL) {
> -		status = -1;
> +	if (IS_ERR(top.session)) {
> +		status = PTR_ERR(top.session);
>   		goto out_delete_evlist;
>   	}
>   
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index bc44ed2..162f03c 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -3578,8 +3578,8 @@ static int trace__replay(struct trace *trace)
>   	trace->multiple_threads = true;
>   
>   	session = perf_session__new(&data, false, &trace->tool);
> -	if (session == NULL)
> -		return -1;
> +	if (IS_ERR(session))
> +		return PTR_ERR(session);
>   
>   	if (trace->opts.target.pid)
>   		symbol_conf.pid_list_str = strdup(trace->opts.target.pid);
> diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c
> index 0c26844..dbc772b 100644
> --- a/tools/perf/util/data-convert-bt.c
> +++ b/tools/perf/util/data-convert-bt.c
> @@ -30,6 +30,7 @@
>   #include "machine.h"
>   #include "config.h"
>   #include <linux/ctype.h>
> +#include <linux/err.h>
>   
>   #define pr_N(n, fmt, ...) \
>   	eprintf(n, debug_data_convert, fmt, ##__VA_ARGS__)
> @@ -1619,8 +1620,10 @@ int bt_convert__perf2ctf(const char *input, const char *path,
>   	err = -1;
>   	/* perf.data session */
>   	session = perf_session__new(&data, 0, &c.tool);
> -	if (!session)
> +	if (IS_ERR(session)) {
> +		err = PTR_ERR(session);
>   		goto free_writer;
> +	}
>   
>   	if (c.queue_size) {
>   		ordered_events__set_alloc_size(&session->ordered_events,
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 82e0438..bd5d579 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -30,6 +30,7 @@
>   #include "sample-raw.h"
>   #include "stat.h"
>   #include "arch/common.h"
> +#include <linux/err.h>
>   
>   #ifdef HAVE_ZSTD_SUPPORT
>   static int perf_session__process_compressed_event(struct perf_session *session,
> @@ -183,6 +184,7 @@ static int ordered_events__deliver_event(struct ordered_events *oe,
>   struct perf_session *perf_session__new(struct perf_data *data,
>   				       bool repipe, struct perf_tool *tool)
>   {
> +	int ret = -ENOMEM;
>   	struct perf_session *session = zalloc(sizeof(*session));
>   
>   	if (!session)
> @@ -197,13 +199,15 @@ struct perf_session *perf_session__new(struct perf_data *data,
>   
>   	perf_env__init(&session->header.env);
>   	if (data) {
> -		if (perf_data__open(data))
> +		ret = perf_data__open(data);
> +		if (ret < 0)
>   			goto out_delete;
>   
>   		session->data = data;
>   
>   		if (perf_data__is_read(data)) {
> -			if (perf_session__open(session) < 0)
> +			ret = perf_session__open(session);
> +			if (ret < 0)
>   				goto out_delete;
>   
>   			/*
> @@ -218,7 +222,8 @@ struct perf_session *perf_session__new(struct perf_data *data,
>   			perf_evlist__init_trace_event_sample_raw(session->evlist);
>   
>   			/* Open the directory data. */
> -			if (data->is_dir && perf_data__open_dir(data))
> +			ret = data->is_dir && perf_data__open_dir(data);
> +			if (ret)
>   				goto out_delete;
>   		}
>   	} else  {
> @@ -252,7 +257,7 @@ struct perf_session *perf_session__new(struct perf_data *data,
>    out_delete:
>   	perf_session__delete(session);
>    out:
> -	return NULL;
> +	return ERR_PTR(ret);
>   }
>   
>   static void perf_session__delete_threads(struct perf_session *session)
>