linux-kernel - Re: [PATCH resend] scripts: Coccinelle script for pm_runtime_* return checks with IS_ERR

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Date:	Fri, 3 Jan 2014 14:29:35 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Michal Marek <mmarek@...e.cz>
cc:	Nishanth Menon <nm@...com>, Julia.Lawall@...6.fr,
	Gilles.Muller@...6.fr, nicolas.palix@...g.fr,
	linux-kernel@...r.kernel.org, cocci@...teme.lip6.fr,
	linux-pm@...r.kernel.org, Sekhar Nori <nsekhar@...com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [PATCH resend] scripts: Coccinelle script for pm_runtime_* return
 checks with IS_ERR_VALUE


On Fri, 3 Jan 2014, Michal Marek wrote:

> On 2013-12-02 14:39, Nishanth Menon wrote:
> > As indicated by Sekhar in [1], there seems to be a tendency to use
> > IS_ERR_VALUE to check the error result for pm_runtime_* functions which
> > make no sense considering commit c48cd65 (ARM: OMAP: use consistent
> > error checking) - the error values can either be < 0 for error OR
> > 0, 1 in cases where we have success.
> >
> > So, setup a coccinelle script to help identify the same.
>
> Julia, Gilles, do you have any objections to this semantic patch?

No objections.

Acked-by: Julia Lawall <julia.lawall@...6.fr>

>
> Thanks,
> Michal
> >
> > [1] http://marc.info/?t=138472678100003&r=1&w=2
> >
> > Cc: Russell King <rmk+kernel@....linux.org.uk>
> > Reported-by: Sekhar Nori <nsekhar@...com>
> > Signed-off-by: Nishanth Menon <nm@...com>
> > ---
> > Original post: http://marc.info/?t=138559437300001&r=1&w=2
> >
> >  scripts/coccinelle/api/pm_runtime.cocci |  109 +++++++++++++++++++++++++++++++
> >  1 file changed, 109 insertions(+)
> >  create mode 100644 scripts/coccinelle/api/pm_runtime.cocci
> >
> > diff --git a/scripts/coccinelle/api/pm_runtime.cocci b/scripts/coccinelle/api/pm_runtime.cocci
> > new file mode 100644
> > index 0000000..f01789e
> > --- /dev/null
> > +++ b/scripts/coccinelle/api/pm_runtime.cocci
> > @@ -0,0 +1,109 @@
> > +/// Make sure pm_runtime_* calls does not use unnecessary IS_ERR_VALUE
> > +//
> > +// Keywords: pm_runtime
> > +// Confidence: Medium
> > +// Copyright (C) 2013 Texas Instruments Incorporated - GPLv2.
> > +// URL: http://coccinelle.lip6.fr/
> > +// Options: --include-headers
> > +
> > +virtual patch
> > +virtual context
> > +virtual org
> > +virtual report
> > +
> > +//----------------------------------------------------------
> > +//  Detection
> > +//----------------------------------------------------------
> > +
> > +@...time_bad_err_handle exists@
> > +expression ret;
> > +@@
> > +(
> > +ret = \(pm_runtime_idle\|
> > +	pm_runtime_suspend\|
> > +	pm_runtime_autosuspend\|
> > +	pm_runtime_resume\|
> > +	pm_request_idle\|
> > +	pm_request_resume\|
> > +	pm_request_autosuspend\|
> > +	pm_runtime_get\|
> > +	pm_runtime_get_sync\|
> > +	pm_runtime_put\|
> > +	pm_runtime_put_autosuspend\|
> > +	pm_runtime_put_sync\|
> > +	pm_runtime_put_sync_suspend\|
> > +	pm_runtime_put_sync_autosuspend\|
> > +	pm_runtime_set_active\|
> > +	pm_schedule_suspend\|
> > +	pm_runtime_barrier\|
> > +	pm_generic_runtime_suspend\|
> > +	pm_generic_runtime_resume\)(...);
> > +...
> > +IS_ERR_VALUE(ret)
> > +...
> > +)
> > +
> > +//----------------------------------------------------------
> > +//  For context mode
> > +//----------------------------------------------------------
> > +
> > +@...ends on runtime_bad_err_handle && context@
> > +identifier pm_runtime_api;
> > +expression ret;
> > +@@
> > +(
> > +ret = pm_runtime_api(...);
> > +...
> > +* IS_ERR_VALUE(ret)
> > +...
> > +)
> > +
> > +//----------------------------------------------------------
> > +//  For patch mode
> > +//----------------------------------------------------------
> > +
> > +@...ends on runtime_bad_err_handle && patch@
> > +identifier pm_runtime_api;
> > +expression ret;
> > +@@
> > +(
> > +ret = pm_runtime_api(...);
> > +...
> > +- IS_ERR_VALUE(ret)
> > ++ ret < 0
> > +...
> > +)
> > +
> > +//----------------------------------------------------------
> > +//  For org and report mode
> > +//----------------------------------------------------------
> > +
> > +@r depends on runtime_bad_err_handle exists@
> > +position p1, p2;
> > +identifier pm_runtime_api;
> > +expression ret;
> > +@@
> > +(
> > +ret = pm_runtime_api@p1(...);
> > +...
> > +IS_ERR_VALUE@p2(ret)
> > +...
> > +)
> > +
> > +@...ipt:python depends on org@
> > +p1 << r.p1;
> > +p2 << r.p2;
> > +pm_runtime_api << r.pm_runtime_api;
> > +@@
> > +
> > +cocci.print_main(pm_runtime_api,p1)
> > +cocci.print_secs("IS_ERR_VALUE",p2)
> > +
> > +@...ipt:python depends on report@
> > +p1 << r.p1;
> > +p2 << r.p2;
> > +pm_runtime_api << r.pm_runtime_api;
> > +@@
> > +
> > +msg = "%s returns < 0 as error. Unecessary IS_ERR_VALUE at line %s" % (pm_runtime_api, p2[0].line)
> > +coccilib.report.print_report(p1[0],msg)
> >
>
>
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