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

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Date:	Fri, 03 Jan 2014 13:57:44 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Nishanth Menon <nm@...com>, Julia.Lawall@...6.fr,
	Gilles.Muller@...6.fr, nicolas.palix@...g.fr
CC:	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 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?

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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