linux-kernel - Re: [PATCH] scsi: megaraid_sas: Prevent future %p disaster

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Message-ID: <1423587337.8339.3.camel@perches.com>
Date:	Tue, 10 Feb 2015 08:55:37 -0800
From:	Joe Perches <joe@...ches.com>
To:	Kashyap Desai <kashyap.desai@...gotech.com>
Cc:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Sumit Saxena <sumit.saxena@...gotech.com>,
	Uday Lingala <uday.lingala@...gotech.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	"PDL,MEGARAIDLINUX" <megaraidlinux.pdl@...gotech.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: megaraid_sas: Prevent future %p disaster

On Tue, 2015-02-10 at 22:16 +0530, Kashyap Desai wrote:
> Acked-by: Kashyap Desai <kashyap.desai@...gotech.com>
> 
> > -----Original Message-----
> > From: Rasmus Villemoes [mailto:linux@...musvillemoes.dk]
> > Sent: Friday, February 06, 2015 8:04 PM
[]
> > There is currently no %po format extension, so currently the letters
> "on" are
> > simply skipped and the pointer is printed as expected (while missing the
> word
> > on). However, it is probably only a matter of time before someone comes
> up
> > with a %po extension, at which point this is likely to fail
> spectacularly.

Nice tool Rasmus

> > diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c
[]
> > @@ -3105,7 +3105,7 @@ megasas_internal_reset_defer_cmds(struct
> > megasas_instance *instance)
> >  	for (i = 0; i < max_cmd; i++) {
> >  		cmd = instance->cmd_list[i];
> >  		if (cmd->sync_cmd == 1 || cmd->scmd) {
> > -			printk(KERN_NOTICE "megasas: moving
> > cmd[%d]:%p:%d:%p"
> > +			printk(KERN_NOTICE "megasas: moving
> > cmd[%d]:%p:%d:%p "
> >  					"on the defer queue as
> internal\n",
> >  				defer_index, cmd, cmd->sync_cmd, cmd-
> > >scmd);
> >

It'd probably be nicer to coalesce the format.

			printk(KERN_NOTICE "megasas: moving cmd[%d]:%p:%d:%p on the defer queue as internal\n",
				defer_ndex, cmd, cmd->sync, cmd->scmd);


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