linux-kernel - Re: [PATCH 2/4] SCSI-QLA4...: Less function calls in qla4xxx_is_session

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Date:	Sat, 7 Feb 2015 13:32:49 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	SF Markus Elfring <elfring@...rs.sourceforge.net>,
	"James E. J. Bottomley" <JBottomley@...allels.com>,
	QLogic-Storage-Upstream@...gic.com, linux-scsi@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/4] SCSI-QLA4...: Less function calls in
 qla4xxx_is_session_exists() after error detection

On Sat, Feb 07, 2015 at 11:11:03AM +0100, Julia Lawall wrote:
> On Sat, 7 Feb 2015, Dan Carpenter wrote:
> 
> > On Fri, Feb 06, 2015 at 11:15:13PM +0100, SF Markus Elfring wrote:
> > > diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
> > > index 2a00fd3..a7ca479 100644
> > > --- a/drivers/scsi/qla4xxx/ql4_os.c
> > > +++ b/drivers/scsi/qla4xxx/ql4_os.c
> > > @@ -6327,17 +6327,15 @@ static int qla4xxx_is_session_exists(struct scsi_qla_host *ha,
> > >  				     uint32_t *index)
> > >  {
> > >  	struct ddb_entry *ddb_entry;
> > > -	struct ql4_tuple_ddb *fw_tddb = NULL;
> > > -	struct ql4_tuple_ddb *tmp_tddb = NULL;
> > >  	int idx;
> > >  	int ret = QLA_ERROR;
> > > +	struct ql4_tuple_ddb *tmp_tddb;
> > > +	struct ql4_tuple_ddb *fw_tddb = vzalloc(sizeof(*fw_tddb));
> > >  
> > 
> > Don't do allocations in the initializers.  Same for patches 3 and 4 as
> > well.
> 
> Why not?  I can think of some reasons, but I am wondering what is the 
> precise one.

1)  People gloss over initializers without reading them.  You shouldn't
    put complicated code in initializers.  Sarah Sharp is more strict on
    this than I am.  http://www.spinics.net/lists/linux-usb/msg44389.html

2)  It means you have to put a line of separation between the allocation
    and the NULL check, but they should be next to each other.

regards,
dan carpenter

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