Re: [PATCH] drivers: pnp: proc.c: Removed unnecessary varibles

From: Leon Romanovsky
Date: Mon Apr 26 2021 - 00:57:26 EST


On Fri, Apr 23, 2021 at 03:08:03PM -0600, Shuah Khan wrote:
> On 4/22/21 12:03 PM, Anupama K Patil wrote:
> > de, e are two variables of the type 'struct proc_dir_entry'
> > which can be removed to save memory. This also fixes a coding style
> > issue reported by checkpatch where we are suggested to make assignment
> > outside the if statement.
> >
>
> Sounds like a reasonable change.

It is unclear how much changes to ISA code are welcomed.
According to the Wikipedia, even Windows Vista disabled ISA PnP by default.
https://en.wikipedia.org/wiki/Legacy_Plug_and_Play#Specifications

>
> > Signed-off-by: Anupama K Patil <anupamakpatil123@xxxxxxxxx>
> > ---
> > drivers/pnp/isapnp/proc.c | 13 ++++++-------
> > 1 file changed, 6 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/pnp/isapnp/proc.c b/drivers/pnp/isapnp/proc.c
> > index 785a796430fa..1ae458c02656 100644
> > --- a/drivers/pnp/isapnp/proc.c
> > +++ b/drivers/pnp/isapnp/proc.c
> > @@ -57,21 +57,20 @@ static const struct proc_ops isapnp_proc_bus_proc_ops = {
> > static int isapnp_proc_attach_device(struct pnp_dev *dev)
> > {
> > struct pnp_card *bus = dev->card;
> > - struct proc_dir_entry *de, *e;
> > char name[16];
> > - if (!(de = bus->procdir)) {
> > + if (!bus->procdir) {
> > sprintf(name, "%02x", bus->number);
>
> It would make sense to change this to scnprintf()
>
> > - de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
> > - if (!de)
> > + bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
> > + if (!bus->procdir)
> > return -ENOMEM;
> > }
> > sprintf(name, "%02x", dev->number);
>
> It would make sense to change this to scnprintf()
>
> > - e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de,
> > + dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, bus->procdir,
> > &isapnp_proc_bus_proc_ops, dev);
> > - if (!e)
> > + if (!dev->procent)
> > return -ENOMEM;
>
> Shouldn't the procdir be deleted when proc_create_data() fails?

It needs but only if proc_mkdir() was called in this function.

Thanks

>
> > - proc_set_size(e, 256);
> > + proc_set_size(dev->procent, 256);
> > return 0;
> > }
> >
>
> Note that isapnp_proc_init() doesn't check isapnp_proc_attach_device()
> return and handle errors and cleanup.
>
> thanks,
> -- Shuah
>
>
>
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