[-next,2/2] seq_putc: Convert to return void and convert uses too.

Using the return value of seq_putc is error-prone, so
make it return void instead.

Reverse the logic in seq_putc to make it like seq_puts.

Signed-off-by: Joe Perches <joe@perches.com>
---
 drivers/char/ipmi/ipmi_msghandler.c                   |  4 +++-
 fs/seq_file.c                                         | 11 ++++++-----
 include/linux/seq_file.h                              |  2 +-
 net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c |  4 +++-
 net/netfilter/nf_conntrack_expect.c                   |  4 +++-
 5 files changed, 16 insertions(+), 9 deletions(-)

On Mon 2014-11-10 10:58:57, Joe Perches wrote:
> Using the return value of seq_putc is error-prone, so
> make it return void instead.
> 
> Reverse the logic in seq_putc to make it like seq_puts.
> 
> Signed-off-by: Joe Perches <joe@perches.com>

Reviewed-by: Petr Mladek <pmladek@suse.cz>

The changes are correct. The show() functions should return 0
even when there is an overflow. They are called by traverse()
from seq_read() that might increase the buffer size and try again.


Best Regards,
Petr
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On Tue, Nov 11, 2014 at 02:47:40PM +0100, Petr Mladek wrote:
> On Mon 2014-11-10 10:58:57, Joe Perches wrote:
> > Using the return value of seq_putc is error-prone, so
> > make it return void instead.
> > 
> > Reverse the logic in seq_putc to make it like seq_puts.
> > 
> > Signed-off-by: Joe Perches <joe@perches.com>
> 
> Reviewed-by: Petr Mladek <pmladek@suse.cz>
> 
> The changes are correct. The show() functions should return 0
> even when there is an overflow. They are called by traverse()
> from seq_read() that might increase the buffer size and try again.

Just in case you need this for the netfilter chunks:

Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>

Thanks.
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Ok by me for the IPMI part.

Reviewed-by: Corey Minyard <cminyard@mvista.com>

On 11/10/2014 12:58 PM, Joe Perches wrote:
> Using the return value of seq_putc is error-prone, so
> make it return void instead.
>
> Reverse the logic in seq_putc to make it like seq_puts.
>
> Signed-off-by: Joe Perches <joe@perches.com>
> ---
>  drivers/char/ipmi/ipmi_msghandler.c                   |  4 +++-
>  fs/seq_file.c                                         | 11 ++++++-----
>  include/linux/seq_file.h                              |  2 +-
>  net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c |  4 +++-
>  net/netfilter/nf_conntrack_expect.c                   |  4 +++-
>  5 files changed, 16 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
> index f816211..c12fb30 100644
> --- a/drivers/char/ipmi/ipmi_msghandler.c
> +++ b/drivers/char/ipmi/ipmi_msghandler.c
> @@ -1953,7 +1953,9 @@ static int smi_ipmb_proc_show(struct seq_file *m, void *v)
>  	seq_printf(m, "%x", intf->channels[0].address);
>  	for (i = 1; i < IPMI_MAX_CHANNELS; i++)
>  		seq_printf(m, " %x", intf->channels[i].address);
> -	return seq_putc(m, '\n');
> +	seq_putc(m, '\n');
> +
> +	return 0;
>  }
>  
>  static int smi_ipmb_proc_open(struct inode *inode, struct file *file)
> diff --git a/fs/seq_file.c b/fs/seq_file.c
> index e6be05a..5ca5af9 100644
> --- a/fs/seq_file.c
> +++ b/fs/seq_file.c
> @@ -673,13 +673,14 @@ int seq_open_private(struct file *filp, const struct seq_operations *ops,
>  }
>  EXPORT_SYMBOL(seq_open_private);
>  
> -int seq_putc(struct seq_file *m, char c)
> +void seq_putc(struct seq_file *m, char c)
>  {
> -	if (m->count < m->size) {
> -		m->buf[m->count++] = c;
> -		return 0;
> +	if (m->count >= m->size) {
> +		seq_set_overflow(m);
> +		return;
>  	}
> -	return -1;
> +
> +	m->buf[m->count++] = c;
>  }
>  EXPORT_SYMBOL(seq_putc);
>  
> diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
> index 9b02cb6..c1e47ff 100644
> --- a/include/linux/seq_file.h
> +++ b/include/linux/seq_file.h
> @@ -115,7 +115,7 @@ ssize_t seq_read(struct file *, char __user *, size_t, loff_t *);
>  loff_t seq_lseek(struct file *, loff_t, int);
>  int seq_release(struct inode *, struct file *);
>  int seq_escape(struct seq_file *, const char *, const char *);
> -int seq_putc(struct seq_file *m, char c);
> +void seq_putc(struct seq_file *m, char c);
>  void seq_puts(struct seq_file *m, const char *s);
>  int seq_write(struct seq_file *seq, const void *data, size_t len);
>  
> diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
> index a460a87..f0dfe92 100644
> --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
> +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
> @@ -300,7 +300,9 @@ static int exp_seq_show(struct seq_file *s, void *v)
>  		    __nf_ct_l3proto_find(exp->tuple.src.l3num),
>  		    __nf_ct_l4proto_find(exp->tuple.src.l3num,
>  					 exp->tuple.dst.protonum));
> -	return seq_putc(s, '\n');
> +	seq_putc(s, '\n');
> +
> +	return 0;
>  }
>  
>  static const struct seq_operations exp_seq_ops = {
> diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
> index 91a1837..7a17070 100644
> --- a/net/netfilter/nf_conntrack_expect.c
> +++ b/net/netfilter/nf_conntrack_expect.c
> @@ -561,7 +561,9 @@ static int exp_seq_show(struct seq_file *s, void *v)
>  				   helper->expect_policy[expect->class].name);
>  	}
>  
> -	return seq_putc(s, '\n');
> +	seq_putc(s, '\n');
> +
> +	return 0;
>  }
>  
>  static const struct seq_operations exp_seq_ops = {

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