* [PATCH 1/1] Char: cyclades, fix compiler warning
[not found] <20091114080505.7715b022.akpm@linux-foundation.org>
@ 2009-11-18 12:18 ` Jiri Slaby
2009-11-20 17:43 ` Greg KH
0 siblings, 1 reply; 3+ messages in thread
From: Jiri Slaby @ 2009-11-18 12:18 UTC (permalink / raw)
To: akpm; +Cc: linux-kernel, Alan Cox, Greg Kroah-Hartman
With gcc 4.0.2:
drivers/char/cyclades.c: In function 'cyy_interrupt':
drivers/char/cyclades.c:581: warning: 'info' may be used uninitialized in this function
introduced by
: commit 3aeea5b92210083c7cffd4f08a0bb141d3f2d574
: Author: Jiri Slaby <jirislaby@gmail.com>
: AuthorDate: Sat Sep 19 13:13:16 2009 -0700
: Commit: Live-CD User <linux@linux.site>
: CommitDate: Sat Sep 19 13:13:16 2009 -0700
:
: cyclades: introduce cyy_readb/writeb
In fact the true branch which uses uninitialized 'info' can never
happen because chip is always less than ->nchips and channel is
always less than 4 which we alloc.
So behave similar to rx handling and remove the test completely.
I wonder why gcc 4.4.1 doesn't spit a word.
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Jiri Slaby <jslaby@novell.com>
---
drivers/char/cyclades.c | 8 +-------
1 files changed, 1 insertions(+), 7 deletions(-)
diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index a188c05..e026f24 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -595,14 +595,8 @@ static void cyy_chip_tx(struct cyclades_card *cinfo, unsigned int chip,
channel = save_xir & CyIRChannel;
save_car = readb(base_addr + (CyCAR << index));
cy_writeb(base_addr + (CyCAR << index), save_xir);
- info = &cinfo->ports[channel + chip * 4];
- /* validate the port# (as configured and open) */
- if (channel + chip * 4 >= cinfo->nports) {
- cy_writeb(base_addr + (CySRER << index),
- readb(base_addr + (CySRER << index)) & ~CyTxRdy);
- goto end;
- }
+ info = &cinfo->ports[channel + chip * 4];
tty = tty_port_tty_get(&info->port);
if (tty == NULL) {
cyy_writeb(info, CySRER, cyy_readb(info, CySRER) & ~CyTxRdy);
--
1.6.4.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH 1/1] Char: cyclades, fix compiler warning
2009-11-18 12:18 ` [PATCH 1/1] Char: cyclades, fix compiler warning Jiri Slaby
@ 2009-11-20 17:43 ` Greg KH
2009-11-20 23:51 ` Andrew Morton
0 siblings, 1 reply; 3+ messages in thread
From: Greg KH @ 2009-11-20 17:43 UTC (permalink / raw)
To: Jiri Slaby; +Cc: akpm, linux-kernel, Alan Cox, Greg Kroah-Hartman
On Wed, Nov 18, 2009 at 01:18:22PM +0100, Jiri Slaby wrote:
> With gcc 4.0.2:
> drivers/char/cyclades.c: In function 'cyy_interrupt':
> drivers/char/cyclades.c:581: warning: 'info' may be used uninitialized in this function
>
> introduced by
>
> : commit 3aeea5b92210083c7cffd4f08a0bb141d3f2d574
> : Author: Jiri Slaby <jirislaby@gmail.com>
> : AuthorDate: Sat Sep 19 13:13:16 2009 -0700
> : Commit: Live-CD User <linux@linux.site>
> : CommitDate: Sat Sep 19 13:13:16 2009 -0700
> :
> : cyclades: introduce cyy_readb/writeb
>
> In fact the true branch which uses uninitialized 'info' can never
> happen because chip is always less than ->nchips and channel is
> always less than 4 which we alloc.
>
> So behave similar to rx handling and remove the test completely.
>
> I wonder why gcc 4.4.1 doesn't spit a word.
>
> Reported-by: Andrew Morton <akpm@linux-foundation.org>
> Cc: Alan Cox <alan@linux.intel.com>
> Cc: Greg Kroah-Hartman <gregkh@suse.de>
> Signed-off-by: Jiri Slaby <jslaby@novell.com>
> ---
> drivers/char/cyclades.c | 8 +-------
> 1 files changed, 1 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
> index a188c05..e026f24 100644
> --- a/drivers/char/cyclades.c
> +++ b/drivers/char/cyclades.c
> @@ -595,14 +595,8 @@ static void cyy_chip_tx(struct cyclades_card *cinfo, unsigned int chip,
> channel = save_xir & CyIRChannel;
> save_car = readb(base_addr + (CyCAR << index));
> cy_writeb(base_addr + (CyCAR << index), save_xir);
> - info = &cinfo->ports[channel + chip * 4];
>
> - /* validate the port# (as configured and open) */
> - if (channel + chip * 4 >= cinfo->nports) {
> - cy_writeb(base_addr + (CySRER << index),
> - readb(base_addr + (CySRER << index)) & ~CyTxRdy);
> - goto end;
> - }
> + info = &cinfo->ports[channel + chip * 4];
Wierd, but this doesn't apply at all to my or Linus's tree. Are there
some other cyclades patch floating around out there that is needed here
before this one?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH 1/1] Char: cyclades, fix compiler warning
2009-11-20 17:43 ` Greg KH
@ 2009-11-20 23:51 ` Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2009-11-20 23:51 UTC (permalink / raw)
To: Greg KH; +Cc: Jiri Slaby, linux-kernel, Alan Cox, Greg Kroah-Hartman
On Fri, 20 Nov 2009 09:43:28 -0800
Greg KH <greg@kroah.com> wrote:
> > diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
> > index a188c05..e026f24 100644
> > --- a/drivers/char/cyclades.c
> > +++ b/drivers/char/cyclades.c
> > @@ -595,14 +595,8 @@ static void cyy_chip_tx(struct cyclades_card *cinfo, unsigned int chip,
> > channel = save_xir & CyIRChannel;
> > save_car = readb(base_addr + (CyCAR << index));
> > cy_writeb(base_addr + (CyCAR << index), save_xir);
> > - info = &cinfo->ports[channel + chip * 4];
> >
> > - /* validate the port# (as configured and open) */
> > - if (channel + chip * 4 >= cinfo->nports) {
> > - cy_writeb(base_addr + (CySRER << index),
> > - readb(base_addr + (CySRER << index)) & ~CyTxRdy);
> > - goto end;
> > - }
> > + info = &cinfo->ports[channel + chip * 4];
>
> Wierd, but this doesn't apply at all to my or Linus's tree. Are there
> some other cyclades patch floating around out there that is needed here
> before this one?
Jiri's patch is based on top of my initial half-assed fix. Against
mainline:
From: Jiri Slaby <jslaby@novell.com>
With gcc 4.0.2:
drivers/char/cyclades.c: In function 'cyy_interrupt':
drivers/char/cyclades.c:581: warning: 'info' may be used uninitialized in this function
introduced by
: commit 3aeea5b92210083c7cffd4f08a0bb141d3f2d574
: Author: Jiri Slaby <jirislaby@gmail.com>
: AuthorDate: Sat Sep 19 13:13:16 2009 -0700
: Commit: Live-CD User <linux@linux.site>
: CommitDate: Sat Sep 19 13:13:16 2009 -0700
:
: cyclades: introduce cyy_readb/writeb
In fact the true branch which uses uninitialized 'info' can never
happen because chip is always less than ->nchips and channel is
always less than 4 which we alloc.
So behave similar to rx handling and remove the test completely.
I wonder why gcc 4.4.1 doesn't spit a word.
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Jiri Slaby <jslaby@novell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/char/cyclades.c | 6 ------
1 file changed, 6 deletions(-)
diff -puN drivers/char/cyclades.c~char-cyclades-fix-compiler-warning drivers/char/cyclades.c
--- a/drivers/char/cyclades.c~char-cyclades-fix-compiler-warning
+++ a/drivers/char/cyclades.c
@@ -598,12 +598,6 @@ static void cyy_chip_tx(struct cyclades_
save_car = readb(base_addr + (CyCAR << index));
cy_writeb(base_addr + (CyCAR << index), save_xir);
- /* validate the port# (as configured and open) */
- if (channel + chip * 4 >= cinfo->nports) {
- cy_writeb(base_addr + (CySRER << index),
- readb(base_addr + (CySRER << index)) & ~CyTxRdy);
- goto end;
- }
info = &cinfo->ports[channel + chip * 4];
tty = tty_port_tty_get(&info->port);
if (tty == NULL) {
_
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2009-11-20 23:51 UTC | newest]
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[not found] <20091114080505.7715b022.akpm@linux-foundation.org>
2009-11-18 12:18 ` [PATCH 1/1] Char: cyclades, fix compiler warning Jiri Slaby
2009-11-20 17:43 ` Greg KH
2009-11-20 23:51 ` Andrew Morton
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