linux-kernel - [PATCH 1/1] Char: cyclades, fix compiler warning

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Date:	Wed, 18 Nov 2009 13:18:22 +0100
From:	Jiri Slaby <jslaby@...ell.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 1/1] Char: cyclades, fix compiler warning

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@...il.com>
: AuthorDate: Sat Sep 19 13:13:16 2009 -0700
: Commit:     Live-CD User <linux@...ux.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@...ux-foundation.org>
Cc: Alan Cox <alan@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Jiri Slaby <jslaby@...ell.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

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