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From: Julia Lawall <julia@diku.dk>
To: corentincj@iksaif.net, sziwan@users.sourceforge.net,
	acpi4asus-user@lists.sourceforge.net,
	linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH 2/9] drivers/acpi/asus_acpi.c: Correct use of ! and &
Date: Tue, 26 Feb 2008 21:42:37 +0100 (CET)	[thread overview]
Message-ID: <Pine.LNX.4.64.0802262142120.18200@ask.diku.dk> (raw)

From: Julia Lawall <julia@diku.dk>

In commit e6bafba5b4765a5a252f1b8d31cbf6d2459da337, a bug was fixed that
involved converting !x & y to !(x & y).  The code below shows the same
pattern, and thus should perhaps be fixed in the same way.

This is not tested and clearly changes the semantics, so it is only
something to consider.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@ expression E1,E2; @@
(
  !E1 & !E2
|
- !E1 & E2
+ !(E1 & E2)
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>

---

diff -u -p a/drivers/acpi/asus_acpi.c b/drivers/acpi/asus_acpi.c
--- a/drivers/acpi/asus_acpi.c 2008-02-10 22:34:05.000000000 +0100
+++ b/drivers/acpi/asus_acpi.c 2008-02-26 08:00:42.000000000 +0100
@@ -610,7 +610,7 @@ write_led(const char __user * buffer, un
 	    (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 
 	if (invert)		/* invert target value */
-		led_out = !led_out & 0x1;
+		led_out = !(led_out & 0x1);
 
 	if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 		printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",

             reply	other threads:[~2008-02-26 20:42 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-26 20:42 Julia Lawall [this message]
2008-02-27 17:03 ` Karol Kozimor
2008-02-27 17:41   ` Julia Lawall
2008-02-27 18:29   ` Mark Pearson
2008-02-29  5:55     ` Andrew Morton
2008-02-29  6:10       ` Matthew Wilcox
2008-02-29  6:14         ` Matthew Wilcox
2008-02-29  6:19         ` Andrew Morton
2008-02-29 11:01       ` Julia Lawall
2008-02-29 11:08         ` Andrew Morton
2008-02-29 18:06       ` Mark Pearson
2008-02-29 21:33         ` Andrew Morton

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