linux-kernel - Re: 2.6.24-rc4-mm1 kobject changes broken with hvcs driver on powerpc

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Date:	Wed, 5 Dec 2007 19:42:02 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, greg@...ah.com, rsa@...ibm.com,
	apw@...dowen.org, balbir@...ibm.com
Subject: Re: 2.6.24-rc4-mm1 kobject changes broken with hvcs driver on powerpc

Hi Andrew,

The 2.6.24-rc4-mm1 kernel build fails with build failure,

  CC      drivers/char/hvcs.o
drivers/char/hvcs.c: In function ‘hvcs_open’:
drivers/char/hvcs.c:1180: error: wrong type argument to unary exclamation mark
make[2]: *** [drivers/char/hvcs.o] Error 1
make[1]: *** [drivers/char] Error 2
make: *** [drivers] Error 2

The kref_get begin void return type, check for the kobject return type
as in the previous kobject_get()
 
        if (!kref_get(&hvcsd->kref)) {
                spin_unlock_irqrestore(&hvcsd->lock, flags); 
                printk(KERN_ERR "HVCS: Kobject of open"
                        " hvcs doesn't exist.\n");
                return -EFAULT; /* Is this the right return value? */
        }

I have tested for the build failure only.

Signed-off-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
--
--- linux-2.6.24-rc4/drivers/char/hvcs.c	2007-12-05 12:17:37.000000000 +0530
+++ linux-2.6.24-rc4/drivers/char/~hvcs.c	2007-12-05 19:17:12.000000000 +0530
@@ -1177,12 +1177,8 @@ fast_open:
 	hvcsd = tty->driver_data;
 
 	spin_lock_irqsave(&hvcsd->lock, flags);
-	if (!kref_get(&hvcsd->kref)) {
-		spin_unlock_irqrestore(&hvcsd->lock, flags);
-		printk(KERN_ERR "HVCS: Kobject of open"
-			" hvcs doesn't exist.\n");
-		return -EFAULT; /* Is this the right return value? */
-	}
+	kref_get(&hvcsd->kref);
+	spin_unlock_irqrestore(&hvcsd->lock, flags);
 
 	hvcsd->open_count++;
 
--
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