linux-kernel - [PATCH] fixed spinlock use in hysdn_log

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Date:	Sat, 14 Apr 2007 07:09:07 +0200
From:	Matthias Kaehlcke <matthias.kaehlcke@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	kkeil@...e.de, kai.germaschewski@....de,
	isdn4linux@...tserv.isdn4linux.de
Subject: [PATCH] fixed spinlock use in hysdn_log_close()

fixed incorrect spinlock use in hysdn_log_close(). the function
declared a spinlock on the stack and used it to 'protect' a shared
driver structure. the patch removes the declaration of hysdn_lock and 
uses card->hysdn_lock instead.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@...il.com>

---
diff --git a/drivers/isdn/hysdn/hysdn_proclog.c b/drivers/isdn/hysdn/hysdn_proclog.c
index f7e83a8..32f0b75 100644
--- a/drivers/isdn/hysdn/hysdn_proclog.c
+++ b/drivers/isdn/hysdn/hysdn_proclog.c
@@ -299,7 +299,6 @@ hysdn_log_close(struct inode *ino, struct file *filep)
 	hysdn_card *card;
 	int retval = 0;
 	unsigned long flags;
-	spinlock_t hysdn_lock = SPIN_LOCK_UNLOCKED;
 
 	lock_kernel();
 	if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
@@ -309,7 +308,7 @@ hysdn_log_close(struct inode *ino, struct file *filep)
 		/* read access -> log/debug read, mark one further file as closed */
 
 		pd = NULL;
-		spin_lock_irqsave(&hysdn_lock, flags);
+		spin_lock_irqsave(&card->hysdn_lock, flags);
 		inf = *((struct log_data **) filep->private_data);	/* get first log entry */
 		if (inf)
 			pd = (struct procdata *) inf->proc_ctrl;	/* still entries there */
@@ -332,7 +331,7 @@ hysdn_log_close(struct inode *ino, struct file *filep)
 			inf->usage_cnt--;	/* decrement usage count for buffers */
 			inf = inf->next;
 		}
-		spin_unlock_irqrestore(&hysdn_lock, flags);
+		spin_unlock_irqrestore(&card->hysdn_lock, flags);
 
 		if (pd)
 			if (pd->if_used <= 0)	/* delete buffers if last file closed */

-- 
Matthias Kaehlcke
Linux Application Developer
Barcelona

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