1 files changed, 95 insertions, 72 deletions

diff --git a/sound/core/misc.c b/sound/core/misc.c
index 3579dd7a161f..c2fda3bd90a0 100644
--- a/sound/core/misc.c
+++ b/sound/core/misc.c
@@ -10,22 +10,9 @@
 #include <linux/time.h>
 #include <linux/slab.h>
 #include <linux/ioport.h>
+#include <linux/fs.h>
 #include <sound/core.h>
 
-#ifdef CONFIG_SND_DEBUG
-
-#ifdef CONFIG_SND_DEBUG_VERBOSE
-#define DEFAULT_DEBUG_LEVEL	2
-#else
-#define DEFAULT_DEBUG_LEVEL	1
-#endif
-
-static int debug = DEFAULT_DEBUG_LEVEL;
-module_param(debug, int, 0644);
-MODULE_PARM_DESC(debug, "Debug level (0 = disable)");
-
-#endif /* CONFIG_SND_DEBUG */
-
 void release_and_free_resource(struct resource *res)
 {
 	if (res) {
@@ -35,63 +22,6 @@ void release_and_free_resource(struct resource *res)
 }
 EXPORT_SYMBOL(release_and_free_resource);
 
-#ifdef CONFIG_SND_VERBOSE_PRINTK
-/* strip the leading path if the given path is absolute */
-static const char *sanity_file_name(const char *path)
-{
-	if (*path == '/')
-		return strrchr(path, '/') + 1;
-	else
-		return path;
-}
-#endif
-
-#if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
-void __snd_printk(unsigned int level, const char *path, int line,
-		  const char *format, ...)
-{
-	va_list args;
-#ifdef CONFIG_SND_VERBOSE_PRINTK
-	int kern_level;
-	struct va_format vaf;
-	char verbose_fmt[] = KERN_DEFAULT "ALSA %s:%d %pV";
-	bool level_found = false;
-#endif
-
-#ifdef CONFIG_SND_DEBUG
-	if (debug < level)
-		return;
-#endif
-
-	va_start(args, format);
-#ifdef CONFIG_SND_VERBOSE_PRINTK
-	vaf.fmt = format;
-	vaf.va = &args;
-
-	while ((kern_level = printk_get_level(vaf.fmt)) != 0) {
-		const char *end_of_header = printk_skip_level(vaf.fmt);
-
-		/* Ignore KERN_CONT. We print filename:line for each piece. */
-		if (kern_level >= '0' && kern_level <= '7') {
-			memcpy(verbose_fmt, vaf.fmt, end_of_header - vaf.fmt);
-			level_found = true;
-		}
-
-		vaf.fmt = end_of_header;
-	}
-
-	if (!level_found && level)
-		memcpy(verbose_fmt, KERN_DEBUG, sizeof(KERN_DEBUG) - 1);
-
-	printk(verbose_fmt, sanity_file_name(path), line, &vaf);
-#else
-	vprintk(format, args);
-#endif
-	va_end(args);
-}
-EXPORT_SYMBOL_GPL(__snd_printk);
-#endif
-
 #ifdef CONFIG_PCI
 #include <linux/pci.h>
 /**
@@ -112,7 +42,7 @@ snd_pci_quirk_lookup_id(u16 vendor, u16 device,
 {
 	const struct snd_pci_quirk *q;
 
-	for (q = list; q->subvendor; q++) {
+	for (q = list; q->subvendor || q->subdevice; q++) {
 		if (q->subvendor != vendor)
 			continue;
 		if (!q->subdevice ||
@@ -145,3 +75,96 @@ snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
 }
 EXPORT_SYMBOL(snd_pci_quirk_lookup);
 #endif
+
+/*
+ * Deferred async signal helpers
+ *
+ * Below are a few helper functions to wrap the async signal handling
+ * in the deferred work.  The main purpose is to avoid the messy deadlock
+ * around tasklist_lock and co at the kill_fasync() invocation.
+ * fasync_helper() and kill_fasync() are replaced with snd_fasync_helper()
+ * and snd_kill_fasync(), respectively.  In addition, snd_fasync_free() has
+ * to be called at releasing the relevant file object.
+ */
+struct snd_fasync {
+	struct fasync_struct *fasync;
+	int signal;
+	int poll;
+	int on;
+	struct list_head list;
+};
+
+static DEFINE_SPINLOCK(snd_fasync_lock);
+static LIST_HEAD(snd_fasync_list);
+
+static void snd_fasync_work_fn(struct work_struct *work)
+{
+	struct snd_fasync *fasync;
+
+	spin_lock_irq(&snd_fasync_lock);
+	while (!list_empty(&snd_fasync_list)) {
+		fasync = list_first_entry(&snd_fasync_list, struct snd_fasync, list);
+		list_del_init(&fasync->list);
+		spin_unlock_irq(&snd_fasync_lock);
+		if (fasync->on)
+			kill_fasync(&fasync->fasync, fasync->signal, fasync->poll);
+		spin_lock_irq(&snd_fasync_lock);
+	}
+	spin_unlock_irq(&snd_fasync_lock);
+}
+
+static DECLARE_WORK(snd_fasync_work, snd_fasync_work_fn);
+
+int snd_fasync_helper(int fd, struct file *file, int on,
+		      struct snd_fasync **fasyncp)
+{
+	struct snd_fasync *fasync = NULL;
+
+	if (on) {
+		fasync = kzalloc(sizeof(*fasync), GFP_KERNEL);
+		if (!fasync)
+			return -ENOMEM;
+		INIT_LIST_HEAD(&fasync->list);
+	}
+
+	spin_lock_irq(&snd_fasync_lock);
+	if (*fasyncp) {
+		kfree(fasync);
+		fasync = *fasyncp;
+	} else {
+		if (!fasync) {
+			spin_unlock_irq(&snd_fasync_lock);
+			return 0;
+		}
+		*fasyncp = fasync;
+	}
+	fasync->on = on;
+	spin_unlock_irq(&snd_fasync_lock);
+	return fasync_helper(fd, file, on, &fasync->fasync);
+}
+EXPORT_SYMBOL_GPL(snd_fasync_helper);
+
+void snd_kill_fasync(struct snd_fasync *fasync, int signal, int poll)
+{
+	unsigned long flags;
+
+	if (!fasync || !fasync->on)
+		return;
+	spin_lock_irqsave(&snd_fasync_lock, flags);
+	fasync->signal = signal;
+	fasync->poll = poll;
+	list_move(&fasync->list, &snd_fasync_list);
+	schedule_work(&snd_fasync_work);
+	spin_unlock_irqrestore(&snd_fasync_lock, flags);
+}
+EXPORT_SYMBOL_GPL(snd_kill_fasync);
+
+void snd_fasync_free(struct snd_fasync *fasync)
+{
+	if (!fasync)
+		return;
+	fasync->on = 0;
+	flush_work(&snd_fasync_work);
+	kfree(fasync);
+}
+EXPORT_SYMBOL_GPL(snd_fasync_free);