linux-kernel - [ 026/122] ALSA: hda - Dont power up when not powered down.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20120807221950.574861686@linuxfoundation.org>
Date:	Tue,  7 Aug 2012 15:25:14 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Dylan Reid <dgreid@...omium.org>,
	Takashi Iwai <tiwai@...e.de>
Subject: [ 026/122] ALSA: hda - Dont power up when not powered down.

From: Greg KH <gregkh@...uxfoundation.org>

3.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dylan Reid <dgreid@...omium.org>

commit b43d224767e426cf1a8b6622d1d172f2b2b0e857 upstream.

After cancel_delayed_work_sync returns, the power down work either never
started (power_on == 1) or finished (power_on == 0).  In the former case
there is no need to power up again.

Signed-off-by: Dylan Reid <dgreid@...omium.org>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/pci/hda/hda_codec.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -4418,6 +4418,13 @@ static void __snd_hda_power_up(struct hd
 	cancel_delayed_work_sync(&codec->power_work);
 
 	spin_lock(&codec->power_lock);
+	/* If the power down delayed work was cancelled above before starting,
+	 * then there is no need to go through power up here.
+	 */
+	if (codec->power_on) {
+		spin_unlock(&codec->power_lock);
+		return;
+	}
 	trace_hda_power_up(codec);
 	snd_hda_update_power_acct(codec);
 	codec->power_on = 1;


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/