Patch "dma-debug: avoid spinlock recursion when disabling dma-debug" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

dma-debug: avoid spinlock recursion when disabling dma-debug

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
dma-debug-avoid-spinlock-recursion-when-disabling-dma-debug.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <[email protected]>
Date: Thu, 26 May 2016 15:16:25 -0700
Subject: dma-debug: avoid spinlock recursion when disabling dma-debug
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Ville Syrjälä <[email protected]>

commit 3017cd63f26fc655d56875aaf497153ba60e9edf upstream.

With netconsole (at least) the pr_err("... disablingn") call can recurse back into the dma-debug code, where it'll try to grab free_entries_lock again. Avoid the problem by doing the printk after dropping the lock.

---
 lib/dma-debug.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -657,9 +657,9 @@ static struct dma_debug_entry *dma_entry
 	spin_lock_irqsave(&free_entries_lock, flags);
 
 	if (list_empty(&free_entries)) {
-		pr_err("DMA-API: debugging out of memory - disabling\n");
 		global_disable = true;
 		spin_unlock_irqrestore(&free_entries_lock, flags);
+		pr_err("DMA-API: debugging out of memory - disabling\n");
 		return NULL;
 	}
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/mfd-intel_soc_pmic_core-terminate-panel-control-gpio-lookup-table-correctly.patch queue-4.4/drm-i915-don-t-leave-old-junk-in-ilk-active-watermarks-on-readout.patch queue-4.4/dma-debug-avoid-spinlock-recursion-when-disabling-dma-debug.patch