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 <stable@xxxxxxxxxxxxxxx> know about it.
>From 3017cd63f26fc655d56875aaf497153ba60e9edf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Thu, 26 May 2016 15:16:25 -0700
Subject: dma-debug: avoid spinlock recursion when disabling dma-debug
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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
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.
Link: http://lkml.kernel.org/r/1463678421-18683-1-git-send-email-ville.syrjala@xxxxxxxxxxxxxxx
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
lib/dma-debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -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 ville.syrjala@xxxxxxxxxxxxxxx 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
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