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Koen Kooi
ebbeb55561
Also add script used to generate patches and SRC_URI Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
45 lines
1.7 KiB
Diff
45 lines
1.7 KiB
Diff
From a8007086ee166819c511c09b122c46c807377fe1 Mon Sep 17 00:00:00 2001
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From: Wu Fengguang <fengguang.wu@intel.com>
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Date: Sat, 4 Feb 2012 20:54:03 -0600
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Subject: [PATCH 16/30] writeback: fix dereferencing NULL bdi->dev on
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trace_writeback_queue
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commit 977b7e3a52a7421ad33a393a38ece59f3d41c2fa upstream.
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When a SD card is hot removed without umount, del_gendisk() will call
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bdi_unregister() without destroying/freeing it. This leaves the bdi in
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the bdi->dev = NULL, bdi->wb.task = NULL, bdi->bdi_list removed state.
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When sync(2) gets the bdi before bdi_unregister() and calls
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bdi_queue_work() after the unregister, trace_writeback_queue will be
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dereferencing the NULL bdi->dev. Fix it with a simple test for NULL.
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LKML-reference: http://lkml.org/lkml/2012/1/18/346
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Reported-by: Rabin Vincent <rabin@rab.in>
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Tested-by: Namjae Jeon <linkinjeon@gmail.com>
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Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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include/trace/events/writeback.h | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
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index 46e389c..1f48f14 100644
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--- a/include/trace/events/writeback.h
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+++ b/include/trace/events/writeback.h
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@@ -47,7 +47,10 @@ DECLARE_EVENT_CLASS(writeback_work_class,
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__field(int, reason)
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),
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TP_fast_assign(
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- strncpy(__entry->name, dev_name(bdi->dev), 32);
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+ struct device *dev = bdi->dev;
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+ if (!dev)
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+ dev = default_backing_dev_info.dev;
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+ strncpy(__entry->name, dev_name(dev), 32);
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__entry->nr_pages = work->nr_pages;
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__entry->sb_dev = work->sb ? work->sb->s_dev : 0;
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__entry->sync_mode = work->sync_mode;
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--
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1.7.9.4
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