From 6a5cd60ba84723c3f6cdb8dbe26a1dc9e26a0a02 Mon Sep 17 00:00:00 2001 From: Pankaj Gupta Date: Wed, 3 May 2017 14:51:28 -0700 Subject: [PATCH] lib/dma-debug.c: make locking work for RT MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Interrupt enable/disabled with spinlock is not a valid operation for RT as it can make executing tasks sleep from a non-sleepable context. So convert it to spin_lock_irq[save, restore]. Link: http://lkml.kernel.org/r/1492065666-3816-1-git-send-email-pagupta@redhat.com Signed-off-by: Pankaj Gupta Cc: Ingo Molnar Cc: Niklas Söderlund Cc: Vinod Koul Cc: Andy Lutomirski Cc: Ville Syrjl Cc: Miles Chen Cc: Marcelo Tosatti Cc: Joerg Roedel Cc: Stanislaw Gruszka Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/dma-debug.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/lib/dma-debug.c b/lib/dma-debug.c index b157b46cc9a6..fe4d50c992df 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -942,21 +942,17 @@ static int device_dma_allocations(struct device *dev, struct dma_debug_entry **o unsigned long flags; int count = 0, i; - local_irq_save(flags); - for (i = 0; i < HASH_SIZE; ++i) { - spin_lock(&dma_entry_hash[i].lock); + spin_lock_irqsave(&dma_entry_hash[i].lock, flags); list_for_each_entry(entry, &dma_entry_hash[i].list, list) { if (entry->dev == dev) { count += 1; *out_entry = entry; } } - spin_unlock(&dma_entry_hash[i].lock); + spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags); } - local_irq_restore(flags); - return count; } -- 2.39.5