dma-debug: avoid spinlock recursion when disabling dma-debug
[ Upstream commit 3017cd63f2
]
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@linux.intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
wifi-calibration
parent
88fe30012a
commit
25fda3aef1
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@ -657,9 +657,9 @@ static struct dma_debug_entry *dma_entry_alloc(void)
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spin_lock_irqsave(&free_entries_lock, flags);
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if (list_empty(&free_entries)) {
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pr_err("DMA-API: debugging out of memory - disabling\n");
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global_disable = true;
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spin_unlock_irqrestore(&free_entries_lock, flags);
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pr_err("DMA-API: debugging out of memory - disabling\n");
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return NULL;
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}
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