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dma: of-dma: protect list write operation by spin_lock

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It's possible to have an inconsistency in the list due to unprotected operation
on it. The patch adds a proper locking on the list operation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andy Shevchenko 2013-02-14 11:00:15 +02:00 committed by Vinod Koul
parent 7dd1452525
commit 88b386c0a7
1 changed files with 2 additions and 0 deletions
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2
drivers/dma/of-dma.c
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@ -118,7 +118,9 @@ int of_dma_controller_register(struct device_node *np,
ofdma->use_count = 0; ofdma->use_count = 0;
/* Now queue of_dma controller structure in list */ /* Now queue of_dma controller structure in list */
spin_lock(&of_dma_lock);
list_add_tail(&ofdma->of_dma_controllers, &of_dma_list); list_add_tail(&ofdma->of_dma_controllers, &of_dma_list);
spin_unlock(&of_dma_lock);
return 0; return 0;
} }