On Wed, Nov 13, 2013 at 01:56:08PM -0700, Shuah Khan wrote:
> dma-debug checks to verify if driver validated the address returned by
> dma mapping routines when driver does unmap. If a driver doesn't call
> unmap, failure to check mapping errors isn't detected and reported.
>
> Enhancing existing bus notifier_call dma_debug_device_change() to check
> for mapping errors at the same time it detects leaked dma buffers for
> BUS_NOTIFY_UNBOUND_DRIVER event. It scans for mapping errors and if any
> found, prints one warning message that includes mapping error count.
>
> Signed-off-by: Shuah Khan <shuah...@samsung.com>
> ---
> lib/dma-debug.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/lib/dma-debug.c b/lib/dma-debug.c
> index d87a17a..e34865e 100644
> --- a/lib/dma-debug.c
> +++ b/lib/dma-debug.c
> @@ -717,6 +717,7 @@ static int device_dma_allocations(struct device *dev,
> struct dma_debug_entry **o
> struct dma_debug_entry *entry;
> unsigned long flags;
> int count = 0, i;
> + int map_err_cnt = 0;
>
> local_irq_save(flags);
>
> @@ -724,6 +725,8 @@ static int device_dma_allocations(struct device *dev,
> struct dma_debug_entry **o
> spin_lock(&dma_entry_hash[i].lock);
> list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
> if (entry->dev == dev) {
> + if (entry->map_err_type == MAP_ERR_NOT_CHECKED)
> + map_err_cnt += 1;
> count += 1;
> *out_entry = entry;
I think it is better to check for this in a seperate function and use
err_printk instead of dev_warn in the end to print the errors.
The new function can then be called in the dma_debug_device_change
callback like device_dma_allocations is.
Joerg
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