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net: ipa: flag duplicate memory regions

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Add a test in ipa_mem_valid() to ensure no memory region is defined
more than once, using a bitmap to record each defined memory region.
Skip over undefined regions when checking (we can have any number of
those).

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Elder 2021-06-09 17:35:02 -05:00 committed by David S. Miller
parent 75bcfde6c1
commit eadf7f9376
1 changed files with 9 additions and 0 deletions
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9
drivers/net/ipa/ipa_mem.c
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@ -217,6 +217,7 @@ static bool ipa_mem_valid_one(struct ipa *ipa, const struct ipa_mem *mem)
/* Verify each defined memory region is valid. */
static bool ipa_mem_valid(struct ipa *ipa, const struct ipa_mem_data *mem_data)
{
DECLARE_BITMAP(regions, IPA_MEM_COUNT) = { };
struct device *dev = &ipa->pdev->dev;
enum ipa_mem_id mem_id;
@ -229,6 +230,14 @@ static bool ipa_mem_valid(struct ipa *ipa, const struct ipa_mem_data *mem_data)
for (mem_id = 0; mem_id < mem_data->local_count; mem_id++) {
const struct ipa_mem *mem = &mem_data->local[mem_id];
if (mem_id == IPA_MEM_UNDEFINED)
continue;
if (__test_and_set_bit(mem->id, regions)) {
dev_err(dev, "duplicate memory region %u\n", mem->id);
return false;
}
/* Defined regions have non-zero size and/or canary count */
if (mem->size || mem->canary_count) {
if (ipa_mem_valid_one(ipa, mem))