[PATCH net-next 10/11] net: ipa: flag duplicate memory regions
From: Alex Elder <hidden>
Date: 2021-06-09 22:36:20
Also in:
lkml
Subsystem:
networking drivers, qcom ipa driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Alex Elder, Linus Torvalds
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 <redacted> --- drivers/net/ipa/ipa_mem.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
index e5ca6a2ac626a..7b79aeb5f68fc 100644
--- a/drivers/net/ipa/ipa_mem.c
+++ b/drivers/net/ipa/ipa_mem.c@@ -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))
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2.27.0