From ada79289735fea37e755bbefc4403c989e66f4b1 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 25 Jun 2018 19:58:51 -0500 Subject: [PATCH] soc: qcom: smem: introduce qcom_smem_partition_header() Create a new function qcom_smem_partition_header() to encapsulate validating locating a partition header and validating information found within it. This will be built up over a few commits to make it more obvious how the common function is replacing duplicated code elsewhere. Initially it just verifies the header has the right magic number. Signed-off-by: Alex Elder Signed-off-by: Andy Gross --- drivers/soc/qcom/smem.c | 45 ++++++++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 14 deletions(-) diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c index 91f814900ca1..eb530a6770c1 100644 --- a/drivers/soc/qcom/smem.c +++ b/drivers/soc/qcom/smem.c @@ -723,6 +723,29 @@ static u32 qcom_smem_get_item_count(struct qcom_smem *smem) return le16_to_cpu(info->num_items); } +/* + * Validate the partition header for a partition whose partition + * table entry is supplied. Returns a pointer to its header if + * valid, or a null pointer otherwise. + */ +static struct smem_partition_header * +qcom_smem_partition_header(struct qcom_smem *smem, + struct smem_ptable_entry *entry) +{ + struct smem_partition_header *header; + + header = smem->regions[0].virt_base + le32_to_cpu(entry->offset); + + if (memcmp(header->magic, SMEM_PART_MAGIC, sizeof(header->magic))) { + dev_err(smem->dev, "bad partition magic %02x %02x %02x %02x\n", + header->magic[0], header->magic[1], + header->magic[2], header->magic[3]); + return NULL; + } + + return header; +} + static int qcom_smem_set_global_partition(struct qcom_smem *smem) { struct smem_partition_header *header; @@ -761,15 +784,13 @@ static int qcom_smem_set_global_partition(struct qcom_smem *smem) return -EINVAL; } - header = smem->regions[0].virt_base + le32_to_cpu(entry->offset); + header = qcom_smem_partition_header(smem, entry); + if (!header) + return -EINVAL; + host0 = le16_to_cpu(header->host0); host1 = le16_to_cpu(header->host1); - if (memcmp(header->magic, SMEM_PART_MAGIC, sizeof(header->magic))) { - dev_err(smem->dev, "Global partition has invalid magic\n"); - return -EINVAL; - } - if (host0 != SMEM_GLOBAL_HOST || host1 != SMEM_GLOBAL_HOST) { dev_err(smem->dev, "Global partition hosts are invalid\n"); return -EINVAL; @@ -837,17 +858,13 @@ static int qcom_smem_enumerate_partitions(struct qcom_smem *smem, return -EINVAL; } - header = smem->regions[0].virt_base + le32_to_cpu(entry->offset); + header = qcom_smem_partition_header(smem, entry); + if (!header) + return -EINVAL; + host0 = le16_to_cpu(header->host0); host1 = le16_to_cpu(header->host1); - if (memcmp(header->magic, SMEM_PART_MAGIC, - sizeof(header->magic))) { - dev_err(smem->dev, - "Partition %d has invalid magic\n", i); - return -EINVAL; - } - if (host0 != host0 || host1 != host1) { dev_err(smem->dev, "Partition %d hosts don't match\n", i);