linux-kernel - [PATCH 2/9] remoteproc: Refactor function rproc_elf_find_rsc

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Date:	Sun, 10 Feb 2013 12:39:05 +0100
From:	sjur.brandeland@...ricsson.com
To:	Ido Yariv <ido@...ery.com>, Ohad Ben-Cohen <ohad@...ery.com>
Cc:	linux-kernel@...r.kernel.org,
	Dmitry Tarnyagin <dmitry.tarnyagin@...ricsson.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Erwan Yvin <erwan.yvin@...ricsson.com>, sjur@...ndeland.net,
	Sjur Brændeland <sjur.brandeland@...ricsson.com>
Subject: [PATCH 2/9] remoteproc: Refactor function rproc_elf_find_rsc_table

From: Sjur Brændeland <sjur.brandeland@...ricsson.com>

Refactor rproc_elf_find_rsc_table and split out the scanning
for the section header named resource table. This is done to
prepare for loading firmware once.

Signed-off-by: Sjur Brændeland <sjur.brandeland@...ricsson.com>
---
 drivers/remoteproc/remoteproc_elf_loader.c |   79 ++++++++++++++++++----------
 1 files changed, 52 insertions(+), 27 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
index 0d36f94..a958950 100644
--- a/drivers/remoteproc/remoteproc_elf_loader.c
+++ b/drivers/remoteproc/remoteproc_elf_loader.c
@@ -208,38 +208,19 @@ rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
 	return ret;
 }
 
-/**
- * rproc_elf_find_rsc_table() - find the resource table
- * @rproc: the rproc handle
- * @fw: the ELF firmware image
- * @tablesz: place holder for providing back the table size
- *
- * This function finds the resource table inside the remote processor's
- * firmware. It is used both upon the registration of @rproc (in order
- * to look for and register the supported virito devices), and when the
- * @rproc is booted.
- *
- * Returns the pointer to the resource table if it is found, and write its
- * size into @tablesz. If a valid table isn't found, NULL is returned
- * (and @tablesz isn't set).
- */
-static struct resource_table *
-rproc_elf_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
-							int *tablesz)
+static struct elf32_shdr *
+find_rsc_shdr(struct device *dev, struct elf32_hdr *ehdr, size_t fw_size)
 {
-	struct elf32_hdr *ehdr;
 	struct elf32_shdr *shdr;
+	int i;
 	const char *name_table;
-	struct device *dev = &rproc->dev;
 	struct resource_table *table = NULL;
-	int i;
-	const u8 *elf_data = fw->data;
+	const u8 *elf_data = (void *)ehdr;
 
-	ehdr = (struct elf32_hdr *)elf_data;
+	/* look for the resource table and handle it */
 	shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);
 	name_table = elf_data + shdr[ehdr->e_shstrndx].sh_offset;
 
-	/* look for the resource table and handle it */
 	for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
 		int size = shdr->sh_size;
 		int offset = shdr->sh_offset;
@@ -250,7 +231,7 @@ rproc_elf_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
 		table = (struct resource_table *)(elf_data + offset);
 
 		/* make sure we have the entire table */
-		if (offset + size > fw->size) {
+		if (offset + size > fw_size) {
 			dev_err(dev, "resource table truncated\n");
 			return NULL;
 		}
@@ -280,10 +261,54 @@ rproc_elf_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
 			return NULL;
 		}
 
-		*tablesz = shdr->sh_size;
-		break;
+		return shdr;
 	}
 
+	return NULL;
+}
+
+/**
+ * rproc_elf_find_rsc_table() - find the resource table
+ * @rproc: the rproc handle
+ * @fw: the ELF firmware image
+ * @tablesz: place holder for providing back the table size
+ *
+ * This function finds the resource table inside the remote processor's
+ * firmware. It is used both upon the registration of @rproc (in order
+ * to look for and register the supported virito devices), and when the
+ * @rproc is booted.
+ *
+ * Returns the pointer to the resource table if it is found, and write its
+ * size into @tablesz. If a valid table isn't found, NULL is returned
+ * (and @tablesz isn't set).
+ */
+static struct resource_table *
+rproc_elf_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
+							int *tablesz)
+{
+	struct elf32_hdr *ehdr;
+	struct elf32_shdr *shdr;
+
+	struct device *dev = &rproc->dev;
+	struct resource_table *table = NULL;
+
+	const u8 *elf_data = fw->data;
+
+	ehdr = (struct elf32_hdr *)elf_data;
+
+	shdr = find_rsc_shdr(dev, ehdr, fw->size);
+	if (!shdr)
+		return NULL;
+
+	/* make sure we have the entire table */
+	if (shdr->sh_offset + shdr->sh_size > fw->size) {
+		dev_err(dev, "resource table truncated\n");
+		return NULL;
+	}
+
+	table = (struct resource_table *)(elf_data + shdr->sh_offset);
+	*tablesz = shdr->sh_size;
+
 	return table;
 }
 
-- 
1.7.5.4

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