diff options
Diffstat (limited to 'target/linux/brcm47xx/patches-4.1/031-09-MIPS-BCM47xx-Add-helper-variable-for-storing-NVRAM-l.patch')
| -rw-r--r-- | target/linux/brcm47xx/patches-4.1/031-09-MIPS-BCM47xx-Add-helper-variable-for-storing-NVRAM-l.patch | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-4.1/031-09-MIPS-BCM47xx-Add-helper-variable-for-storing-NVRAM-l.patch b/target/linux/brcm47xx/patches-4.1/031-09-MIPS-BCM47xx-Add-helper-variable-for-storing-NVRAM-l.patch new file mode 100644 index 0000000..053144a --- /dev/null +++ b/target/linux/brcm47xx/patches-4.1/031-09-MIPS-BCM47xx-Add-helper-variable-for-storing-NVRAM-l.patch @@ -0,0 +1,131 @@ +From f229d75f1472c4cd30f464e4a0f94f410046bd80 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com> +Date: Sat, 6 Jun 2015 23:16:23 +0200 +Subject: [PATCH] MIPS: BCM47xx: Add helper variable for storing NVRAM length +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This simplifies code just a bit (also maybe makes it a bit more +intuitive?) and will allow us to stop storing header. Right now we copy +whole NVRAM including its header to the internal buffer. It is not +needed to store a header as we don't access all these details like CRC, +flags, etc. The next improvement that should follow is copying only the +real contents. + +Signed-off-by: Rafał Miłecki <zajec5@gmail.com> +Acked-by: Hauke Mehrtens <hauke@hauke-m.de> +Cc: linux-mips@linux-mips.org +Cc: Arend van Spriel <arend@broadcom.com> +Cc: Hante Meuleman <meuleman@broadcom.com> +Patchwork: https://patchwork.linux-mips.org/patch/10535/ +Signed-off-by: Ralf Baechle <ralf@linux-mips.org> +--- + arch/mips/bcm47xx/nvram.c | 37 ++++++++++++++++--------------------- + 1 file changed, 16 insertions(+), 21 deletions(-) + +--- a/arch/mips/bcm47xx/nvram.c ++++ b/arch/mips/bcm47xx/nvram.c +@@ -35,6 +35,7 @@ struct nvram_header { + }; + + static char nvram_buf[NVRAM_SPACE]; ++static size_t nvram_len; + static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000}; + + static u32 find_nvram_size(void __iomem *end) +@@ -60,7 +61,7 @@ static int nvram_find_and_copy(void __io + u32 *src, *dst; + u32 size; + +- if (nvram_buf[0]) { ++ if (nvram_len) { + pr_warn("nvram already initialized\n"); + return -EEXIST; + } +@@ -99,17 +100,18 @@ found: + for (i = 0; i < sizeof(struct nvram_header); i += 4) + *dst++ = __raw_readl(src++); + header = (struct nvram_header *)nvram_buf; +- if (header->len > size) { ++ nvram_len = header->len; ++ if (nvram_len > size) { + pr_err("The nvram size according to the header seems to be bigger than the partition on flash\n"); +- header->len = size; ++ nvram_len = size; + } +- if (header->len >= NVRAM_SPACE) { ++ if (nvram_len >= NVRAM_SPACE) { + pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n", + header->len, NVRAM_SPACE - 1); +- header->len = NVRAM_SPACE - 1; ++ nvram_len = NVRAM_SPACE - 1; + } + /* proceed reading data after header */ +- for (; i < header->len; i += 4) ++ for (; i < nvram_len; i += 4) + *dst++ = readl(src++); + nvram_buf[NVRAM_SPACE - 1] = '\0'; + +@@ -144,7 +146,6 @@ static int nvram_init(void) + #ifdef CONFIG_MTD + struct mtd_info *mtd; + struct nvram_header header; +- struct nvram_header *pheader; + size_t bytes_read; + int err; + +@@ -155,20 +156,16 @@ static int nvram_init(void) + err = mtd_read(mtd, 0, sizeof(header), &bytes_read, (uint8_t *)&header); + if (!err && header.magic == NVRAM_MAGIC && + header.len > sizeof(header)) { +- if (header.len >= NVRAM_SPACE) { ++ nvram_len = header.len; ++ if (nvram_len >= NVRAM_SPACE) { + pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n", + header.len, NVRAM_SPACE); +- header.len = NVRAM_SPACE - 1; ++ nvram_len = NVRAM_SPACE - 1; + } + +- err = mtd_read(mtd, 0, header.len, &bytes_read, ++ err = mtd_read(mtd, 0, nvram_len, &nvram_len, + (u8 *)nvram_buf); +- if (err) +- return err; +- +- pheader = (struct nvram_header *)nvram_buf; +- pheader->len = header.len; +- return 0; ++ return err; + } + #endif + +@@ -183,7 +180,7 @@ int bcm47xx_nvram_getenv(const char *nam + if (!name) + return -EINVAL; + +- if (!nvram_buf[0]) { ++ if (!nvram_len) { + err = nvram_init(); + if (err) + return err; +@@ -231,16 +228,14 @@ char *bcm47xx_nvram_get_contents(size_t + { + int err; + char *nvram; +- struct nvram_header *header; + +- if (!nvram_buf[0]) { ++ if (!nvram_len) { + err = nvram_init(); + if (err) + return NULL; + } + +- header = (struct nvram_header *)nvram_buf; +- *nvram_size = header->len - sizeof(struct nvram_header); ++ *nvram_size = nvram_len - sizeof(struct nvram_header); + nvram = vmalloc(*nvram_size); + if (!nvram) + return NULL; |