The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 4c11e554fb894b381a3dc47069259d87a2e6ffc9 Mon Sep 17 00:00:00 2001
From: Aaro Koskinen <aaro.koskinen@xxxxxx>
Date: Thu, 17 Mar 2016 14:17:20 -0700
Subject: [PATCH] drivers/firmware/broadcom/bcm47xx_nvram.c: fix incorrect
__ioread32_copy
Commit 1f330c327900 ("drivers/firmware/broadcom/bcm47xx_nvram.c: use
__ioread32_copy() instead of open-coding") switched to use a generic
copy function, but failed to notice that the header pointer is updated
between the two copies, resulting in bogus data being copied in the
latter one. Fix by keeping the old header pointer.
The patch fixes totally broken networking on WRT54GL router (both LAN and
WLAN interfaces fail to probe).
Fixes: 1f330c327900 ("drivers/firmware/broadcom/bcm47xx_nvram.c: use __ioread32_copy() instead of open-coding")
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
Reviewed-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Cc: Rafal Milecki <zajec5@xxxxxxxxx>
Cc: Hauke Mehrtens <hauke@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [4.4.x]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/firmware/broadcom/bcm47xx_nvram.c b/drivers/firmware/broadcom/bcm47xx_nvram.c
index 0c2f0a61b0ea..0b631e5b5b84 100644
--- a/drivers/firmware/broadcom/bcm47xx_nvram.c
+++ b/drivers/firmware/broadcom/bcm47xx_nvram.c
@@ -94,15 +94,14 @@ static int nvram_find_and_copy(void __iomem *iobase, u32 lim)
found:
__ioread32_copy(nvram_buf, header, sizeof(*header) / 4);
- header = (struct nvram_header *)nvram_buf;
- nvram_len = header->len;
+ nvram_len = ((struct nvram_header *)(nvram_buf))->len;
if (nvram_len > size) {
pr_err("The nvram size according to the header seems to be bigger than the partition on flash\n");
nvram_len = size;
}
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);
+ nvram_len, NVRAM_SPACE - 1);
nvram_len = NVRAM_SPACE - 1;
}
/* proceed reading data after header */
--
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