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a1abf71827
1. Check for -EPROBE_DEFER
If it occurs we have to return immediately. Trying other properties
could result in another error and ignoring -EPROBE_DEFER which has a
special meaning.
2. Check for read result
Assuming property->read() success can result in NULL pointer
dereference. It happens e.g. for "mac-address" with NVMEM cell
containing invalid MAC.
3. Simplify code
Don't move cell reading & nvmem_cell_put() into a loop. Simplify loop
code.
Fixes: ecd81de7a5 ("ath79: add nvmem cell mac-address-ascii support")
Cc: Yousong Zhou <yszhou4tech@gmail.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
112 lines
2.8 KiB
Diff
112 lines
2.8 KiB
Diff
From: Yousong Zhou <yszhou4tech@gmail.com>
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Subject: [PATCH] ath79: add nvmem cell mac-address-ascii support
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This is needed for devices with mac address stored in ascii format, e.g.
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HiWiFi HC6361 to be ported in the following patch.
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Submitted-by: Yousong Zhou <yszhou4tech@gmail.com>
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---
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net/ethernet/eth.c | 83 ++++++++++++------
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1 files changed, 72 insertions(+), 11 deletions(-)
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--- a/net/ethernet/eth.c
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+++ b/net/ethernet/eth.c
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@@ -539,6 +539,63 @@ int eth_platform_get_mac_address(struct
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}
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EXPORT_SYMBOL(eth_platform_get_mac_address);
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+static void *nvmem_cell_get_mac_address(struct nvmem_cell *cell)
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+{
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+ size_t len;
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+ void *mac;
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+
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+ mac = nvmem_cell_read(cell, &len);
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+ if (IS_ERR(mac))
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+ return mac;
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+ if (len != ETH_ALEN) {
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+ kfree(mac);
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+ return ERR_PTR(-EINVAL);
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+ }
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+ return mac;
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+}
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+
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+static void *nvmem_cell_get_mac_address_ascii(struct nvmem_cell *cell)
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+{
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+ size_t len;
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+ int ret;
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+ void *mac_ascii;
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+ u8 *mac;
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+
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+ mac_ascii = nvmem_cell_read(cell, &len);
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+ if (IS_ERR(mac_ascii))
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+ return mac_ascii;
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+ if (len != ETH_ALEN*2+5) {
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+ kfree(mac_ascii);
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+ return ERR_PTR(-EINVAL);
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+ }
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+ mac = kmalloc(ETH_ALEN, GFP_KERNEL);
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+ if (!mac) {
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+ kfree(mac_ascii);
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+ return ERR_PTR(-ENOMEM);
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+ }
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+ ret = sscanf(mac_ascii, "%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx",
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+ &mac[0], &mac[1], &mac[2],
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+ &mac[3], &mac[4], &mac[5]);
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+ kfree(mac_ascii);
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+ if (ret == ETH_ALEN)
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+ return mac;
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+ kfree(mac);
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+ return ERR_PTR(-EINVAL);
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+}
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+
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+static struct nvmem_cell_mac_address_property {
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+ char *name;
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+ void *(*read)(struct nvmem_cell *);
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+} nvmem_cell_mac_address_properties[] = {
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+ {
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+ .name = "mac-address",
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+ .read = nvmem_cell_get_mac_address,
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+ }, {
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+ .name = "mac-address-ascii",
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+ .read = nvmem_cell_get_mac_address_ascii,
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+ },
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+};
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+
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/**
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* Obtain the MAC address from an nvmem cell named 'mac-address' associated
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* with given device.
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@@ -550,21 +607,28 @@ EXPORT_SYMBOL(eth_platform_get_mac_addre
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*/
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int nvmem_get_mac_address(struct device *dev, void *addrbuf)
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{
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+ struct nvmem_cell_mac_address_property *property;
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struct nvmem_cell *cell;
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const void *mac;
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- size_t len;
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+ int i;
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+
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+ for (i = 0; i < ARRAY_SIZE(nvmem_cell_mac_address_properties); i++) {
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+ property = &nvmem_cell_mac_address_properties[i];
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+ cell = nvmem_cell_get(dev, property->name);
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+ /* For -EPROBE_DEFER don't try other properties. We'll get back to this one. */
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+ if (!IS_ERR(cell) || PTR_ERR(cell) == -EPROBE_DEFER)
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+ break;
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+ }
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- cell = nvmem_cell_get(dev, "mac-address");
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if (IS_ERR(cell))
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return PTR_ERR(cell);
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- mac = nvmem_cell_read(cell, &len);
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+ mac = property->read(cell);
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nvmem_cell_put(cell);
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-
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if (IS_ERR(mac))
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return PTR_ERR(mac);
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- if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
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+ if (!is_valid_ether_addr(mac)) {
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kfree(mac);
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return -EINVAL;
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}
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