am 08befc3a: Merge "ueventd: support by-name symlinks for PCI block devices"
* commit '08befc3a8066626bb7336dd9ad656e737712153e':
ueventd: support by-name symlinks for PCI block devices
diff --git a/init/devices.c b/init/devices.c
index 5d7ad3b..3119e8e 100644
--- a/init/devices.c
+++ b/init/devices.c
@@ -298,6 +298,37 @@
}
}
+/* Given a path that may start with a PCI device, populate the supplied buffer
+ * with the PCI domain/bus number and the peripheral ID and return 0.
+ * If it doesn't start with a PCI device, or there is some error, return -1 */
+static int find_pci_device_prefix(const char *path, char *buf, ssize_t buf_sz)
+{
+ const char *start, *end;
+
+ if (strncmp(path, "/devices/pci", 12))
+ return -1;
+
+ /* Beginning of the prefix is the initial "pci" after "/devices/" */
+ start = path + 9;
+
+ /* End of the prefix is two path '/' later, capturing the domain/bus number
+ * and the peripheral ID. Example: pci0000:00/0000:00:1f.2 */
+ end = strchr(start, '/');
+ if (!end)
+ return -1;
+ end = strchr(end + 1, '/');
+ if (!end)
+ return -1;
+
+ /* Make sure we have enough room for the string plus null terminator */
+ if (end - start + 1 > buf_sz)
+ return -1;
+
+ strncpy(buf, start, end - start);
+ buf[end - start] = '\0';
+ return 0;
+}
+
#if LOG_UEVENTS
static inline suseconds_t get_usecs(void)
@@ -422,11 +453,12 @@
return NULL;
}
-static char **parse_platform_block_device(struct uevent *uevent)
+static char **get_block_device_symlinks(struct uevent *uevent)
{
const char *device;
struct platform_node *pdev;
char *slash;
+ const char *type;
int width;
char buf[256];
char link_path[256];
@@ -438,18 +470,24 @@
struct stat info;
pdev = find_platform_device(uevent->path);
- if (!pdev)
+ if (pdev) {
+ device = pdev->name;
+ type = "platform";
+ } else if (!find_pci_device_prefix(uevent->path, buf, sizeof(buf))) {
+ device = buf;
+ type = "pci";
+ } else {
return NULL;
- device = pdev->name;
+ }
char **links = malloc(sizeof(char *) * 4);
if (!links)
return NULL;
memset(links, 0, sizeof(char *) * 4);
- INFO("found platform device %s\n", device);
+ INFO("found %s device %s\n", type, device);
- snprintf(link_path, sizeof(link_path), "/dev/block/platform/%s", device);
+ snprintf(link_path, sizeof(link_path), "/dev/block/%s/%s", type, device);
if (uevent->partition_name) {
p = strdup(uevent->partition_name);
@@ -556,7 +594,7 @@
make_dir(base, 0755);
if (!strncmp(uevent->path, "/devices/", 9))
- links = parse_platform_block_device(uevent);
+ links = get_block_device_symlinks(uevent);
handle_device(uevent->action, devpath, uevent->path, 1,
uevent->major, uevent->minor, links);