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zpcictl: Read device link to obtain device address

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The address sysfs attribute might not be present on some older kernel
levels. Read the device link instead using readlink() to obtain the
address.

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Jan Höppner
2018-10-10 16:25:29 +02:00
parent 8f0496b26a
commit e2a8d85916
1 changed files with 18 additions and 9 deletions
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27
zpcictl/zpcictl.c
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@@ -172,13 +172,16 @@ static void sysfs_write_data(struct zpci_report_error *report, char *slot)
free(path);
}
/* lstat() doesn't work for sysfs files, so we have to work with a fixed size */
#define READLINK_SIZE 256
static void sysfs_get_slot_addr(const char *dev, char *slot)
{
char device[READLINK_SIZE], *result;
unsigned int major, minor;
struct stat dev_stat;
char addr[13];
ssize_t len;
char *path;
FILE *fp;
if (stat(dev, &dev_stat) != 0) {
errx(EXIT_FAILURE, "Could not get stat information for %s: %s",
@@ -187,15 +190,21 @@ static void sysfs_get_slot_addr(const char *dev, char *slot)
major = major(dev_stat.st_rdev);
minor = minor(dev_stat.st_rdev);
path = util_path_sysfs("dev/char/%u:%u/address", major, minor);
fp = fopen(path, "r");
if (!fp)
fopen_err(path);
fscanf(fp, "%s", addr);
fclose(fp);
path = util_path_sysfs("dev/char/%u:%u/device", major, minor);
len = readlink(path, device, READLINK_SIZE - 1);
free(path);
if (len != -1)
device[len] = '\0';
else
errx(EXIT_FAILURE, "Could not read device link for %s", dev);
strcpy(slot, addr);
result = strrchr(device, '/');
if (result)
result++;
else
result = device;
strcpy(slot, result);
}
static void get_device_node(struct zpci_device *pdev)