libata: export ata_port port_no attribute via /sys
While registering host controller track port number based upon number
of ports available on the controller, export port_no attribute through
/sys. This patch is needed by udev for composing persistent links in
/dev/disk/by-path.
/sys/devices/pci0000:00/0000:00:1f.2/ata8/ata_port/ata8
total 0
lrwxrwxrwx. 1 root root 0 Mar 6 12:43 device -> ../../../ata8
-r--r--r--. 1 root root 4096 Mar 6 12:43 idle_irq
-r--r--r--. 1 root root 4096 Mar 6 12:43 nr_pmp_links
-r--r--r--. 1 root root 4096 Mar 6 12:43 port_no
drwxr-xr-x. 2 root root 0 Mar 6 12:42 power
lrwxrwxrwx. 1 root root 0 Mar 6 12:41 subsystem -> ../../../../../../class/ata_port
-rw-r--r--. 1 root root 4096 Mar 6 12:40 uevent
1
Signed-off-by: David Milburn <dmilburn@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 63c743b..5f7d5f9 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5636,6 +5636,7 @@
ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
ap->lock = &host->lock;
ap->print_id = -1;
+ ap->local_port_no = -1;
ap->host = host;
ap->dev = host->dev;
@@ -6126,9 +6127,10 @@
kfree(host->ports[i]);
/* give ports names and add SCSI hosts */
- for (i = 0; i < host->n_ports; i++)
+ for (i = 0; i < host->n_ports; i++) {
host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
-
+ host->ports[i]->local_port_no = i + 1;
+ }
/* Create associated sysfs transport objects */
for (i = 0; i < host->n_ports; i++) {