7f6674624e
Some kernel SAS drivers (e.g. smartpqi) expose ports with num_phys = 0. udev shouldn't treat these ports as wide ports. SAS wide ports always have num_phys > 1. See comments for sas_port_add_phy() in the kernel sources. Sample data from a smartpqi system to illustrate the issue below. Here the phy device is attached to port 0:0, which has no end devices attached and the SAS end device (where sda is attached) is associated with SAS port 0:1, which has no associated phy device. Thus num_phys for port-0:1 is 0. This is arguably wrong, but it's how smartpqi has always set up its devices in sysfs. /sys/class/sas_phy/phy-0:0 -> ../../devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/phy-0:0/sas_phy/phy-0:0 /sys/devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/port-0:0/phy-0:0 -> ../phy-0:0 /sys/devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/phy-0:0/port -> ../port-0:0 /sys/class/sas_device/end_device-0:1 -> ../../devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/port-0:1/end_device-0:1/sas_device/end_device-0:1 /sys/class/block/sda -> ../../devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/port-0:1/end_device-0:1/target0:0:0/0:0:0:0/block/sda Signed-off-by: Martin Wilck <mwilck@suse.com>
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