On Fri, 27 Jun 2014, Michael Büsch wrote:
> On Fri, 27 Jun 2014 14:42:01 -0400 (EDT)
> Alan Stern <st...@rowland.harvard.edu> wrote:
>
> > Michael, can you post the "lsusb -v" output for this device? I see it
> > is made by JMicron; they are notorious for buggy USB-ATA bridges.
>
> Of course. Here you go:
>
> Bus 004 Device 009: ID 152d:0567 JMicron Technology Corp. / JMicron USA
> Technology Corp.
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 3.00
> bDeviceClass 0 (Defined at Interface level)
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 9
> idVendor 0x152d JMicron Technology Corp. / JMicron USA Technology
> Corp.
> idProduct 0x0567
> bcdDevice 1.14
> iManufacturer 1 JMicron
> iProduct 2 USB to ATA/ATAPI Bridge
> iSerial 3 xxx
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 121
> bNumInterfaces 1
> bConfigurationValue 1
> iConfiguration 4 USB Mass Storage
> bmAttributes 0xc0
> Self Powered
> MaxPower 2mA
...
> MaxPower=2mA is a nice guess for a hard disk. ;)
That refers to the amount of power the device draws from the USB bus.
Since the disk drive is self-powered, it doesn't use much bus power.
Does the patch below do what you and James want?
Alan Stern
Index: usb-3.16/include/linux/usb_usual.h
===================================================================
--- usb-3.16.orig/include/linux/usb_usual.h
+++ usb-3.16/include/linux/usb_usual.h
@@ -70,7 +70,9 @@
US_FLAG(NEEDS_CAP16, 0x00400000) \
/* cannot handle READ_CAPACITY_10 */ \
US_FLAG(IGNORE_UAS, 0x00800000) \
- /* Device advertises UAS but it is broken */
+ /* Device advertises UAS but it is broken */ \
+ US_FLAG(BROKEN_FUA, 0x01000000) \
+ /* Cannot handle FUA in WRITE CDBs */ \
#define US_FLAG(name, value) US_FL_##name = value ,
enum { US_DO_ALL_FLAGS };
Index: usb-3.16/include/scsi/scsi_device.h
===================================================================
--- usb-3.16.orig/include/scsi/scsi_device.h
+++ usb-3.16/include/scsi/scsi_device.h
@@ -173,6 +173,7 @@ struct scsi_device {
unsigned is_visible:1; /* is the device visible in sysfs */
unsigned wce_default_on:1; /* Cache is ON by default */
unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
+ unsigned broken_fua:1; /* Don't set FUA bit */
atomic_t disk_events_disable_depth; /* disable depth for disk events */
Index: usb-3.16/drivers/usb/storage/unusual_devs.h
===================================================================
--- usb-3.16.orig/drivers/usb/storage/unusual_devs.h
+++ usb-3.16/drivers/usb/storage/unusual_devs.h
@@ -1936,6 +1936,13 @@ UNUSUAL_DEV( 0x14cd, 0x6600, 0x0201, 0x
USB_SC_DEVICE, USB_PR_DEVICE, NULL,
US_FL_IGNORE_RESIDUE ),
+/* Reported by Michael Büsch <m...@bues.ch> */
+UNUSUAL_DEV( 0x152d, 0x0567, 0x0114, 0x0114,
+ "JMicron",
+ "USB to ATA/ATAPI Bridge",
+ USB_SC_DEVICE, USB_PR_DEVICE, NULL,
+ US_FL_BROKEN_FUA ),
+
/* Reported by Alexandre Oliva <ol...@lsd.ic.unicamp.br>
* JMicron responds to USN and several other SCSI ioctls with a
* residue that causes subsequent I/O requests to fail. */
Index: usb-3.16/drivers/usb/storage/scsiglue.c
===================================================================
--- usb-3.16.orig/drivers/usb/storage/scsiglue.c
+++ usb-3.16/drivers/usb/storage/scsiglue.c
@@ -256,6 +256,10 @@ static int slave_configure(struct scsi_d
if (us->fflags & US_FL_WRITE_CACHE)
sdev->wce_default_on = 1;
+ /* A few buggy USB-ATA bridges don't understand FUA */
+ if (us->fflags & US_FL_BROKEN_FUA)
+ sdev->broken_fua = 1;
+
} else {
/* Non-disk-type devices don't need to blacklist any pages
Index: usb-3.16/drivers/scsi/sd.c
===================================================================
--- usb-3.16.orig/drivers/scsi/sd.c
+++ usb-3.16/drivers/scsi/sd.c
@@ -2441,7 +2441,10 @@ sd_read_cache_type(struct scsi_disk *sdk
}
sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
- if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
+ if (sdp->broken_fua) {
+ sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
+ sdkp->DPOFUA = 0;
+ } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
sd_first_printk(KERN_NOTICE, sdkp,
"Uses READ/WRITE(6), disabling FUA\n");
sdkp->DPOFUA = 0;
--
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