Commit b14bf2d0 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
Browse files

usb-storage/SCSI: Add broken_fua blacklist flag 



Some buggy JMicron USB-ATA bridges don't know how to translate the FUA
bit in READs or WRITEs.  This patch adds an entry in unusual_devs.h
and a blacklist flag to tell the sd driver not to use FUA.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Reported-by: default avatarMichael Büsch <m@bues.ch>
Tested-by: default avatarMichael Büsch <m@bues.ch>
Acked-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
CC: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
CC: <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ba1ba3a4

drivers/scsi/sd.c

+4 −1
Original line number Diff line number Diff line
@@ -2441,7 +2441,10 @@ sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 
		}



		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;

drivers/usb/storage/scsiglue.c

+4 −0
Original line number Diff line number Diff line
@@ -256,6 +256,10 @@ static int slave_configure(struct scsi_device *sdev) 
		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

drivers/usb/storage/unusual_devs.h

+7 −0
Original line number Diff line number Diff line
@@ -1936,6 +1936,13 @@ UNUSUAL_DEV( 0x14cd, 0x6600, 0x0201, 0x0201, 
		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 <oliva@lsd.ic.unicamp.br>

 * JMicron responds to USN and several other SCSI ioctls with a

 * residue that causes subsequent I/O requests to fail.  */

include/linux/usb_usual.h

+3 −1
Original line number Diff line number Diff line
@@ -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 or READ CDBs */	\



#define US_FLAG(name, value)	US_FL_##name = value ,

enum { US_DO_ALL_FLAGS };

include/scsi/scsi_device.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

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