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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: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Michael Büsch <m@bues.ch>
Tested-by: Michael Büsch <m@bues.ch>
Acked-by: James Bottomley <James.Bottomley@HansenPartnership.com>
CC: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2014-06-30 11:04:21 -04:00 committed by Greg Kroah-Hartman
parent ba1ba3a4ed
commit b14bf2d0c0
5 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/scsi/sd.c
View File

@ -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;

4
drivers/usb/storage/scsiglue.c
View File

@ -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

7
drivers/usb/storage/unusual_devs.h
View File

@ -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. */

4
include/linux/usb_usual.h
View File

@ -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 };

1
include/scsi/scsi_device.h
View File

@ -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 */