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scsi: introduce a quirk for false cache reporting

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Some SATA to USB bridges fail to cooperate with some
drives resulting in no cache being present being reported
to the host. That causes the host to skip sending
a command to synchronize caches. That causes data loss
when the drive is powered down.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2016-09-12 15:19:41 +02:00 committed by Greg Kroah-Hartman
parent 6406c3d226
commit 050bc4e846
5 changed files with 24 additions and 1 deletions
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2
Documentation/kernel-parameters.txt
View File

@ -4238,6 +4238,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
u = IGNORE_UAS (don't bind to the uas driver);
w = NO_WP_DETECT (don't test whether the
medium is write-protected).
y = ALWAYS_SYNC (issue a SYNCHRONIZE_CACHE
even if the device claims no cache)
Example: quirks=0419:aaf5:rl,0421:0433:rc
user_debug= [KNL,ARM]

8
drivers/usb/storage/scsiglue.c
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@ -296,6 +296,14 @@ static int slave_configure(struct scsi_device *sdev)
if (us->fflags & US_FL_BROKEN_FUA)
sdev->broken_fua = 1;
/* Some even totally fail to indicate a cache */
if (us->fflags & US_FL_ALWAYS_SYNC) {
/* don't read caching information */
sdev->skip_ms_page_8 = 1;
sdev->skip_ms_page_3f = 1;
/* assume sync is needed */
sdev->wce_default_on = 1;
}
} else {
/*

7
drivers/usb/storage/unusual_devs.h
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@ -338,6 +338,13 @@ UNUSUAL_DEV( 0x046b, 0xff40, 0x0100, 0x0100,
USB_SC_DEVICE, USB_PR_DEVICE, NULL,
US_FL_NO_WP_DETECT),
/* Reported by Egbert Eich <eich@suse.com> */
UNUSUAL_DEV( 0x0480, 0xd010, 0x0100, 0x9999,
"Toshiba",
"External USB 3.0",
USB_SC_DEVICE, USB_PR_DEVICE, NULL,
US_FL_ALWAYS_SYNC),
/* Patch submitted by Philipp Friedrich <philipp@void.at> */
UNUSUAL_DEV( 0x0482, 0x0100, 0x0100, 0x0100,
"Kyocera",

6
drivers/usb/storage/usb.c
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@ -498,7 +498,8 @@ void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags)
US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 |
US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE |
US_FL_NO_ATA_1X | US_FL_NO_REPORT_OPCODES |
US_FL_MAX_SECTORS_240 | US_FL_NO_REPORT_LUNS);
US_FL_MAX_SECTORS_240 | US_FL_NO_REPORT_LUNS |
US_FL_ALWAYS_SYNC);
p = quirks;
while (*p) {
@ -581,6 +582,9 @@ void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags)
case 'w':
f |= US_FL_NO_WP_DETECT;
break;
case 'y':
f |= US_FL_ALWAYS_SYNC;
break;
/* Ignore unrecognized flag characters */
}
}

2
include/linux/usb_usual.h
View File

@ -81,6 +81,8 @@
/* Sets max_sectors to 240 */ \
US_FLAG(NO_REPORT_LUNS, 0x10000000) \
/* Cannot handle REPORT_LUNS */ \
US_FLAG(ALWAYS_SYNC, 0x20000000) \
/* lies about caching, so always sync */ \
#define US_FLAG(name, value) US_FL_##name = value ,
enum { US_DO_ALL_FLAGS };