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authorOliver Neukum <oneukum@suse.com>2016-09-12 15:19:41 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-13 08:08:24 +0200
commit050bc4e846af24e77af82d0fa5f718e0919d15a4 (patch)
tree9a670fd070e7d58478639602cb133509826329d2 /Documentation/kernel-parameters.txt
parent6406c3d226374c28d452b11db3b5ac241ce26191 (diff)
downloadlinux-aarch64-050bc4e846af24e77af82d0fa5f718e0919d15a4.tar.gz
scsi: introduce a quirk for false cache reporting
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>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index a4f4d693e2c1..edb7d5d9db83 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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]