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authorAlan Stern <stern@rowland.harvard.edu>2014-06-30 11:04:21 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-30 22:47:18 -0700
commitb14bf2d0c0358140041d1c1805a674376964d0e0 (patch)
tree7548f59221b4f29f59f056ae717ede2732baf3cb /drivers/scsi/sd.c
parentba1ba3a4ed0c5c6a6121169abe61802aeab6c1d2 (diff)
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>
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e9689d57ccb6..6825eda1114a 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -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;