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| author | Alan Stern <stern@rowland.harvard.edu> | 2014-06-30 11:04:21 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-30 22:47:18 -0700 |
| commit | b14bf2d0c0358140041d1c1805a674376964d0e0 (patch) | |
| tree | 7548f59221b4f29f59f056ae717ede2732baf3cb /drivers/scsi/sd.c | |
| parent | ba1ba3a4ed0c5c6a6121169abe61802aeab6c1d2 (diff) | |
| download | lwn-b14bf2d0c0358140041d1c1805a674376964d0e0.tar.gz lwn-b14bf2d0c0358140041d1c1805a674376964d0e0.zip | |
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.c | 5 |
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; |