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50c4e96411
linux/drivers
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Alan Stern 50c4e96411 scsi: don't store LUN bits in CDB[1] for USB mass-storage devices 
The SCSI specification requires that the second Command Data Byte
should contain the LUN value in its high-order bits if the recipient
device reports SCSI level 2 or below.  Nevertheless, some USB
mass-storage devices use those bits for other purposes in
vendor-specific commands.  Currently Linux has no way to send such
commands, because the SCSI stack always overwrites the LUN bits.

Testing shows that Windows 7 and XP do not store the LUN bits in the
CDB when sending commands to a USB device.  This doesn't matter if the
device uses the Bulk-Only or UAS transports (which virtually all
modern USB mass-storage devices do), as these have a separate
mechanism for sending the LUN value.

Therefore this patch introduces a flag in the Scsi_Host structure to
inform the SCSI midlayer that a transport does not require the LUN
bits to be stored in the CDB, and it makes usb-storage set this flag
for all devices using the Bulk-Only transport.  (UAS is handled by a
separate driver, but it doesn't really matter because no SCSI-2 or
lower device is at all likely to use UAS.)

The patch also cleans up the code responsible for storing the LUN
value by adding a bitflag to the scsi_device structure.  The test for
whether to stick the LUN value in the CDB can be made when the device
is probed, and stored for future use rather than being made over and
over in the fast path.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Tiziano Bacocco <tiziano.bacocco@gmail.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2014-09-15 16:01:58 -07:00
..
accessibility
acpi Merge branches 'acpi-rtc', 'acpi-lpss' and 'acpi-battery' 2014-09-11 15:09:30 +02:00
amba
ata ahci_xgene: Fix the link down in first attempt for the APM X-Gene SoC AHCI SATA host controller driver. 2014-09-06 11:27:15 +09:00
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-08-13 18:27:40 -06:00
auxdisplay
base Merge remote-tracking branches 'regmap/fix/cache', 'regmap/fix/debugfs' and 'regmap/fix/volatile' into regmap-linus 2014-08-31 13:23:45 +01:00
bcma bcma: add PCI ID for spromless BCM43217 2014-08-25 15:39:23 -04:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2014-09-13 09:39:55 -07:00
bluetooth Bluetooth: Fix crash in the Marvell driver initialization codepath 2014-07-31 01:07:28 +02:00
bus bus: arm-ccn: Move event cleanup routine 2014-09-05 13:25:01 -07:00
cdrom
char virtio: rng: add derating factor for use by hwrng core 2014-08-15 10:26:01 +05:30
clk ARM: SoC platform changes for 3.17 2014-08-08 11:14:29 -07:00
clocksource ARM: SoC platform changes for 3.17 2014-08-08 11:14:29 -07:00
connector
cpufreq cpufreq / OPP: Fix the order of arguments for kcalloc() 2014-09-08 00:02:58 +02:00
cpuidle ARM: 8130/1: cpuidle/cpuidle-big_little: fix reading cpu id part number 2014-08-27 15:40:45 +01:00
crypto PCI changes for the v3.17 merge window (part 2): 2014-08-14 18:10:33 -06:00
dca
devfreq
dio
dma dmaengine: jz4740: Fix non-cyclic descriptor completion 2014-09-11 10:54:25 +05:30
dma-buf dma-buf/fence: Fix a kerneldoc warning 2014-08-28 11:59:09 +05:30
edac Merge branch 'linux_next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-edac 2014-08-15 17:56:45 -06:00
eisa
extcon
firewire Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-08-06 09:38:14 -07:00
firmware firmware: Do not use WARN_ON(!spin_is_locked()) 2014-08-22 08:45:40 +01:00
fmc
gpio gpio: bt8xx: fix release of managed resources 2014-08-29 14:31:43 +02:00
gpu drm/ast: AST2000 cannot be detected correctly 2014-09-12 13:41:39 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2014-08-27 09:38:06 -07:00
hsi HSI changes for the v3.17 series 2014-08-06 20:06:14 -07:00
hv Char / Misc driver patches for 3.17-rc1 2014-08-04 17:32:24 -07:00
hwmon hwmon: (ds1621) Update zbits after conversion rate change 2014-08-28 11:18:47 -07:00
hwspinlock hwspinlock: enable OMAP build for AM33xx, AM43xx & DRA7xx 2014-07-29 11:46:28 +03:00
i2c Revert "i2c: rcar: remove spinlock" 2014-09-04 19:59:42 +02:00
ide ide: use module_platform_driver() 2014-08-05 21:16:46 -07:00
idle intel_idle: Broadwell support 2014-08-15 17:06:40 -04:00
iio Staging driver patches for 3.17-rc1 2014-08-04 18:36:12 -07:00
infiniband mlx4: Set user-space raw Ethernet QPs to properly handle VXLAN traffic 2014-08-29 20:13:00 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2014-09-11 10:08:36 -07:00
iommu iommu/fsl: Fix warning resulting from adding PCI device twice 2014-09-05 16:01:46 +02:00
ipack
irqchip irqchip: gic-v3: Declare rdist as __percpu pointer to __iomem pointer 2014-09-03 12:08:10 +00:00
isdn drivers: isdn: eicon: xdi_msg.h: Fix typo in #ifndef 2014-08-22 11:31:30 -07:00
leds Revert "leds: convert blink timer to workqueue" 2014-09-02 10:02:13 -07:00
lguest mm/vmalloc.c: clean up map_vm_area third argument 2014-08-06 18:01:19 -07:00
macintosh == Changes to existing drivers == 2014-08-07 17:23:16 -07:00
mailbox mailbox/omap: add a parent structure for every IP instance 2014-07-29 01:57:25 -07:00
mcb
md dm cache: fix race causing dirty blocks to be marked as clean 2014-09-10 11:20:47 -04:00
media media: use pci_zalloc_consistent 2014-08-08 15:57:28 -07:00
memory memory: Freescale CoreNet Coherency Fabric error reporting driver 2014-07-29 19:26:30 -05:00
memstick
message
mfd mfd: twl4030-power: Fix PM idle pin configuration to not conflict with regulators 2014-08-28 15:57:55 +01:00
misc Lattice ECP3 FPGA: Check firmware pointer 2014-09-08 14:38:14 -07:00
mmc PCI changes for the v3.17 merge window (part 2): 2014-08-14 18:10:33 -06:00
mtd Two trivial MTD updates for 3.17-rc4: 2014-09-06 12:12:09 -07:00
net Merge tag 'master-2014-09-04' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless 2014-09-07 16:11:10 -07:00
nfc
ntb ntb: Add alignment check to meet hardware requirement 2014-09-14 00:10:38 -04:00
nubus
of of/irq: Fix lookup to use 'interrupts-extended' property first 2014-08-16 09:03:58 +01:00
oprofile
parisc parisc: dino: fix %d confusingly prefixed with 0x in format string 2014-08-27 14:35:04 +02:00
parport drivers/parport/parport_ip32.c: use PTR_ERR_OR_ZERO 2014-08-08 15:57:25 -07:00
pci PCI update for v3.17: 2014-09-03 08:45:48 -07:00
pcmcia Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2014-08-07 08:50:34 -07:00
phy phy: miphy365x: Select GENERIC_PHY instead of depending on it 2014-08-28 11:17:43 +05:30
pinctrl pinctrl: baytrail: resolve unbalanced IRQ wake disable warning 2014-09-10 14:25:51 +02:00
platform toshiba_acpi: fix and cleanup toshiba_kbd_bl_mode_store() 2014-09-03 10:45:12 -07:00
pnp ACPI / PNP: Fix acpi_pnp_match() 2014-07-30 00:23:09 +02:00
power ARM: SoC platform changes for 3.17 2014-08-08 11:14:29 -07:00
powercap powercap / RAPL: change domain detection message 2014-09-03 01:29:00 +02:00
pps
ps3
ptp PCI: Remove DEFINE_PCI_DEVICE_TABLE macro use 2014-08-12 12:15:14 -06:00
pwm pwm: Fix period and polarity in pwm_get() for non-perfect matches 2014-08-18 10:58:43 +02:00
rapidio PCI: Remove DEFINE_PCI_DEVICE_TABLE macro use 2014-08-12 12:15:14 -06:00
ras
regulator == Changes to existing drivers == 2014-08-07 17:17:39 -07:00
remoteproc
reset
rpmsg
rtc drivers/rtc/rtc-s5m.c: re-add support for devices without irq specified 2014-08-29 16:28:16 -07:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2014-09-08 08:27:00 -07:00
sbus Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc 2014-08-05 18:57:18 -07:00
scsi scsi: don't store LUN bits in CDB[1] for USB mass-storage devices 2014-09-15 16:01:58 -07:00
sfi
sh sh: intc: Confine SH_INTC to platforms that need it 2014-08-22 12:28:16 +09:00
sn
soc
spi Merge remote-tracking branch 'spi/fix/sh-msiof' into spi-linus 2014-08-31 13:46:19 +01:00
spmi
ssb ssb: add PCI ID 0x4351 2014-08-25 15:39:22 -04:00
staging Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-09-14 17:37:36 -07:00
target SCSI misc on 20140806 2014-08-06 20:10:32 -07:00
tc
thermal
thunderbolt thunderbolt: Clear hops before overwriting 2014-08-26 14:54:48 -07:00
tty tty: xuartps: Fix tx_emtpy() callback 2014-09-08 16:33:56 -07:00
uio
usb scsi: don't store LUN bits in CDB[1] for USB mass-storage devices 2014-09-15 16:01:58 -07:00
uwb uwb: init beacon cache entry before registering uwb device 2014-09-08 16:03:21 -07:00
vfio drivers/vfio: Enable VFIO if EEH is not supported 2014-08-08 10:39:16 -06:00
vhost
video video: ARM CLCD: Fix color model capabilities for DT platforms 2014-09-12 11:45:10 +03:00
virt
virtio virtio: Replace DEFINE_PCI_DEVICE_TABLE macro use 2014-07-27 21:07:15 +09:30
vlynq
vme vme: bridges: use pci_zalloc_consistent 2014-08-08 15:57:30 -07:00
w1
watchdog Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-08-07 08:47:00 -07:00
xen xen: bug fixes for 3.17-rc4 2014-09-11 16:52:29 -07:00
zorro
Kconfig Char / Misc driver patches for 3.17-rc1 2014-08-04 17:32:24 -07:00
Makefile Driver core patches for 3.17-rc1 2014-08-04 18:34:04 -07:00