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Alan Stern 91b95a82a5 usb-storage: Add quirk to defeat Kindle's automatic unload 
commit 546aa0e4ea6ed81b6c51baeebc4364542fa3f3a7 upstream.

Matthias reports that the Amazon Kindle automatically removes its
emulated media if it doesn't receive another SCSI command within about
one second after a SYNCHRONIZE CACHE.  It does so even when the host
has sent a PREVENT MEDIUM REMOVAL command.  The reason for this
behavior isn't clear, although it's not hard to make some guesses.

At any rate, the results can be unexpected for anyone who tries to
access the Kindle in an unusual fashion, and in theory they can lead
to data loss (for example, if one file is closed and synchronized
while other files are still in the middle of being written).

To avoid such problems, this patch creates a new usb-storage quirks
flag telling the driver always to issue a REQUEST SENSE following a
SYNCHRONIZE CACHE command, and adds an unusual_devs entry for the
Kindle with the flag set.  This is sufficient to prevent the Kindle
from doing its automatic unload, without interfering with proper
operation.

Another possible way to deal with this would be to increase the
frequency of TEST UNIT READY polling that the kernel normally carries
out for removable-media storage devices.  However that would increase
the overall load on the system and it is not as reliable, because the
user can override the polling interval.  Changing the driver's
behavior is safer and has minimal overhead.

CC: <stable@vger.kernel.org>
Reported-and-tested-by: Matthias Schwarzott <zzam@gentoo.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20210317190654.GA497856@rowland.harvard.edu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-04-12 12:53:18 +08:00
Documentation KVM: arm64: Reject VM creation when the default IPA size is unsupported 2021-04-12 12:53:12 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch riscv: Correct SPARSEMEM configuration 2021-04-12 12:53:18 +08:00
block blk-settings: align max_sectors on "logical_block_size" boundary 2021-04-12 12:52:32 +08:00
certs certs: Fix blacklist flag type confusion 2021-04-12 12:52:25 +08:00
crypto crypto: x86 - Regularize glue function prototypes 2021-04-12 12:53:14 +08:00
drivers usb-storage: Add quirk to defeat Kindle's automatic unload 2021-04-12 12:53:18 +08:00
fs nfsd: Don't keep looking up unhashed files in the nfsd file cache 2021-04-12 12:53:17 +08:00
include usb-storage: Add quirk to defeat Kindle's automatic unload 2021-04-12 12:53:18 +08:00
init fgraph: Initialize tracing_graph_pause at task creation 2021-04-12 12:51:55 +08:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2021-03-16 16:27:51 +08:00
kernel bpf: Add sanity check for upper ptr_limit 2021-04-12 12:53:13 +08:00
lib PCI: Fix pci_register_io_range() memory leak 2021-04-12 12:53:04 +08:00
mm Revert "mm, slub: consider rest of partial list if acquire_slab() fails" 2021-04-12 12:52:58 +08:00
net net/qrtr: fix __netdev_alloc_skb call 2021-04-12 12:53:17 +08:00
package generate-rpms: modify the name of the kernel tag for x86 and arm64 2021-04-07 06:53:59 +00:00
samples samples, bpf: Add missing munmap in xdpsock 2021-04-12 12:52:57 +08:00
scripts ftrace: Have recordmcount use w8 to read relp->r_info in arm64_is_fake_mcount 2021-04-12 12:52:52 +08:00
security Revert 95ebabde382c ("capabilities: Don't allow writing ambiguous v3 file capabilities") 2021-04-12 12:53:05 +08:00
sound ASoC: simple-card-utils: Do not handle device clock 2021-04-12 12:53:16 +08:00
tools bpf, selftests: Fix up some test_verifier cases for unprivileged 2021-04-12 12:53:13 +08:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt KVM: arm64: Ensure I-cache isolation between vcpus of a same VM 2021-04-12 12:53:12 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitattributes Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
COPYING Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
CREDITS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
MAINTAINERS Documentation/llvm: add documentation on building w/ Clang/LLVM 2021-03-16 16:34:24 +08:00
Makefile kbuild: Fix <linux/version.h> for empty SUBLEVEL or PATCHLEVEL again 2021-04-12 12:53:18 +08:00
README Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

README.md

Tencent Linux Kernel 4.0