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Hans de Goede e449f26bed ehci_free_packet: Discard finished packets when the queue is halted 
With pipelining it is possible to encounter a finished packet when cleaning
the queue due to a halt. This happens when a non stall error happens while
talking to a real device. In this case the queue on the usb-host side will
continue processing packets, and we can have completed packets waiting in
the queue after an error condition packet causing a halt.

There are 2 reasons to discard the completed packets at this point, rather
then trying to writing them back to the guest:

1) The guest expect to be able to cancel and/or change packets after the
packet with the error without doing an unlink, so writing them back may
confuse the guest.

2) Since the queue does not advance when halted, the writing back of these
packets will fail anyways since p->qtdaddr != q->qtdaddr, so the
ehci_verify_qtd call in ehci_writeback_async_complete_packet will fail.

Note that 2) means that then only functional change this patch introduces
is the printing of a warning when this scenario happens.

Note that discarding these packets means that the guest driver and the device
will get out of sync! This is unfortunate, but should not be a problem since
with a non stall error (iow an io-error) the 2 are out of sync already anyways.
Still this patch adds a warning to signal this happening.

Note that sofar this has only been seen with a DVB-T receiver, which gives
of a MPEG-2 stream, which allows for recovering from lost packets, see:
https://bugzilla.redhat.com/show_bug.cgi?id=890320

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-04-23 08:43:10 +02:00
audio audio: Replace non-portable asprintf in debug code by g_strdup_printf 2013-01-16 12:03:26 -06:00
backends rng random backend: check for -EAGAIN errors on read 2013-04-16 16:10:21 -05:00
block Merge remote-tracking branch 'kwolf/for-anthony' into staging 2013-04-22 08:08:22 -05:00
bsd-user qemu-log: default to stderr for logging output 2013-02-26 13:31:47 -06:00
default-configs Merge remote-tracking branch 'bonzini/scsi-next' into staging 2013-04-22 08:05:05 -05:00
disas target-i386: add AES-NI instructions 2013-04-13 13:51:57 +02:00
docs Merge remote-tracking branch 'bonzini/scsi-next' into staging 2013-04-22 08:05:05 -05:00
dtc@bc895d6d09 dtc: add submodule 2013-04-18 13:50:53 +02:00
fpu fpu: Correct edgecase in float64_muladd 2013-04-15 16:06:15 +02:00
fsdev virtfs-proxy-helper: Fix unchecked strdup() by conv. to g_strdup() 2013-01-30 11:14:46 +01:00
gdb-xml
hw ehci_free_packet: Discard finished packets when the queue is halted 2013-04-23 08:43:10 +02:00
include Add option to mlock qemu and guest memory 2013-04-22 08:52:23 -05:00
ldscripts build: create ldscripts/ 2012-12-19 08:29:06 +01:00
libcacard libcacard: Fix unchecked strdup() by converting to g_strdup() 2013-01-30 11:14:46 +01:00
linux-headers linux-headers: Update to v3.9-rc2 2013-04-01 11:50:04 -06:00
linux-user linux-user: change do_semop to return target errno when unsuccessful 2013-04-19 11:42:03 +02:00
net sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
pc-bios hw: move headers to include/ 2013-04-08 18:13:10 +02:00
pixman@97336fad32 qapi: move include files to include/qobject/ 2012-12-19 08:31:31 +01:00
po po: Update German translation 2013-04-04 00:28:37 +02:00
qapi qapi: Fix unchecked strdup() by converting to g_strdup() 2013-01-30 11:14:46 +01:00
qga qemu-ga: ga_get_fd_handle(): abort if fd_counter overflows 2013-04-02 09:06:11 -05:00
QMP virtio,pci,qom 2013-03-26 16:16:43 -05:00
qobject qjson: to_json() case QTYPE_QSTRING is buggy, rewrite 2013-04-13 19:40:25 +00:00
qom qom: do nothing on unparent of object without parent 2013-04-16 16:10:21 -05:00
roms virtio,pci,qom 2013-03-26 16:16:43 -05:00
scripts vmxcap: Update according to SDM of January 2013 2013-04-17 23:27:24 -03:00
slirp sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
stubs stubs: Add a vmstate_dummy struct for CONFIG_USER_ONLY 2013-03-12 10:35:54 +01:00
sysconfigs/target Eliminate cpus-x86_64.conf file 2012-09-21 15:12:58 +02:00
target-alpha cpu: Replace do_interrupt() by CPUClass::do_interrupt method 2013-03-12 10:35:55 +01:00
target-arm target-arm: Correctly restore FPSCR 2013-04-19 12:24:19 +01:00
target-cris target-cris: Override do_interrupt for pre-v32 CPU cores 2013-04-16 02:45:11 +02:00
target-i386 i386 ROR r8/r16 instruction fix 2013-04-20 21:27:52 +02:00
target-lm32 hw: move headers to include/ 2013-04-08 18:13:10 +02:00
target-m68k cpu: Replace do_interrupt() by CPUClass::do_interrupt method 2013-03-12 10:35:55 +01:00
target-microblaze Typo, spelling and grammatical fixes 2013-04-12 14:33:20 +02:00
target-mips target-mips: fix mipsdsp_mul_q15_q15 and tests for MAQ_SA_W_PHL/PHR 2013-04-15 16:07:57 +02:00
target-moxie target-moxie: Fix VMState registration 2013-04-12 14:30:39 +02:00
target-openrisc cpu: Replace do_interrupt() by CPUClass::do_interrupt method 2013-03-12 10:35:55 +01:00
target-ppc memory: move core typedefs to qemu/typedefs.h 2013-04-15 18:19:26 +02:00
target-s390x Typo, spelling and grammatical fixes 2013-04-12 14:33:20 +02:00
target-sh4 hw: move headers to include/ 2013-04-08 18:13:10 +02:00
target-sparc cpu: Replace do_interrupt() by CPUClass::do_interrupt method 2013-03-12 10:35:55 +01:00
target-unicore32 cpu: Replace do_interrupt() by CPUClass::do_interrupt method 2013-03-12 10:35:55 +01:00
target-xtensa cpu: Replace do_interrupt() by CPUClass::do_interrupt method 2013-03-12 10:35:55 +01:00
tcg tcg-ppc64: Handle deposit of zero 2013-04-15 20:09:55 +02:00
tests qemu-iotests: add 053 unaligned compressed image size test 2013-04-22 11:37:12 +02:00
trace trace: rebuild generated-events.o when configuration changes 2013-03-28 14:19:57 +01:00
ui Merge remote-tracking branch 'luiz/queue/qmp' into staging 2013-04-22 08:04:21 -05:00
util iov: handle partial writes from sendmsg and recvmsg 2013-04-17 11:43:45 +02:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gitignore .gitignore: rename trace/generated-tracers.dtrace 2013-03-28 14:19:57 +01:00
.gitmodules dtc: add submodule 2013-04-18 13:50:53 +02:00
.mailmap Add a .mailmap to map pre-git-conversion authors to friendly names 2011-12-12 17:06:21 -06:00
aio-posix.c aio: support G_IO_HUP and G_IO_ERR 2013-02-21 16:17:31 -06:00
aio-win32.c aio: Fix return value of aio_poll() 2013-01-17 10:51:42 +01:00
arch_init.c include: avoid useless includes of exec/ headers 2013-04-15 18:19:26 +02:00
async.c aio: add a ThreadPool instance to AioContext 2013-03-15 16:07:50 +01:00
balloon.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
block-migration.c migration: run setup callbacks out of big lock 2013-03-11 13:32:01 +01:00
block.c block: Fix build with tracing enabled 2013-04-22 11:31:41 -05:00
blockdev-nbd.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
blockdev.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
blockjob.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
bt-host.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
Changelog fix some common typos 2012-05-14 07:27:24 +02:00
cmd.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
cmd.h Delete useless 'extern' qualifiers for functions 2011-01-23 16:21:20 +00:00
CODING_STYLE Replace Qemu by QEMU in internal documentation 2012-04-07 13:58:25 +00:00
configure vhost-scsi: new device supporting the tcm_vhost Linux kernel module 2013-04-19 16:18:11 +02:00
COPYING
COPYING.LIB
coroutine-gthread.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
coroutine-sigaltstack.c Merge remote-tracking branch 'kwolf/for-anthony' into staging 2013-02-26 07:44:39 -06:00
coroutine-ucontext.c Fix warnings suppressors to honor --disable-werror 2013-04-17 10:28:04 -05:00
coroutine-win32.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
cpu-exec.c Merge branch 'mingw' of git://qemu.weilnetz.de/qemu 2013-04-13 14:31:54 +02:00
cpus.c w64: Fix compiler warnings (wrong format specifier) 2013-04-19 11:38:08 +02:00
cputlb.c cpu: Move current_tb field to CPUState 2013-02-16 14:51:00 +01:00
device-hotplug.c hw: move device-hotplug.o to toplevel, compile it once 2013-03-01 13:57:13 +01:00
device_tree.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
disas.c disas: Disassemble all ppc insns for the host 2013-04-15 19:44:35 +02:00
dma-helpers.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
dump-stub.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
dump.c include: avoid useless includes of exec/ headers 2013-04-15 18:19:26 +02:00
exec.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
gdbstub.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
HACKING HACKING: List areas where we may rely on impdef C behaviour 2012-12-08 14:27:40 +00:00
hmp-commands.hx Revert "New QMP command query-cpu-max and HMP command cpu_max" 2013-04-12 09:41:54 -04:00
hmp.c Merge remote-tracking branch 'bonzini/hw-dirs' into staging 2013-04-15 17:06:04 -05:00
hmp.h Revert "New QMP command query-cpu-max and HMP command cpu_max" 2013-04-12 09:41:54 -04:00
iohandler.c iohandler: switch to GPollFD 2013-02-21 16:17:31 -06:00
ioport.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
kvm-all.c pci: add pci test device 2013-04-19 08:38:05 -05:00
kvm-stub.c pci: add pci test device 2013-04-19 08:38:05 -05:00
LICENSE LICENSE: There is no libqemu.a anymore 2011-12-09 11:25:22 +00:00
main-loop.c main-loop: drop the BQL if the I/O appears to be spinning 2013-04-05 12:53:33 -05:00
MAINTAINERS MAINTAINERS: update for source code movement 2013-04-08 18:13:16 +02:00
Makefile configure/Make: Build libfdt from submodule DTC 2013-04-18 13:50:53 +02:00
Makefile.objs tpm: reorganize headers and split hardware part 2013-04-15 18:19:25 +02:00
Makefile.target configure: move common libraries to config-host.mak 2013-04-18 14:12:31 +02:00
memory.c memory: fix a bug of detection of memory region collision 2013-03-22 13:21:28 +01:00
memory_mapping-stub.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
memory_mapping.c exec: change RAM list to a TAILQ 2012-12-20 23:08:47 +01:00
migration-exec.c migration: eliminate s->migration_file 2013-03-11 13:32:03 +01:00
migration-fd.c migration: eliminate s->migration_file 2013-03-11 13:32:03 +01:00
migration-tcp.c migration: eliminate s->migration_file 2013-03-11 13:32:03 +01:00
migration-unix.c migration: eliminate s->migration_file 2013-03-11 13:32:03 +01:00
migration.c migration: reflect incoming failure to shell 2013-04-17 10:24:24 -05:00
monitor.c Merge remote-tracking branch 'bonzini/hw-dirs' into staging 2013-04-15 17:06:04 -05:00
nbd.c oslib-posix: rename socket_set_nonblock() to qemu_set_nonblock() 2013-04-02 11:47:37 -04:00
os-posix.c Add option to mlock qemu and guest memory 2013-04-22 08:52:23 -05:00
os-win32.c qemu-timer: move timeBeginPeriod/timeEndPeriod to os-win32 2013-04-12 18:27:16 +02:00
page_cache.c page_cache: dup memory on insert 2013-03-11 13:32:03 +01:00
qapi-schema-test.json qapi: add struct-errors test case to test-qmp-output-visitor 2012-03-27 09:11:00 -03:00
qapi-schema.json qapi: use valid JSON in schema 2013-04-12 09:41:54 -04:00
qdev-monitor.c qbus: remove wrong error messages 2013-04-17 10:24:11 -05:00
qdict-test-data.txt
qemu-bridge-helper.c qemu-bridge-helper: force usage of a very high MAC address for the bridge 2013-03-28 12:58:52 -05:00
qemu-char.c qemu-char: do not operate on sources from finalize callbacks 2013-04-22 08:52:21 -05:00
qemu-coroutine-io.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
qemu-coroutine-lock.c coroutine: use AioContext for CoQueue BH 2013-03-15 16:07:51 +01:00
qemu-coroutine-sleep.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
qemu-coroutine.c coroutine: move pooling to common code 2013-02-22 21:21:10 +01:00
qemu-doc.texi block: ssh: Use libssh2_sftp_fsync (if supported by libssh2) to flush to disk. 2013-04-15 10:18:05 +02:00
qemu-img-cmds.hx qemu-img: Add compare subcommand 2013-02-22 21:21:10 +01:00
qemu-img.c qemu-img: do not zero-pad the compressed write buffer 2013-04-22 10:27:58 +02:00
qemu-img.texi qemu-img: Add compare subcommand 2013-02-22 21:21:10 +01:00
qemu-io.c block: Add options QDict to bdrv_file_open() prototypes 2013-03-22 17:51:31 +01:00
qemu-log.c qemu-log: default to stderr for logging output 2013-02-26 13:31:47 -06:00
qemu-nbd.c Add -f FMT / --format FMT arg to qemu-nbd 2013-04-15 14:29:20 -05:00
qemu-nbd.texi Add -f FMT / --format FMT arg to qemu-nbd 2013-04-15 14:29:20 -05:00
qemu-options-wrapper.h vl.c: In qemu -h output, only print options for the arch we are running as 2011-12-19 10:27:33 -06:00
qemu-options.h vl.c: Move option generation logic into a wrapper file 2011-12-19 10:27:33 -06:00
qemu-options.hx Add option to mlock qemu and guest memory 2013-04-22 08:52:23 -05:00
qemu-seccomp.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
qemu-tech.texi qemu-tech.texi: update implemented xtensa features list 2012-11-29 13:00:52 -06:00
qemu-timer.c qemu-timer: move timeBeginPeriod/timeEndPeriod to os-win32 2013-04-12 18:27:16 +02:00
qemu.sasl
qmp-commands.hx Revert "New QMP command query-cpu-max and HMP command cpu_max" 2013-04-12 09:41:54 -04:00
qmp.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
qtest.c qtest: Handle addresses and values for {in, out}[bwl] as unsigned 2013-04-22 09:11:50 -05:00
readline.c readline: Fix unchecked strdup() by converting to g_strdup() 2013-01-30 11:14:46 +01:00
README Update README 2011-12-11 17:50:43 -06:00
rules.mak rules/mak: make clean should blow away timestamp files 2013-01-30 01:31:08 +02:00
savevm.c qemu-file: do not use stdio for qemu_fdopen 2013-04-17 11:44:22 +02:00
spice-qemu-char.c spice-qemu-char: vmc_write: Don't write more bytes then we're asked too 2013-04-16 11:52:09 +02:00
tcg-runtime.c tcg: Implement multiword multiply helpers 2013-02-23 17:25:28 +00:00
tci.c tci: Make tcg temporaries local to tcg_qemu_tb_exec 2013-04-11 19:58:21 +02:00
thread-pool.c threadpool: drop global thread pool 2013-03-15 16:07:51 +01:00
thunk.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
tpm.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
trace-events scsi: VMWare PVSCSI paravirtual device implementation 2013-04-19 10:44:17 +02:00
translate-all.c translate-all: fix compiler warning and linked error 2013-04-22 08:47:33 -05:00
translate-all.h cputlb: Pass CPUState to cpu_unlink_tb() 2013-02-16 14:51:00 +01:00
user-exec.c Replace all setjmp()/longjmp() with sigsetjmp()/siglongjmp() 2013-02-23 16:11:19 +00:00
VERSION Open up 1.5 development tree 2013-02-15 17:40:56 -06:00
version.rc
vl.c Add option to mlock qemu and guest memory 2013-04-22 08:52:23 -05:00
xbzrle.c Move XBZRLE encoding code to a separate file to allow testing 2013-02-01 08:32:20 +01:00
xen-all.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
xen-mapcache.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
xen-stub.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu.org

- QEMU team