Modify the pre_save method on VMStateDescription to return an int
rather than void so that it potentially can fail.
Changed zillions of devices to make them return 0; the only
case I've made it return non-0 is hw/intc/s390_flic_kvm.c that already
had an error_report/return case.
Note: If you add an error exit in your pre_save you must emit
an error_report to say why.
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20170925112917.21340-2-dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Add a return value to the event handler. Some I2C devices will
NAK if they have no data, so allow them to do this. This required
the following changes:
Go through all the event handlers and change them to return int
and return 0.
Modify i2c_start_transfer to terminate the transaction on a NAK.
Modify smbus handing to not assert if a NAK occurs on a second
operation, and terminate the transaction and return -1 instead.
Add some information on semantics to I2CSlaveClass.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Some SMBus operations restart the transfer to convert from
write to read mode without an intervening i2c_end_transfer().
The second call cannot fail, so the return code is unchecked,
but this causes Coverity to complain. So add some asserts
and documentation about this.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Change 2293c27fad (i2c: implement broadcast write) added broadcast
capability to the I2C bus, but it broke SMBus read transactions.
An SMBus read transaction does two i2c_start_transaction() calls
without an intervening i2c_end_transfer() call. This will
result in i2c_start_transfer() adding the same device to the
current_devs list twice, and then the ->event() for the same
device gets called twice in the second call to i2c_start_transfer(),
resulting in the smbus code getting confused.
Note that this happens even with pure I2C devices when simulating
SMBus over I2C.
This fix only scans the bus if the current set of devices is empty.
This means that the current set of devices stays fixed until
i2c_end_transfer() is called, which is really what you want.
This also deletes the empty check from the top of i2c_end_transfer().
It's unnecessary, and it prevents the broadcast variable from being
set to false at the end of the transaction if no devices were on
the bus.
Cc: KONRAD Frederic <fred.konrad@greensocs.com>
Cc: Alistair Francis <alistair.francis@xilinx.com>
Cc: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Cc: Kwon <hyun.kwon@xilinx.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: KONRAD Frederic <fred.konrad@greensocs.com>
Tested-by: KONRAD Frederic <fred.konrad@greensocs.com>
Message-id: 1470153614-6657-1-git-send-email-minyard@acm.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
QEMU fails migration with following error:
qemu-system-x86_64: Missing section footer for i2c_bus
qemu-system-x86_64: load of migration failed: Invalid argument
when migrating from:
qemu-system-x86_64-v2.6.0 -m 256M rhel72.img -M pc-i440fx-2.6
to
qemu-system-x86_64-v2.7.0-rc0 -m 256M rhel72.img -M pc-i440fx-2.6
Regression is added by commit 2293c27f (i2c: implement broadcast write)
Fix it by dropping 'broadcast' VMState introduced by 2293c27f and
reuse broadcast 0x00 address as broadcast flag in bus->saved_address.
Then if there were ongoing broadcast at migration time, set
bus->saved_address to it and at i2c_slave_post_load() time check
for it instead of transfering and using 'broadcast' VMState.
As result of reusing existing saved_address VMState, no compat
glue will be needed to keep forward/backward compatiblity. which
makes fix much less intrusive.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1469623198-177227-1-git-send-email-imammedo@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
After previous Peter patch, they are redundant. This way we don't
assign them except when needed. Once there, there were lots of case
where the ".fields" indentation was wrong:
.fields = (VMStateField []) {
and
.fields = (VMStateField []) {
Change all the combinations to:
.fields = (VMStateField[]){
The biggest problem (appart from aesthetics) was that checkpatch complained
when we copy&pasted the code from one place to another.
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
