On Thu, Sep 27, 2018 at 11:56:03AM +0300, Viktor Krasnov wrote: > From: Edgar Cherkasov <echerkasov@xxxxxxxxxxxxx> > > The i2c-scmi driver crashes when the SMBus Write Block transaction is > executed: > > WARNING: CPU: 9 PID: 2194 at mm/page_alloc.c:3931 __alloc_pages_slowpath+0x9db/0xec0 > Call Trace: > ? get_page_from_freelist+0x49d/0x11f0 > ? alloc_pages_current+0x6a/0xe0 > ? new_slab+0x499/0x690 > __alloc_pages_nodemask+0x265/0x280 > alloc_pages_current+0x6a/0xe0 > kmalloc_order+0x18/0x40 > kmalloc_order_trace+0x24/0xb0 > ? acpi_ut_allocate_object_desc_dbg+0x62/0x10c > __kmalloc+0x203/0x220 > acpi_os_allocate_zeroed+0x34/0x36 > acpi_ut_copy_eobject_to_iobject+0x266/0x31e > acpi_evaluate_object+0x166/0x3b2 > acpi_smbus_cmi_access+0x144/0x530 [i2c_scmi] > i2c_smbus_xfer+0xda/0x370 > i2cdev_ioctl_smbus+0x1bd/0x270 > i2cdev_ioctl+0xaa/0x250 > do_vfs_ioctl+0xa4/0x600 > SyS_ioctl+0x79/0x90 > do_syscall_64+0x73/0x130 > entry_SYSCALL_64_after_hwframe+0x3d/0xa2 > ACPI Error: Evaluating _SBW: 4 (20170831/smbus_cmi-185) > > This problem occurs because the length of ACPI Buffer object is not > defined/initialized in the code before a corresponding ACPI method is > called. The obvious patch below fixes this issue. > > Signed-off-by: Edgar Cherkasov <echerkasov@xxxxxxxxxxxxx> > Acked-by: Viktor Krasnov <vkrasnov@xxxxxxxxxxxxx> > Acked-by: Michael Brunner <Michael.Brunner@xxxxxxxxxxx> Applied to for-current, thanks!
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