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linux/drivers/platform/surface
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Francesco Dolcini d849cf64c5 platform/surface: aggregator: fix recv_buf() return value 
commit c8820c92ca upstream.

Serdev recv_buf() callback is supposed to return the amount of bytes
consumed, therefore an int in between 0 and count.

Do not return negative number in case of issue, when
ssam_controller_receive_buf() returns ESHUTDOWN just returns 0, e.g. no
bytes consumed, this keep the exact same behavior as it was before.

This fixes a potential WARN in serdev-ttyport.c:ttyport_receive_buf().

Fixes: c167b9c7e3 ("platform/surface: Add Surface Aggregator subsystem")
Cc: stable@vger.kernel.org
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20231128194935.11350-1-francesco@dolcini.it
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-12-13 18:36:44 +01:00
..
aggregator platform/surface: aggregator: fix recv_buf() return value 2023-12-13 18:36:44 +01:00
Kconfig platform/surface: dtx: Add support for native SSAM devices 2021-03-17 18:39:38 +01:00
Makefile platform/surface: Add DTX driver 2021-03-17 18:39:38 +01:00
surface3-wmi.c platform/surface: surface3-wmi: Fix variable 'status' set but not used compiler warning 2021-02-04 13:23:55 +01:00
surface3_button.c platform/surface: Move Surface 3 Button driver to platform/surface 2020-10-27 12:51:24 +01:00
surface3_power.c surface: surface3_power: Fix battery readings on batteries without a serial number 2022-03-02 11:47:59 +01:00
surface_acpi_notify.c ACPI: scan: Extend acpi_walk_dep_device_list() 2021-06-07 16:45:05 +02:00
surface_aggregator_cdev.c platform/surface: aggregator_cdev: Add lockdep support 2021-06-16 17:47:53 +02:00
surface_aggregator_registry.c platform/surface: aggregator_registry: Add support for Surface Laptop Go 2 2022-09-20 12:39:43 +02:00
surface_dtx.c platform/surface: dtx: Add missing mutex_destroy() call in failure path 2021-06-16 17:47:52 +02:00
surface_gpe.c platform/surface: surface_gpe: Fix non-PM_SLEEP build warnings 2021-01-04 15:54:27 +01:00
surface_hotplug.c platform/surface: Add Surface Hot-Plug driver 2021-02-08 16:59:21 +01:00
surface_platform_profile.c platform/surface: platform_profile: Propagate error if profile registration fails 2023-10-25 11:59:03 +02:00
surfacepro3_button.c platform: x86: ACPI: Get rid of ACPICA message printing 2021-03-08 11:33:39 +01:00