usb: typec: ucsi: Limit read size on v1.2

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[ Upstream commit b3db266fb0 ]

Between UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was
increased from 16 to 256. In order to avoid overflowing reads for older
systems, add a mechanism to use the read UCSI version to truncate read
sizes on UCSI v1.2.

Tested-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Link: https://lore.kernel.org/r/20240209143723.v5.1.Iacf5570a66b82b73ef03daa6557e2fc0db10266a@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Abhishek Pandit-Subedi 2024-02-09 14:37:30 -08:00 • committed by Greg Kroah-Hartman

parent 0d52e1853b

commit 266f403ec4

2 changed files with 35 additions and 2 deletions

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26

drivers/usb/typec/ucsi/ucsi.c

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11

drivers/usb/typec/ucsi/ucsi.h

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