HID: intel-ish-hid: ignore post-init ENUM_DEVICES from firmware

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Some ISH firmware versions (observed on Tiger Lake LP, 8086:a0fc,
GUID {33AECD58-B679-4E54-9BD9-A04D34F0C226}) periodically re-send an
unsolicited HOSTIF_DM_ENUM_DEVICES response roughly every 79 seconds.

The current guard collapses two distinct cases into one condition:

  if (!(response_flag) || init_done)  ->  bad packet + ish_hw_reset

This incorrectly treats a valid post-init firmware announcement as a
corrupted packet, triggering an ISH soft-reset and a full ISHTP
re-initialisation cycle on each occurrence (~1100 times per day on
affected hardware).

Split the check: reject messages with no response flag as before, but
simply discard valid ENUM_DEVICES messages that arrive after init is
complete.

Signed-off-by: Wahid Khan <wahidzk0091@gmail.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Tested-by: Zhang Lixu <lixu.zhang@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

...

This commit is contained in:

Wahid Khan 2026-07-20 23:26:56 +05:30 • committed by Jiri Kosina

parent 4253fe22b1

commit f3f3f6df05

1 changed files with 3 additions and 2 deletions

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drivers/hid/intel-ish-hid/ishtp-hid-client.c

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