platform/x86/amd/pmc: Only expose stb_read after telemetry buffer is mapped

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amd_stb_s2d_init() creates the v2 "stb_read" debugfs node before mapping
the telemetry buffer into dev->stb_virt_addr, leaving a window during probe
where a read faults on a NULL dev->stb_virt_addr in
amd_stb_debugfs_open_v2()/amd_stb_handle_efr().

This becomes trivial to hit once a failed STB init no longer aborts probe
(next patch), which leaves the node registered with a NULL buffer.  Create
it only after dev->stb_virt_addr is mapped.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://patch.msgid.link/20260721181756.143084-5-mario.limonciello@amd.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

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Mario Limonciello 2026-07-21 13:17:54 -05:00 • committed by Ilpo Järvinen

parent 0225c1d637

commit 34d145254c

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1 changed files with 12 additions and 5 deletions

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drivers/platform/x86/amd/pmc/mp1_stb.c

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