diff options
| author | Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> | 2026-10-19 17:39:21 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2026-11-02 14:24:15 +0000 |
| commit | 053c50a7052549aab0d310ad505947db3e211592 (patch) | |
| tree | 29116cf9b1483acebb9f047cdfa175c4630f11b1 /tools/lib/python | |
| parent | 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4 (diff) | |
regulator: qcom_spmi: don't take a sleeping lock in the SAW IPI
The SAW voltage change runs on CPU 0 from an IPI, but it reaches the SAW
registers through the syscon regmap, which is protected by a spinlock_t.
That is a sleeping lock on PREEMPT_RT, and lockdep complains as soon as
VDD_APCC actually changes voltage:
BUG: Invalid wait context
...
regmap_lock_spinlock+0x18/0x30
regmap_read+0x3c/0x78
spmi_saw_set_vdd+0x50/0x1ac
__flush_smp_call_function_queue+0x1ac/0x334
Map the SAW with a regmap of our own that uses a raw spinlock, and fail
the probe when that cannot be done instead of carrying an error pointer
around as the SAW regmap.
Fixes: 0caecaa87202 ("regulator: qcom_spmi: Add support for SAW")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://patch.msgid.link/20261019-fix-qcom-saw-v1-3-9c7ba3fc2493@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'tools/lib/python')
0 files changed, 0 insertions, 0 deletions