github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-10-05 02:39:02 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

nfc: trf7970a: power down on startup RX gain failure

Browse Source 
trf7970a_startup() powers up the device before applying the optional RX
gain reduction. If the register read or write fails, it returns without
undoing that power-up. Probe's unwind only drops the separate regulator
references acquired by probe, leaving the additional VIN enable from
startup unbalanced. The system resume caller also has no power-down on
this error.

Call trf7970a_power_down() before returning the RX gain error to deassert
the enable GPIOs, release the startup VIN reference and restore the
powered-off state. Runtime PM has not been enabled yet, so the full
shutdown helper is not appropriate here. Preserve the original SPI error.

This issue was identified during our ongoing static-analysis research while
reviewing kernel code.

Fixes: 5d69351820 ("NFC: trf7970a: Create device-tree parameter for RX gain reduction")
Cc: stable@vger.kernel.org
Assisted-by: OpenAI:GPT-5.6
Co-developed-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
Reviewed-by: Paul Geurts <paul.geurts@prodrive-technologies.com>
Link: https://patch.msgid.link/20260913042625.31296-1-mhun512@gmail.com
Signed-off-by: David Heidelberg <david@ixit.cz>
This commit is contained in:
Myeonghun Pak 2026-09-13 00:26:25 -04:00 committed by David Heidelberg
parent 66f4300206
commit d2acbde7e6
No known key found for this signature in database
GPG Key ID: 60023FC4D3492072
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/nfc/trf7970a.c
View File

@ -1997,8 +1997,10 @@ static int trf7970a_startup(struct trf7970a *trf)
return ret;
ret = trf7970a_update_rx_gain_reduction(trf);
if (ret)
if (ret) {
trf7970a_power_down(trf);
return ret;
}
pm_runtime_set_active(trf->dev);
pm_runtime_enable(trf->dev);