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Input: ipaq-micro-keys - fix potential deadlock

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The driver acquires the micro->lock spinlock in process context (in
micro_key_start() and micro_key_stop()) without disabling interrupts.
However, this lock is also acquired in hardirq context by the MFD core
rx handler (micro_rx_msg()) which is called from the serial ISR.

This can lead to a lock inversion deadlock if the interrupt fires on the
same CPU while the process context holds the lock.

Fix this by using guard(spinlock_irq) instead of guard(spinlock) in
micro_key_start() and micro_key_stop() to disable interrupts while
holding the lock.

Reported-by: sashiko-bot@kernel.org
Assisted-by: Antigravity:gemini-3.5-flash
Link: https://patch.msgid.link/aij-pfaKK-Nna7wf@google.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2026-06-09 23:05:42 -07:00
parent 6251f7d347
commit ed0428e928
1 changed files with 2 additions and 2 deletions
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4
drivers/input/keyboard/ipaq-micro-keys.c
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@ -54,7 +54,7 @@ static void micro_key_receive(void *data, int len, unsigned char *msg)
static void micro_key_start(struct ipaq_micro_keys *keys)
{
guard(spinlock)(&keys->micro->lock);
guard(spinlock_irq)(&keys->micro->lock);
keys->micro->key = micro_key_receive;
keys->micro->key_data = keys;
@ -62,7 +62,7 @@ static void micro_key_start(struct ipaq_micro_keys *keys)
static void micro_key_stop(struct ipaq_micro_keys *keys)
{
guard(spinlock)(&keys->micro->lock);
guard(spinlock_irq)(&keys->micro->lock);
keys->micro->key = NULL;
keys->micro->key_data = NULL;