forked from luck/tmp_suning_uos_patched
3bcf02208e
commit fc3e62e25c3896855b7c3d72df19ca6be3459c9f upstream.
smp2p_update_bits() should disable interrupts when it acquires its
spinlock. This is important because without the _irqsave, a priority
inversion can occur.
This function is called both with interrupts enabled in
qcom_q6v5_request_stop(), and with interrupts disabled in
ipa_smp2p_panic_notifier(). IRQ handling of spinlocks should be
consistent to avoid the panic notifier deadlocking because it's
sitting on the thread that's already got the lock via _request_stop().
Found via lockdep.
Cc: stable@vger.kernel.org
Fixes:
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|---|---|---|
| .. | ||
| actions | ||
| amlogic | ||
| aspeed | ||
| atmel | ||
| bcm | ||
| dove | ||
| fsl | ||
| gemini | ||
| imx | ||
| ixp4xx | ||
| kendryte | ||
| lantiq | ||
| mediatek | ||
| qcom | ||
| renesas | ||
| rockchip | ||
| samsung | ||
| sifive | ||
| sunxi | ||
| tegra | ||
| ti | ||
| ux500 | ||
| versatile | ||
| xilinx | ||
| zte | ||
| Kconfig | ||
| Makefile | ||