pcie-uniphier: race condition in masking/unmasking interrupts

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello!

Marc pointed during review of pci-aardvark patches one issue which I see
that is available also in the current pcie-uniphier.c driver.

When masking or unmasking interrupts there is read-modify-write sequence
for PCL_RCV_INTX_MASK_SHIFT register without any locking:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/controller/dwc/pcie-uniphier.c?h=v5.13#n171

So when trying to mask/unmask two interrupts at the same time there is
race condition as updating that PCL_RCV_INTX_MASK_SHIFT register is not
atomic.

Could you look at it?



[Index of Archives]     [DMA Engine]     [Linux Coverity]     [Linux USB]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Greybus]

  Powered by Linux