On Sun, 7 Feb 2021, Xiaofei Tan wrote:

Replace spin_lock_irqsave with spin_lock in hard IRQ of SCSI drivers. 
There are no function changes, but may speed up if interrupt happen too 
often.

This change doesn't necessarily work on platforms that support nested 
interrupts.

Were you able to measure any benefit from this change on some other 
platform?

Please see also,
https://lore.kernel.org/linux-scsi/89c5cb05cb844939ae684db0077f675f@h3c.com/ (local)