Hello Jianyun Li,
The patch f0c568a478f0: "[SCSI] mvumi: Add Marvell UMI driver" from
May 11, 2011, leads to the following warning:
drivers/scsi/mvumi.c:121 mvumi_alloc_mem_resource()
error: scheduling with locks held: 'spin_lock:host_lock'
The problem is that we do a couple GPF_KERNEL allocations in
mvumi_alloc_mem_resource() and this static analysis program sees a path
where that function is called with spin_locks held.
mvumi_isr_handler() <- takes a spin lock
-> mvumi_handshake()
-> mvumi_init_data()
-> mvumi_alloc_mem_resource() <- GFP_KERNEL
The IRQ handler does print a warning before calling mvumi_handshake()
so it seems like this path doesn't get exercised very much.
regards,
dan carpenter
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