Chengfeng Ye 35c63d366f
atm: solos-pci: Fix potential deadlock on &cli_queue_lock ...
[ Upstream commit d5dba32b8f6cb39be708b726044ba30dbc088b30 ]
As &card->cli_queue_lock is acquired under softirq context along the
following call chain from solos_bh(), other acquisition of the same
lock inside process context should disable at least bh to avoid double
lock.
<deadlock #1>
console_show()
--> spin_lock(&card->cli_queue_lock)
<interrupt>
--> solos_bh()
--> spin_lock(&card->cli_queue_lock)
This flaw was found by an experimental static analysis tool I am
developing for irq-related deadlock.
To prevent the potential deadlock, the patch uses spin_lock_bh()
on the card->cli_queue_lock under process context code consistently
to prevent the possible deadlock scenario.
Fixes: 9c54004ea7dg573847474@gmail.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
Signed-off-by: Sasha Levin <sashal@kernel.org >
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