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06709e81c6
kernel_optimize_test/lib
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John Garry 06709e81c6 lib: logic_pio: Fix RCU usage 
The traversing of io_range_list with list_for_each_entry_rcu()
is not properly protected by rcu_read_lock() and rcu_read_unlock(),
so add them.

These functions mark the critical section scope where the list is
protected for the reader, it cannot be  "reclaimed". Any updater - in
this case, the logical PIO registration functions - cannot update the
list until the reader exits this critical section.

In addition, the list traversing used in logic_pio_register_range()
does not need to use the rcu variant.

This is because we are already using io_range_mutex to guarantee mutual
exclusion from mutating the list.

Cc: stable@vger.kernel.org
Fixes: 031e360186 ("lib: Add generic PIO mapping method")
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
2019-08-13 14:48:54 +08:00
..
842 lib: 842: no need to check return value of debugfs_create functions 2019-07-03 16:57:17 +02:00
crypto crypto: arc4 - refactor arc4 core code into separate library 2019-06-20 14:18:33 +08:00
dim linux/dim: Implement RDMA adaptive moderation (DIM) 2019-07-08 16:37:21 -03:00
fonts fonts: Prefer a bigger font for high resolution screens 2019-06-20 10:11:24 +02:00
livepatch
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mpi lib/mpi/longlong.h: fix building with 32-bit x86 2019-07-16 19:23:21 -07:00
raid6 Kbuild updates for v5.3 2019-07-12 16:03:16 -07:00
reed_solomon rslib: Make some functions static 2019-07-02 08:41:37 +02:00
vdso lib/vdso: Make delta calculation work correctly 2019-06-26 14:26:53 +02:00
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.gitignore
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dynamic_queue_limits.c
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locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-rtmutex.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
locking-selftest.c
lockref.c lockref: Limit number of cmpxchg loop retries 2019-06-07 13:15:06 -07:00
logic_pio.c lib: logic_pio: Fix RCU usage 2019-08-13 14:48:54 +08:00
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