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author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2013-03-20 17:06:20 (GMT) |
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committer | Scott Wood <scottwood@freescale.com> | 2015-02-13 22:21:06 (GMT) |
commit | 931073c6313685f5c713201fbc0759cd0cdc1397 (patch) | |
tree | 8eb534228bc430f1e78d2fa6a5118d0f8ca826ed /crypto | |
parent | 74ec05f9505c5e05038d4de5b1d8cc714574ce07 (diff) | |
download | linux-fsl-qoriq-931073c6313685f5c713201fbc0759cd0cdc1397.tar.xz |
net: Add a mutex around devnet_rename_seq
On RT write_seqcount_begin() disables preemption and device_rename()
allocates memory with GFP_KERNEL and grabs later the sysfs_mutex
mutex. Serialize with a mutex and add use the non preemption disabling
__write_seqcount_begin().
To avoid writer starvation, let the reader grab the mutex and release
it when it detects a writer in progress. This keeps the normal case
(no reader on the fly) fast.
[ tglx: Instead of replacing the seqcount by a mutex, add the mutex ]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions