/* * Driver for ADAU1361/ADAU1461/ADAU1761/ADAU1961 codec * * Copyright 2014 Analog Devices Inc. * Author: Lars-Peter Clausen * * Licensed under the GPL-2. */ #include #include #include #include #include #include "adau1761.h" static int adau1761_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct regmap_config config; config = adau1761_regmap_config; config.val_bits = 8; config.reg_bits = 16; return adau1761_probe(&client->dev, devm_regmap_init_i2c(client, &config), id->driver_data, NULL); } static int adau1761_i2c_remove(struct i2c_client *client) { adau17x1_remove(&client->dev); return 0; } static const struct i2c_device_id adau1761_i2c_ids[] = { { "adau1361", ADAU1361 }, { "adau1461", ADAU1761 }, { "adau1761", ADAU1761 }, { "adau1961", ADAU1361 }, { } }; MODULE_DEVICE_TABLE(i2c, adau1761_i2c_ids); #if defined(CONFIG_OF) static const struct of_device_id adau1761_i2c_dt_ids[] = { { .compatible = "adi,adau1361", }, { .compatible = "adi,adau1461", }, { .compatible = "adi,adau1761", }, { .compatible = "adi,adau1961", }, { }, }; MODULE_DEVICE_TABLE(of, adau1761_i2c_dt_ids); #endif static struct i2c_driver adau1761_i2c_driver = { .driver = { .name = "adau1761", .of_match_table = of_match_ptr(adau1761_i2c_dt_ids), }, .probe = adau1761_i2c_probe, .remove = adau1761_i2c_remove, .id_table = adau1761_i2c_ids, }; module_i2c_driver(adau1761_i2c_driver); MODULE_DESCRIPTION("ASoC ADAU1361/ADAU1461/ADAU1761/ADAU1961 CODEC I2C driver"); MODULE_AUTHOR("Lars-Peter Clausen "); MODULE_LICENSE("GPL"); s/perf'>logtreecommitdiff
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authorEric W. Biederman <ebiederm@xmission.com>2017-01-03 14:18:43 +1300
committerEric W. Biederman <ebiederm@xmission.com>2017-01-10 13:34:43 +1300
commit3895dbf8985f656675b5bde610723a29cbce3fa7 (patch)
tree91d4517f09918fd573998eb40b8f35f08ed1c470 /tools/perf
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
mnt: Protect the mountpoint hashtable with mount_lock
Protecting the mountpoint hashtable with namespace_sem was sufficient until a call to umount_mnt was added to mntput_no_expire. At which point it became possible for multiple calls of put_mountpoint on the same hash chain to happen on the same time. Kristen Johansen <kjlx@templeofstupid.com> reported: > This can cause a panic when simultaneous callers of put_mountpoint > attempt to free the same mountpoint. This occurs because some callers > hold the mount_hash_lock, while others hold the namespace lock. Some > even hold both. > > In this submitter's case, the panic manifested itself as a GP fault in > put_mountpoint() when it called hlist_del() and attempted to dereference > a m_hash.pprev that had been poisioned by another thread. Al Viro observed that the simple fix is to switch from using the namespace_sem to the mount_lock to protect the mountpoint hash table. I have taken Al's suggested patch moved put_mountpoint in pivot_root (instead of taking mount_lock an additional time), and have replaced new_mountpoint with get_mountpoint a function that does the hash table lookup and addition under the mount_lock. The introduction of get_mounptoint ensures that only the mount_lock is needed to manipulate the mountpoint hashtable. d_set_mounted is modified to only set DCACHE_MOUNTED if it is not already set. This allows get_mountpoint to use the setting of DCACHE_MOUNTED to ensure adding a struct mountpoint for a dentry happens exactly once. Cc: stable@vger.kernel.org Fixes: ce07d891a089 ("mnt: Honor MNT_LOCKED when detaching mounts") Reported-by: Krister Johansen <kjlx@templeofstupid.com> Suggested-by: Al Viro <viro@ZenIV.linux.org.uk> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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