/* * Load firmware files from Analog Devices SigmaStudio * * Copyright 2009-2011 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ #ifndef __SIGMA_FIRMWARE_H__ #define __SIGMA_FIRMWARE_H__ #include #include #include #include struct sigmadsp; struct snd_soc_component; struct snd_pcm_substream; struct sigmadsp_ops { int (*safeload)(struct sigmadsp *sigmadsp, unsigned int addr, const uint8_t *data, size_t len); }; struct sigmadsp { const struct sigmadsp_ops *ops; struct list_head ctrl_list; struct list_head data_list; struct snd_pcm_hw_constraint_list rate_constraints; unsigned int current_samplerate; struct snd_soc_component *component; struct device *dev; struct mutex lock; void *control_data; int (*write)(void *, unsigned int, const uint8_t *, size_t); int (*read)(void *, unsigned int, uint8_t *, size_t); }; struct sigmadsp *devm_sigmadsp_init(struct device *dev, const struct sigmadsp_ops *ops, const char *firmware_name); void sigmadsp_reset(struct sigmadsp *sigmadsp); int sigmadsp_restrict_params(struct sigmadsp *sigmadsp, struct snd_pcm_substream *substream); struct i2c_client; struct sigmadsp *devm_sigmadsp_init_regmap(struct device *dev, struct regmap *regmap, const struct sigmadsp_ops *ops, const char *firmware_name); struct sigmadsp *devm_sigmadsp_init_i2c(struct i2c_client *client, const struct sigmadsp_ops *ops, const char *firmware_name); int sigmadsp_attach(struct sigmadsp *sigmadsp, struct snd_soc_component *component); int sigmadsp_setup(struct sigmadsp *sigmadsp, unsigned int rate); void sigmadsp_reset(struct sigmadsp *sigmadsp); #endif t-next.git/log/net/6lowpan/nhc_udp.c'>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 /net/6lowpan/nhc_udp.c
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>
Diffstat (limited to 'net/6lowpan/nhc_udp.c')