/**************************************************************************** * Driver for Solarflare network controllers and boards * Copyright 2005-2006 Fen Systems Ltd. * Copyright 2006-2012 Solarflare Communications Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation, incorporated herein by reference. */ #ifndef EFX_SELFTEST_H #define EFX_SELFTEST_H #include "net_driver.h" /* * Self tests */ struct efx_loopback_self_tests { int tx_sent[EFX_TXQ_TYPES]; int tx_done[EFX_TXQ_TYPES]; int rx_good; int rx_bad; }; #define EFX_MAX_PHY_TESTS 20 /* Efx self test results * For fields which are not counters, 1 indicates success and -1 * indicates failure. */ struct efx_self_tests { /* online tests */ int phy_alive; int nvram; int interrupt; int eventq_dma[EFX_MAX_CHANNELS]; int eventq_int[EFX_MAX_CHANNELS]; /* offline tests */ int memory; int registers; int phy_ext[EFX_MAX_PHY_TESTS]; struct efx_loopback_self_tests loopback[LOOPBACK_TEST_MAX + 1]; }; void efx_loopback_rx_packet(struct efx_nic *efx, const char *buf_ptr, int pkt_len); int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests, unsigned flags); void efx_selftest_async_start(struct efx_nic *efx); void efx_selftest_async_cancel(struct efx_nic *efx); void efx_selftest_async_work(struct work_struct *data); #endif /* EFX_SELFTEST_H */ Tobias Klauser
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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/iio/Makefile
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 'tools/iio/Makefile')