/* * alloc.h - persistent object (dat entry/disk inode) allocator/deallocator * * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * Originally written by Koji Sato. * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji. */ #ifndef _NILFS_ALLOC_H #define _NILFS_ALLOC_H #include #include #include /** * nilfs_palloc_entries_per_group - get the number of entries per group * @inode: inode of metadata file using this allocator * * The number of entries per group is defined by the number of bits * that a bitmap block can maintain. */ static inline unsigned long nilfs_palloc_entries_per_group(const struct inode *inode) { return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */); } int nilfs_palloc_init_blockgroup(struct inode *, unsigned int); int nilfs_palloc_get_entry_block(struct inode *, __u64, int, struct buffer_head **); void *nilfs_palloc_block_get_entry(const struct inode *, __u64, const struct buffer_head *, void *); int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *); /** * nilfs_palloc_req - persistent allocator request and reply * @pr_entry_nr: entry number (vblocknr or inode number) * @pr_desc_bh: buffer head of the buffer containing block group descriptors * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap * @pr_entry_bh: buffer head of the buffer containing translation entries */ struct nilfs_palloc_req { __u64 pr_entry_nr; struct buffer_head *pr_desc_bh; struct buffer_head *pr_bitmap_bh; struct buffer_head *pr_entry_bh; }; int nilfs_palloc_prepare_alloc_entry(struct inode *, struct nilfs_palloc_req *); void nilfs_palloc_commit_alloc_entry(struct inode *, struct nilfs_palloc_req *); void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *); void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *); int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *); void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *); int nilfs_palloc_freev(struct inode *, __u64 *, size_t); #define nilfs_set_bit_atomic ext2_set_bit_atomic #define nilfs_clear_bit_atomic ext2_clear_bit_atomic #define nilfs_find_next_zero_bit find_next_zero_bit_le #define nilfs_find_next_bit find_next_bit_le /** * struct nilfs_bh_assoc - block offset and buffer head association * @blkoff: block offset * @bh: buffer head */ struct nilfs_bh_assoc { unsigned long blkoff; struct buffer_head *bh; }; /** * struct nilfs_palloc_cache - persistent object allocator cache * @lock: cache protecting lock * @prev_desc: blockgroup descriptors cache * @prev_bitmap: blockgroup bitmap cache * @prev_entry: translation entries cache */ struct nilfs_palloc_cache { spinlock_t lock; struct nilfs_bh_assoc prev_desc; struct nilfs_bh_assoc prev_bitmap; struct nilfs_bh_assoc prev_entry; }; void nilfs_palloc_setup_cache(struct inode *inode, struct nilfs_palloc_cache *cache); void nilfs_palloc_clear_cache(struct inode *inode); void nilfs_palloc_destroy_cache(struct inode *inode); #endif /* _NILFS_ALLOC_H */ class='cgit-panel'>diff options
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authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /include/crypto/internal/rng.h
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'include/crypto/internal/rng.h')