/* * Generic C implementation of atomic counter operations. Usable on * UP systems only. Do not include in machine independent code. * * Originally implemented for MN10300. * * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #ifndef __ASM_GENERIC_ATOMIC_H #define __ASM_GENERIC_ATOMIC_H #include #include /* * atomic_$op() - $op integer to atomic variable * @i: integer value to $op * @v: pointer to the atomic variable * * Atomically $ops @i to @v. Does not strictly guarantee a memory-barrier, use * smp_mb__{before,after}_atomic(). */ /* * atomic_$op_return() - $op interer to atomic variable and returns the result * @i: integer value to $op * @v: pointer to the atomic variable * * Atomically $ops @i to @v. Does imply a full memory barrier. */ #ifdef CONFIG_SMP /* we can build all atomic primitives from cmpxchg */ #define ATOMIC_OP(op, c_op) \ static inline void atomic_##op(int i, atomic_t *v) \ { \ int c, old; \ \ c = v->counter; \ while ((old = cmpxchg(&v->counter, c, c c_op i)) != c) \ c = old; \ } #define ATOMIC_OP_RETURN(op, c_op) \ static inline int atomic_##op##_return(int i, atomic_t *v) \ { \ int c, old; \ \ c = v->counter; \ while ((old = cmpxchg(&v->counter, c, c c_op i)) != c) \ c = old; \ \ return c c_op i; \ } #define ATOMIC_FETCH_OP(op, c_op) \ static inline int atomic_fetch_##op(int i, atomic_t *v) \ { \ int c, old; \ \ c = v->counter; \ while ((old = cmpxchg(&v->counter, c, c c_op i)) != c) \ c = old; \ \ return c; \ } #else #include #define ATOMIC_OP(op, c_op) \ static inline void atomic_##op(int i, atomic_t *v) \ { \ unsigned long flags; \ \ raw_local_irq_save(flags); \ v->counter = v->counter c_op i; \ raw_local_irq_restore(flags); \ } #define ATOMIC_OP_RETURN(op, c_op) \ static inline int atomic_##op##_return(int i, atomic_t *v) \ { \ unsigned long flags; \ int ret; \ \ raw_local_irq_save(flags); \ ret = (v->counter = v->counter c_op i); \ raw_local_irq_restore(flags); \ \ return ret; \ } #define ATOMIC_FETCH_OP(op, c_op) \ static inline int atomic_fetch_##op(int i, atomic_t *v) \ { \ unsigned long flags; \ int ret; \ \ raw_local_irq_save(flags); \ ret = v->counter; \ v->counter = v->counter c_op i; \ raw_local_irq_restore(flags); \ \ return ret; \ } #endif /* CONFIG_SMP */ #ifndef atomic_add_return ATOMIC_OP_RETURN(add, +) #endif #ifndef atomic_sub_return ATOMIC_OP_RETURN(sub, -) #endif #ifndef atomic_fetch_add ATOMIC_FETCH_OP(add, +) #endif #ifndef atomic_fetch_sub ATOMIC_FETCH_OP(sub, -) #endif #ifndef atomic_fetch_and ATOMIC_FETCH_OP(and, &) #endif #ifndef atomic_fetch_or ATOMIC_FETCH_OP(or, |) #endif #ifndef atomic_fetch_xor ATOMIC_FETCH_OP(xor, ^) #endif #ifndef atomic_and ATOMIC_OP(and, &) #endif #ifndef atomic_or ATOMIC_OP(or, |) #endif #ifndef atomic_xor ATOMIC_OP(xor, ^) #endif #undef ATOMIC_FETCH_OP #undef ATOMIC_OP_RETURN #undef ATOMIC_OP /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. */ #define ATOMIC_INIT(i) { (i) } /** * atomic_read - read atomic variable * @v: pointer of type atomic_t * * Atomically reads the value of @v. */ #ifndef atomic_read #define atomic_read(v) READ_ONCE((v)->counter) #endif /** * atomic_set - set atomic variable * @v: pointer of type atomic_t * @i: required value * * Atomically sets the value of @v to @i. */ #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) #include static inline int atomic_add_negative(int i, atomic_t *v) { return atomic_add_return(i, v) < 0; } static inline void atomic_add(int i, atomic_t *v) { atomic_add_return(i, v); } static inline void atomic_sub(int i, atomic_t *v) { atomic_sub_return(i, v); } static inline void atomic_inc(atomic_t *v) { atomic_add_return(1, v); } static inline void atomic_dec(atomic_t *v) { atomic_sub_return(1, v); } #define atomic_dec_return(v) atomic_sub_return(1, (v)) #define atomic_inc_return(v) atomic_add_return(1, (v)) #define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) #define atomic_xchg(ptr, v) (xchg(&(ptr)->counter, (v))) #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new))) static inline int __atomic_add_unless(atomic_t *v, int a, int u) { int c, old; c = atomic_read(v); while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c) c = old; return c; } #endif /* __ASM_GENERIC_ATOMIC_H */ mmary='commit info' class='commit-info'> authorChristoph Hellwig <hch@lst.de>2017-01-30 13:15:41 +0100 committerBjorn Helgaas <bhelgaas@google.com>2017-02-02 10:35:46 -0600 commitdfef358bd1beb4e7b5c94eca944be9cd23dfc752 (patch) treeb9a2afb38a4c2ac8ad31f49ec0d71fe9e5b1994c /include/dt-bindings/leds/leds-netxbig.h parent030305d69fc6963c16003f50d7e8d74b02d0a143 (diff)
PCI/MSI: Don't apply affinity if there aren't enough vectors left
Bart reported a problem wіth an out of bounds access in the low-level IRQ affinity code, which we root caused to the qla2xxx driver assigning all its MSI-X vectors to the pre and post vectors, and not having any left for the actually spread IRQs. Fix this issue by not asking for affinity assignment when there are no vectors to assign left. Fixes: 402723ad5c62 ("PCI/MSI: Provide pci_alloc_irq_vectors_affinity()") Link: https://lkml.kernel.org/r/1485359225.3093.3.camel@sandisk.com Reported-by: Bart Van Assche <bart.vanassche@sandisk.com> Tested-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include/dt-bindings/leds/leds-netxbig.h')