/* Copyright (c) 2016 Facebook * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #include "percpu_freelist.h" int pcpu_freelist_init(struct pcpu_freelist *s) { int cpu; s->freelist = alloc_percpu(struct pcpu_freelist_head); if (!s->freelist) return -ENOMEM; for_each_possible_cpu(cpu) { struct pcpu_freelist_head *head = per_cpu_ptr(s->freelist, cpu); raw_spin_lock_init(&head->lock); head->first = NULL; } return 0; } void pcpu_freelist_destroy(struct pcpu_freelist *s) { free_percpu(s->freelist); } static inline void __pcpu_freelist_push(struct pcpu_freelist_head *head, struct pcpu_freelist_node *node) { raw_spin_lock(&head->lock); node->next = head->first; head->first = node; raw_spin_unlock(&head->lock); } void pcpu_freelist_push(struct pcpu_freelist *s, struct pcpu_freelist_node *node) { struct pcpu_freelist_head *head = this_cpu_ptr(s->freelist); __pcpu_freelist_push(head, node); } void pcpu_freelist_populate(struct pcpu_freelist *s, void *buf, u32 elem_size, u32 nr_elems) { struct pcpu_freelist_head *head; unsigned long flags; int i, cpu, pcpu_entries; pcpu_entries = nr_elems / num_possible_cpus() + 1; i = 0; /* disable irq to workaround lockdep false positive * in bpf usage pcpu_freelist_populate() will never race * with pcpu_freelist_push() */ local_irq_save(flags); for_each_possible_cpu(cpu) { again: head = per_cpu_ptr(s->freelist, cpu); __pcpu_freelist_push(head, buf); i++; buf += elem_size; if (i == nr_elems) break; if (i % pcpu_entries) goto again; } local_irq_restore(flags); } struct pcpu_freelist_node *pcpu_freelist_pop(struct pcpu_freelist *s) { struct pcpu_freelist_head *head; struct pcpu_freelist_node *node; int orig_cpu, cpu; orig_cpu = cpu = raw_smp_processor_id(); while (1) { head = per_cpu_ptr(s->freelist, cpu); raw_spin_lock(&head->lock); node = head->first; if (node) { head->first = node->next; raw_spin_unlock(&head->lock); return node; } raw_spin_unlock(&head->lock); cpu = cpumask_next(cpu, cpu_possible_mask); if (cpu >= nr_cpu_ids) cpu = 0; if (cpu == orig_cpu) return NULL; } } 'id' value='161e6d44a5e2d3f85365cb717d60e363171b39e6'/>
path: root/drivers/usb/mtu3/mtu3_dr.h
diff options
context:
space:
mode:
authorGabriel Krisman Bertazi <krisman@collabora.co.uk>2017-01-16 12:23:42 -0200
committerUlf Hansson <ulf.hansson@linaro.org>2017-01-31 11:26:49 +0100
commit161e6d44a5e2d3f85365cb717d60e363171b39e6 (patch)
tree5c8b730a137696ef979f05ceae869b6e0348794c /drivers/usb/mtu3/mtu3_dr.h
parent566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)
mmc: sdhci: Ignore unexpected CARD_INT interrupts
One of our kernelCI boxes hanged at boot because a faulty eSDHC device was triggering spurious CARD_INT interrupts for SD cards, causing CMD52 reads, which are not allowed for SD devices. This adds a sanity check to the interruption path, preventing that illegal command from getting sent if the CARD_INT interruption should be disabled. This quirk allows that particular machine to resume boot despite the faulty hardware, instead of getting hung dealing with thousands of mishandled interrupts. Suggested-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Cc: <stable@vger.kernel.org>
Diffstat (limited to 'drivers/usb/mtu3/mtu3_dr.h')