/* * perf_hooks.c * * Copyright (C) 2016 Wang Nan * Copyright (C) 2016 Huawei Inc. */ #include #include #include #include #include "util/util.h" #include "util/debug.h" #include "util/perf-hooks.h" static sigjmp_buf jmpbuf; static const struct perf_hook_desc *current_perf_hook; void perf_hooks__invoke(const struct perf_hook_desc *desc) { if (!(desc && desc->p_hook_func && *desc->p_hook_func)) return; if (sigsetjmp(jmpbuf, 1)) { pr_warning("Fatal error (SEGFAULT) in perf hook '%s'\n", desc->hook_name); *(current_perf_hook->p_hook_func) = NULL; } else { current_perf_hook = desc; (**desc->p_hook_func)(desc->hook_ctx); } current_perf_hook = NULL; } void perf_hooks__recover(void) { if (current_perf_hook) siglongjmp(jmpbuf, 1); } #define PERF_HOOK(name) \ perf_hook_func_t __perf_hook_func_##name = NULL; \ struct perf_hook_desc __perf_hook_desc_##name = \ {.hook_name = #name, \ .p_hook_func = &__perf_hook_func_##name, \ .hook_ctx = NULL}; #include "perf-hooks-list.h" #undef PERF_HOOK #define PERF_HOOK(name) \ &__perf_hook_desc_##name, static struct perf_hook_desc *perf_hooks[] = { #include "perf-hooks-list.h" }; #undef PERF_HOOK int perf_hooks__set_hook(const char *hook_name, perf_hook_func_t hook_func, void *hook_ctx) { unsigned int i; for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) { if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0) continue; if (*(perf_hooks[i]->p_hook_func)) pr_warning("Overwrite existing hook: %s\n", hook_name); *(perf_hooks[i]->p_hook_func) = hook_func; perf_hooks[i]->hook_ctx = hook_ctx; return 0; } return -ENOENT; } perf_hook_func_t perf_hooks__get_hook(const char *hook_name) { unsigned int i; for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) { if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0) continue; return *(perf_hooks[i]->p_hook_func); } return ERR_PTR(-ENOENT); } 5c94eca944be9cd23dfc752'>treecommitdiff
path: root/drivers/usb/serial/Makefile
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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 /drivers/usb/serial/Makefile
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 'drivers/usb/serial/Makefile')