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Diffstat (limited to 'arch/x86/mm/kmmio.c')
-rw-r--r--arch/x86/mm/kmmio.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/mm/kmmio.c b/arch/x86/mm/kmmio.c
index 4c66bd3a240d..9f205030d9aa 100644
--- a/arch/x86/mm/kmmio.c
+++ b/arch/x86/mm/kmmio.c
@@ -38,7 +38,8 @@ struct kmmio_fault_page {
38 /* 38 /*
39 * Number of times this page has been registered as a part 39 * Number of times this page has been registered as a part
40 * of a probe. If zero, page is disarmed and this may be freed. 40 * of a probe. If zero, page is disarmed and this may be freed.
41 * Used only by writers (RCU). 41 * Used only by writers (RCU) and post_kmmio_handler().
42 * Protected by kmmio_lock, when linked into kmmio_page_table.
42 */ 43 */
43 int count; 44 int count;
44}; 45};
@@ -317,7 +318,11 @@ static int post_kmmio_handler(unsigned long condition, struct pt_regs *regs)
317 if (ctx->probe && ctx->probe->post_handler) 318 if (ctx->probe && ctx->probe->post_handler)
318 ctx->probe->post_handler(ctx->probe, condition, regs); 319 ctx->probe->post_handler(ctx->probe, condition, regs);
319 320
320 arm_kmmio_fault_page(ctx->fpage); 321 /* Prevent racing against release_kmmio_fault_page(). */
322 spin_lock(&kmmio_lock);
323 if (ctx->fpage->count)
324 arm_kmmio_fault_page(ctx->fpage);
325 spin_unlock(&kmmio_lock);
321 326
322 regs->flags &= ~X86_EFLAGS_TF; 327 regs->flags &= ~X86_EFLAGS_TF;
323 regs->flags |= ctx->saved_flags; 328 regs->flags |= ctx->saved_flags;