From 3f4a7836e33134d4ac34fa7c99788f0c6a79fa1c Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Thu, 13 Mar 2014 19:41:08 +0000 Subject: [PATCH] x86/efi: Rip out phys_efi_get_time() Dan reported that phys_efi_get_time() is doing kmalloc(..., GFP_KERNEL) under a spinlock which is very clearly a bug. Since phys_efi_get_time() has no users let's just delete it instead of trying to fix it. Note that since there are no users of phys_efi_get_time(), it is not possible to actually trigger a GFP_KERNEL alloc under the spinlock. Reported-by: Dan Carpenter Cc: Ingo Molnar Cc: H. Peter Anvin Cc: Nathan Zimmer Cc: Matthew Garrett Cc: Jan Beulich Signed-off-by: Matt Fleming --- arch/x86/platform/efi/efi.c | 29 ----------------------------- 1 file changed, 29 deletions(-) diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index 43e7cf6c6111..3781dd39e8bd 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -246,21 +246,6 @@ static efi_status_t __init phys_efi_set_virtual_address_map( return status; } -static efi_status_t __init phys_efi_get_time(efi_time_t *tm, - efi_time_cap_t *tc) -{ - unsigned long flags; - efi_status_t status; - - spin_lock_irqsave(&rtc_lock, flags); - efi_call_phys_prelog(); - status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), - virt_to_phys(tc)); - efi_call_phys_epilog(); - spin_unlock_irqrestore(&rtc_lock, flags); - return status; -} - int efi_set_rtc_mmss(const struct timespec *now) { unsigned long nowtime = now->tv_sec; @@ -592,16 +577,9 @@ static int __init efi_runtime_init32(void) * EFI runtime services before set_virtual_address_map * is invoked. */ - efi_phys.get_time = (efi_get_time_t *) - (unsigned long)runtime->get_time; efi_phys.set_virtual_address_map = (efi_set_virtual_address_map_t *) (unsigned long)runtime->set_virtual_address_map; - /* - * Make efi_get_time can be called before entering - * virtual mode. - */ - efi.get_time = phys_efi_get_time; early_iounmap(runtime, sizeof(efi_runtime_services_32_t)); return 0; @@ -623,16 +601,9 @@ static int __init efi_runtime_init64(void) * EFI runtime services before set_virtual_address_map * is invoked. */ - efi_phys.get_time = (efi_get_time_t *) - (unsigned long)runtime->get_time; efi_phys.set_virtual_address_map = (efi_set_virtual_address_map_t *) (unsigned long)runtime->set_virtual_address_map; - /* - * Make efi_get_time can be called before entering - * virtual mode. - */ - efi.get_time = phys_efi_get_time; early_iounmap(runtime, sizeof(efi_runtime_services_64_t)); return 0; -- 2.20.1