Commit-ID: 3f4a7836e33134d4ac34fa7c99788f0c6a79fa1c
Gitweb: http://git.kernel.org/tip/3f4a7836e33134d4ac34fa7c99788f0c6a79fa1c
Author: Matt Fleming <matt.fleming@xxxxxxxxx>
AuthorDate: Thu, 13 Mar 2014 19:41:08 +0000
Committer: Matt Fleming <matt.fleming@xxxxxxxxx>
CommitDate: Mon, 17 Mar 2014 21:54:28 +0000
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 <dan.carpenter@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Nathan Zimmer <nzimmer@xxxxxxx>
Cc: Matthew Garrett <mjg59@xxxxxxxxxxxxx>
Cc: Jan Beulich <JBeulich@xxxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
---
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 43e7cf6..3781dd3 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;
--
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