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authorBen Hutchings <ben@decadent.org.uk>2020-09-28 00:50:42 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-10-02 20:01:55 +0300
commit7cecb47f55e00282f972a1e0b09136c8cd938221 (patch)
treebf016b79779583ffdc402c6c94924728e372046c /drivers/acpi/acpi_extlog.c
parenta1b8638ba1320e6684aa98233c15255eb803fac7 (diff)
downloadlinux-7cecb47f55e00282f972a1e0b09136c8cd938221.tar.xz
ACPI / extlog: Check for RDMSR failure
extlog_init() uses rdmsrl() to read an MSR, which on older CPUs provokes a error message at boot: unchecked MSR access error: RDMSR from 0x179 at rIP: 0xcd047307 (native_read_msr+0x7/0x40) Use rdmsrl_safe() instead, and return -ENODEV if it fails. Reported-by: jim@photojim.ca References: https://bugs.debian.org/971058 Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpi_extlog.c')
-rw-r--r--drivers/acpi/acpi_extlog.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index f138e12b7b82..72f1fb77abcd 100644
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -222,9 +222,9 @@ static int __init extlog_init(void)
u64 cap;
int rc;
- rdmsrl(MSR_IA32_MCG_CAP, cap);
-
- if (!(cap & MCG_ELOG_P) || !extlog_get_l1addr())
+ if (rdmsrl_safe(MSR_IA32_MCG_CAP, &cap) ||
+ !(cap & MCG_ELOG_P) ||
+ !extlog_get_l1addr())
return -ENODEV;
rc = -EINVAL;