[PATCH] cpufreq: amd-pstate: fix global sysfs attribute type - Linux-stable-mirror

7 Aug 2023

In commit 3666062b87ec ("cpufreq: amd-pstate: move to use bus_get_dev_root()")
the "amd_pstate" attributes where moved from a dedicated kobject to the
cpu root kobject.
While the dedicated kobject expects to contain kobj_attributes the root
kobject needs device_attributes.
As the changed arguments are not used by the callbacks it works most of
the time.
However CFI will detect this issue:
[ 4947.849350] CFI failure at dev_attr_show+0x24/0x60 (target: show_status+0x0/0x70; expected type: 0x8651b1de)
...
[ 4947.849409] Call Trace:
[ 4947.849410]  <TASK>
[ 4947.849411]  ? __warn+0xcf/0x1c0
[ 4947.849414]  ? dev_attr_show+0x24/0x60
[ 4947.849415]  ? report_cfi_failure+0x4e/0x60
[ 4947.849417]  ? handle_cfi_failure+0x14c/0x1d0
[ 4947.849419]  ? __cfi_show_status+0x10/0x10
[ 4947.849420]  ? handle_bug+0x4f/0x90
[ 4947.849421]  ? exc_invalid_op+0x1a/0x60
[ 4947.849422]  ? asm_exc_invalid_op+0x1a/0x20
[ 4947.849424]  ? __cfi_show_status+0x10/0x10
[ 4947.849425]  ? dev_attr_show+0x24/0x60
[ 4947.849426]  sysfs_kf_seq_show+0xa6/0x110
[ 4947.849433]  seq_read_iter+0x16c/0x4b0
[ 4947.849436]  vfs_read+0x272/0x2d0
[ 4947.849438]  ksys_read+0x72/0xe0
[ 4947.849439]  do_syscall_64+0x76/0xb0
[ 4947.849440]  ? do_user_addr_fault+0x252/0x650
[ 4947.849442]  ? exc_page_fault+0x7a/0x1b0
[ 4947.849443]  entry_SYSCALL_64_after_hwframe+0x72/0xdc
Reported-by: Jannik Glückert jannik.glueckert@gmail.com
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217765
Link: https://lore.kernel.org/lkml/c7f1bf9b-b183-bf6e-1cbb-d43f72494083@gmail.com/
Fixes: 3666062b87ec ("cpufreq: amd-pstate: move to use bus_get_dev_root()")
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Weißschuh linux@weissschuh.net
---
Note:
This was not tested with CFI as I don't have the toolchain available.
Jannik, could you give it a spin?
---
 drivers/cpufreq/amd-pstate.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 81fba0dcbee9..9a1e194d5cf8 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -1012,8 +1012,8 @@ static int amd_pstate_update_status(const char *buf, size_t size)
    return 0;
 }
-static ssize_t show_status(struct kobject *kobj,
-			   struct kobj_attribute *attr, char *buf)
+static ssize_t status_show(struct device *dev,
+			   struct device_attribute *attr, char *buf)
 {
    ssize_t ret;
@@ -1024,7 +1024,7 @@ static ssize_t show_status(struct kobject *kobj,
    return ret;
 }
-static ssize_t store_status(struct kobject *a, struct kobj_attribute *b,
+static ssize_t status_store(struct device *a, struct device_attribute *b,
    		    const char *buf, size_t count)
 {
    char *p = memchr(buf, '\n', count);
@@ -1043,7 +1043,7 @@ cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
 cpufreq_freq_attr_ro(amd_pstate_highest_perf);
 cpufreq_freq_attr_rw(energy_performance_preference);
 cpufreq_freq_attr_ro(energy_performance_available_preferences);
-define_one_global_rw(status);
+static DEVICE_ATTR_RW(status);
static struct freq_attr *amd_pstate_attr[] = {
    &amd_pstate_max_freq,
@@ -1062,7 +1062,7 @@ static struct freq_attr *amd_pstate_epp_attr[] = {
 };
static struct attribute *pstate_global_attributes[] = {
-	&status.attr,
+	&dev_attr_status.attr,
    NULL
 };
---
base-commit: 52a93d39b17dc7eb98b6aa3edb93943248e03b2f
change-id: 20230807-amd-pstate-cfi-8302498c54f5
Best regards,
-- 
Thomas Weißschuh linux@weissschuh.net


    