cpufreq: amd-pstate: fix global sysfs attribute type

In commit 3666062 ("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

Fixes: 3666062 ("cpufreq: amd-pstate: move to use bus_get_dev_root()")
Reported-by: Jannik Glückert <[email protected]>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217765
Link: https://lore.kernel.org/lkml/[email protected]/
Cc: All applicable <[email protected]>
Signed-off-by: Thomas Weißschuh <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: t-8ch

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
 };