/*
* POWER Data Stream Control Register (DSCR) sysfs interface test
*
* This test updates to system wide DSCR default through the sysfs interface
* and then verifies that all the CPU specific DSCR defaults are updated as
* well verified from their sysfs interfaces.
*
* Copyright 2015, Anshuman Khandual, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include "dscr.h"
static int check_cpu_dscr_default(char *file, unsigned long val)
{
char buf[10];
int fd, rc;
fd = open(file, O_RDWR);
if (fd == -1) {
perror("open() failed");
return 1;
}
rc = read(fd, buf, sizeof(buf));
if (rc == -1) {
perror("read() failed");
return 1;
}
close(fd);
buf[rc] = '\0';
if (strtol(buf, NULL, 16) != val) {
printf("DSCR match failed: %ld (system) %ld (cpu)\n",
val, strtol(buf, NULL, 16));
return 1;
}
return 0;
}
static int check_all_cpu_dscr_defaults(unsigned long val)
{
DIR *sysfs;
struct dirent *dp;
char file[LEN_MAX];
sysfs = opendir(CPU_PATH);
if (!sysfs) {
perror("opendir() failed");
return 1;
}
while ((dp = readdir(sysfs))) {
if (!(dp->d_type & DT_DIR))
continue;
if (!strcmp(dp->d_name, "cpuidle"))
continue;
if (!strstr(dp->d_name, "cpu"))
continue;
sprintf(file, "%s%s/dscr", CPU_PATH, dp->d_name);
if (access(file, F_OK))
continue;
if (check_cpu_dscr_default(file, val))
return 1;
}
closedir(sysfs);
return 0;
}
int dscr_sysfs(void)
{
unsigned long orig_dscr_default;
int i, j;
orig_dscr_default = get_default_dscr();
for (i = 0; i < COUNT; i++) {
for (j = 0; j < DSCR_MAX; j++) {
set_default_dscr(j);
if (check_all_cpu_dscr_defaults(j))
goto fail;
}
}
set_default_dscr(orig_dscr_default);
return 0;
fail:
set_default_dscr(orig_dscr_default);
return 1;
}
int main(int argc, char *argv[])
{
return test_harness(dscr_sysfs, "dscr_sysfs_test");
}
an/Makefile?id=9eb7aa891101a4a09114ff3191f9877ea35eae06'>commitdiff|
|
cifs: initialize file_info_lock
Reviewed-by: Jeff Layton <jlayton@redhat.com>
CC: Stable <stable@vger.kernel.org>
file_info_lock is not initalized in initiate_cifs_search(), leading to the
following splat after a simple "mount.cifs ... dir && ls dir/":
BUG: spinlock bad magic on CPU#0, ls/486
lock: 0xffff880009301110, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
CPU: 0 PID: 486 Comm: ls Not tainted 4.9.0 #27
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
ffffc900042f3db0 ffffffff81327533 0000000000000000 ffff880009301110
ffffc900042f3dd0 ffffffff810baf75 ffff880009301110 ffffffff817ae077
ffffc900042f3df0 ffffffff810baff6 ffff880009301110 ffff880008d69900
Call Trace:
[<ffffffff81327533>] dump_stack+0x65/0x92
[<ffffffff810baf75>] spin_dump+0x85/0xe0
[<ffffffff810baff6>] spin_bug+0x26/0x30
[<ffffffff810bb159>] do_raw_spin_lock+0xe9/0x130
[<ffffffff8159ad2f>] _raw_spin_lock+0x1f/0x30
[<ffffffff8127e50d>] cifs_closedir+0x4d/0x100
[<ffffffff81181cfd>] __fput+0x5d/0x160
[<ffffffff81181e3e>] ____fput+0xe/0x10
[<ffffffff8109410e>] task_work_run+0x7e/0xa0
[<ffffffff81002512>] exit_to_usermode_loop+0x92/0xa0
[<ffffffff810026f9>] syscall_return_slowpath+0x49/0x50
[<ffffffff8159b484>] entry_SYSCALL_64_fastpath+0xa7/0xa9
Fixes: 3afca265b5f53a0 ("Clarify locking of cifs file and tcon structures and make more granular")
Signed-off-by: Rabin Vincent <rabinv@axis.com>
Signed-off-by: Steve French <smfrench@gmail.com>