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usb: musb: fix runtime PM in debugfs 

MUSB driver now has runtime PM support, but the debugfs driver misses
the PM _get/_put() calls, which could cause MUSB register access
failure.

Cc: stable@vger.kernel.org # 4.9+
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bin Liu 2017-01-10 10:46:00 -06:00 committed by Greg Kroah-Hartman
parent 620f1a632e
commit 7b6c1b4c0e
1 changed files with 19 additions and 1 deletions
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20
drivers/usb/musb/musb_debugfs.c
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@ -114,6 +114,7 @@ static int musb_regdump_show(struct seq_file *s, void *unused)
unsigned i;
seq_printf(s, "MUSB (M)HDRC Register Dump\n");
pm_runtime_get_sync(musb->controller);
for (i = 0; i < ARRAY_SIZE(musb_regmap); i++) {
switch (musb_regmap[i].size) {
@ -132,6 +133,8 @@ static int musb_regdump_show(struct seq_file *s, void *unused)
}
}
pm_runtime_mark_last_busy(musb->controller);
pm_runtime_put_autosuspend(musb->controller);
return 0;
}
@ -145,7 +148,10 @@ static int musb_test_mode_show(struct seq_file *s, void *unused)
struct musb *musb = s->private;
unsigned test;
pm_runtime_get_sync(musb->controller);
test = musb_readb(musb->mregs, MUSB_TESTMODE);
pm_runtime_mark_last_busy(musb->controller);
pm_runtime_put_autosuspend(musb->controller);
if (test & MUSB_TEST_FORCE_HOST)
seq_printf(s, "force host\n");
@ -194,11 +200,12 @@ static ssize_t musb_test_mode_write(struct file *file,
u8 test;
char buf[18];
pm_runtime_get_sync(musb->controller);
test = musb_readb(musb->mregs, MUSB_TESTMODE);
if (test) {
dev_err(musb->controller, "Error: test mode is already set. "
"Please do USB Bus Reset to start a new test.\n");
return count;
goto ret;
}
memset(buf, 0x00, sizeof(buf));
@ -234,6 +241,9 @@ static ssize_t musb_test_mode_write(struct file *file,
musb_writeb(musb->mregs, MUSB_TESTMODE, test);
ret:
pm_runtime_mark_last_busy(musb->controller);
pm_runtime_put_autosuspend(musb->controller);
return count;
}
@ -254,8 +264,13 @@ static int musb_softconnect_show(struct seq_file *s, void *unused)
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_HOST:
case OTG_STATE_A_WAIT_BCON:
pm_runtime_get_sync(musb->controller);
reg = musb_readb(musb->mregs, MUSB_DEVCTL);
connect = reg & MUSB_DEVCTL_SESSION ? 1 : 0;
pm_runtime_mark_last_busy(musb->controller);
pm_runtime_put_autosuspend(musb->controller);
break;
default:
connect = -1;
@ -284,6 +299,7 @@ static ssize_t musb_softconnect_write(struct file *file,
if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
return -EFAULT;
pm_runtime_get_sync(musb->controller);
if (!strncmp(buf, "0", 1)) {
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_HOST:
@ -314,6 +330,8 @@ static ssize_t musb_softconnect_write(struct file *file,
}
}
pm_runtime_mark_last_busy(musb->controller);
pm_runtime_put_autosuspend(musb->controller);
return count;
}