[PATCH] Staging: panel: fix spinlock trylock failure on UP
From: Fengguang Wu
Date: Sun Sep 09 2012 - 04:23:52 EST
Use spin_lock_irq() to quiet warning:
[ 8.232324] BUG: spinlock trylock failure on UP on CPU#0, reboot/85
[ 8.234138] lock: c161c760, .magic: dead4ead, .owner: reboot/85, .owner_cpu: 0
[ 8.236132] Pid: 85, comm: reboot Not tainted 3.4.0-rc7-00656-g82163ed #5
[ 8.237965] Call Trace:
[ 8.238648] [<c13dfd20>] ? printk+0x18/0x1a
[ 8.239827] [<c122a5e0>] spin_dump+0x80/0xd0
[ 8.241016] [<c122a652>] spin_bug+0x22/0x30
[ 8.242181] [<c122a93b>] do_raw_spin_trylock+0x5b/0x70
[ 8.243611] [<c13e8bae>] _raw_spin_trylock+0xe/0x60
[ 8.244975] [<c1392230>] ? keypad_send_key.constprop.9+0xe0/0xe0
==> [ 8.246638] [<c13922ea>] panel_scan_timer+0xba/0x570
[ 8.248019] [<c1392230>] ? keypad_send_key.constprop.9+0xe0/0xe0
[ 8.249689] [<c102f6f5>] run_timer_softirq+0x1e5/0x370
[ 8.251191] [<c102f645>] ? run_timer_softirq+0x135/0x370
[ 8.252718] [<c1392230>] ? keypad_send_key.constprop.9+0xe0/0xe0
[ 8.254462] [<c102a592>] __do_softirq+0xc2/0x1c0
[ 8.255758] [<c102a4d0>] ? local_bh_enable_ip+0x130/0x130
[ 8.257228] <IRQ> [<c102a855>] ? irq_exit+0x65/0x70
[ 8.258647] [<c1013ff9>] ? smp_apic_timer_interrupt+0x49/0x80
[ 8.260226] [<c13e96c1>] ? apic_timer_interrupt+0x31/0x38
[ 8.261737] [<c12700e0>] ? drm_vm_open_locked+0x70/0xb0
[ 8.263166] [<c122489a>] ? delay_tsc+0x1a/0x30
[ 8.264452] [<c12248c9>] ? __delay+0x9/0x10
[ 8.265621] [<c12248ec>] ? __const_udelay+0x1c/0x20
==> [ 8.266967] [<c139136c>] ? lcd_clear_fast_p8+0x9c/0xe0
[ 8.268386] [<c1391a66>] ? lcd_write+0x226/0x810
[ 8.269653] [<c1367900>] ? md_set_readonly+0xc0/0xc0
[ 8.271013] [<c122a9ed>] ? do_raw_spin_unlock+0x9d/0xe0
[ 8.272470] [<c1392a98>] ? panel_lcd_print+0x38/0x40
[ 8.273837] [<c1392ace>] ? panel_notify_sys+0x2e/0x60
[ 8.275224] [<c1046634>] ? notifier_call_chain+0x84/0xb0
[ 8.276754] [<c10469ce>] ? __blocking_notifier_call_chain+0x3e/0x60
[ 8.278576] [<c1046a0a>] ? blocking_notifier_call_chain+0x1a/0x20
[ 8.280267] [<c1036a14>] ? kernel_restart_prepare+0x14/0x40
[ 8.281901] [<c1036a8e>] ? kernel_restart+0xe/0x50
[ 8.283216] [<c1036ce9>] ? sys_reboot+0x149/0x1e0
[ 8.284532] [<c10b3fb3>] ? handle_pte_fault+0x93/0xd70
[ 8.285956] [<c1019e35>] ? do_page_fault+0x215/0x5e0
[ 8.287330] [<c101a113>] ? do_page_fault+0x4f3/0x5e0
[ 8.288704] [<c1045ac6>] ? up_read+0x16/0x30
[ 8.289890] [<c101a113>] ? do_page_fault+0x4f3/0x5e0
[ 8.291252] [<c10d4486>] ? iterate_supers+0x86/0xd0
[ 8.292615] [<c122a9ed>] ? do_raw_spin_unlock+0x9d/0xe0
[ 8.294049] [<c13e8dcd>] ? _raw_spin_unlock+0x1d/0x20
[ 8.295449] [<c10d44ab>] ? iterate_supers+0xab/0xd0
[ 8.296795] [<c10fb620>] ? __sync_filesystem+0xa0/0xa0
[ 8.298199] [<c13e9b03>] ? sysenter_do_call+0x12/0x37
[ 8.306899] Restarting system.
[ 8.307747] machine restart
Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
---
drivers/staging/panel/panel.c | 44 ++++++++++++++++----------------
1 file changed, 22 insertions(+), 22 deletions(-)
--- linux.orig/drivers/staging/panel/panel.c 2012-09-09 09:55:49.534161723 +0800
+++ linux/drivers/staging/panel/panel.c 2012-09-09 16:19:56.509417982 +0800
@@ -757,38 +757,38 @@ static void lcd_backlight(int on)
return;
/* The backlight is activated by setting the AUTOFEED line to +5V */
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
bits.bl = on;
panel_set_bits();
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
}
/* send a command to the LCD panel in serial mode */
static void lcd_write_cmd_s(int cmd)
{
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
lcd_send_serial(0x1F); /* R/W=W, RS=0 */
lcd_send_serial(cmd & 0x0F);
lcd_send_serial((cmd >> 4) & 0x0F);
udelay(40); /* the shortest command takes at least 40 us */
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
}
/* send data to the LCD panel in serial mode */
static void lcd_write_data_s(int data)
{
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
lcd_send_serial(0x5F); /* R/W=W, RS=1 */
lcd_send_serial(data & 0x0F);
lcd_send_serial((data >> 4) & 0x0F);
udelay(40); /* the shortest data takes at least 40 us */
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
}
/* send a command to the LCD panel in 8 bits parallel mode */
static void lcd_write_cmd_p8(int cmd)
{
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
/* present the data to the data port */
w_dtr(pprt, cmd);
udelay(20); /* maintain the data during 20 us before the strobe */
@@ -804,13 +804,13 @@ static void lcd_write_cmd_p8(int cmd)
set_ctrl_bits();
udelay(120); /* the shortest command takes at least 120 us */
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
}
/* send data to the LCD panel in 8 bits parallel mode */
static void lcd_write_data_p8(int data)
{
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
/* present the data to the data port */
w_dtr(pprt, data);
udelay(20); /* maintain the data during 20 us before the strobe */
@@ -826,27 +826,27 @@ static void lcd_write_data_p8(int data)
set_ctrl_bits();
udelay(45); /* the shortest data takes at least 45 us */
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
}
/* send a command to the TI LCD panel */
static void lcd_write_cmd_tilcd(int cmd)
{
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
/* present the data to the control port */
w_ctr(pprt, cmd);
udelay(60);
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
}
/* send data to the TI LCD panel */
static void lcd_write_data_tilcd(int data)
{
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
/* present the data to the data port */
w_dtr(pprt, data);
udelay(60);
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
}
static void lcd_gotoxy(void)
@@ -879,14 +879,14 @@ static void lcd_clear_fast_s(void)
lcd_addr_x = lcd_addr_y = 0;
lcd_gotoxy();
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) {
lcd_send_serial(0x5F); /* R/W=W, RS=1 */
lcd_send_serial(' ' & 0x0F);
lcd_send_serial((' ' >> 4) & 0x0F);
udelay(40); /* the shortest data takes at least 40 us */
}
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
lcd_addr_x = lcd_addr_y = 0;
lcd_gotoxy();
@@ -899,7 +899,7 @@ static void lcd_clear_fast_p8(void)
lcd_addr_x = lcd_addr_y = 0;
lcd_gotoxy();
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) {
/* present the data to the data port */
w_dtr(pprt, ' ');
@@ -921,7 +921,7 @@ static void lcd_clear_fast_p8(void)
/* the shortest data takes at least 45 us */
udelay(45);
}
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
lcd_addr_x = lcd_addr_y = 0;
lcd_gotoxy();
@@ -934,14 +934,14 @@ static void lcd_clear_fast_tilcd(void)
lcd_addr_x = lcd_addr_y = 0;
lcd_gotoxy();
- spin_lock(&pprt_lock);
+ spin_lock_irq(&pprt_lock);
for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) {
/* present the data to the data port */
w_dtr(pprt, ' ');
udelay(60);
}
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
lcd_addr_x = lcd_addr_y = 0;
lcd_gotoxy();
@@ -1886,11 +1886,11 @@ static void panel_process_inputs(void)
static void panel_scan_timer(void)
{
if (keypad_enabled && keypad_initialized) {
- if (spin_trylock(&pprt_lock)) {
+ if (spin_trylock_irq(&pprt_lock)) {
phys_scan_contacts();
/* no need for the parport anymore */
- spin_unlock(&pprt_lock);
+ spin_unlock_irq(&pprt_lock);
}
if (!inputs_stable || phys_curr != phys_prev)
--
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