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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2011-09-09 09:24:20 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2011-09-09 09:25:50 -0700
commit95439cbad134de58d9ea256e37fd13fbcdc87d08 (patch)
tree258e1670f91558404c94fe07d062166cc88fc9f1
parentd0d150ec28ab05eb2ec8cf9fcb7c9753ec95e0d4 (diff)
Input: tegra-kbc - tighten locking
Take spinlock when entering ISR and timer routine to ensure that we do not race while enabling/disabling FIFO interrupts. Also we do not need to take teh spinlock in tegra_kbc_startremove() since interrupt is completely disabled. Tested-by: Rakesh Iyer <riyer@nvidia.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
-rw-r--r--drivers/input/keyboard/tegra-kbc.c31
1 files changed, 12 insertions, 19 deletions
diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index 8fb474f03940..cf3228b0ab90 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -260,12 +260,10 @@ static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
u32 val = 0;
unsigned int i;
unsigned int num_down = 0;
- unsigned long flags;
bool fn_keypress = false;
bool key_in_same_row = false;
bool key_in_same_col = false;
- spin_lock_irqsave(&kbc->lock, flags);
for (i = 0; i < KBC_MAX_KPENT; i++) {
if ((i % 4) == 0)
val = readl(kbc->mmio + KBC_KP_ENT0_0 + i);
@@ -294,7 +292,7 @@ static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
* any 2 of the 3 keys share a row, and any 2 of them share a column.
* If so ignore the key presses for this iteration.
*/
- if ((kbc->use_ghost_filter) && (num_down >= 3)) {
+ if (kbc->use_ghost_filter && num_down >= 3) {
for (i = 0; i < num_down; i++) {
unsigned int j;
u8 curr_col = scancodes[i] & 0x07;
@@ -327,8 +325,6 @@ static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
}
}
- spin_unlock_irqrestore(&kbc->lock, flags);
-
/* Ignore the key presses for this iteration? */
if (key_in_same_col && key_in_same_row)
return;
@@ -362,6 +358,8 @@ static void tegra_kbc_keypress_timer(unsigned long data)
u32 val;
unsigned int i;
+ spin_lock_irqsave(&kbc->lock, flags);
+
val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf;
if (val) {
unsigned long dly;
@@ -383,22 +381,19 @@ static void tegra_kbc_keypress_timer(unsigned long data)
kbc->num_pressed_keys = 0;
/* All keys are released so enable the keypress interrupt */
- spin_lock_irqsave(&kbc->lock, flags);
tegra_kbc_set_fifo_interrupt(kbc, true);
- spin_unlock_irqrestore(&kbc->lock, flags);
}
+
+ spin_unlock_irqrestore(&kbc->lock, flags);
}
static irqreturn_t tegra_kbc_isr(int irq, void *args)
{
struct tegra_kbc *kbc = args;
+ unsigned long flags;
u32 val;
- /*
- * Until all keys are released, defer further processing to
- * the polling loop in tegra_kbc_keypress_timer
- */
- tegra_kbc_set_fifo_interrupt(kbc, false);
+ spin_lock_irqsave(&kbc->lock, flags);
/*
* Quickly bail out & reenable interrupts if the fifo threshold
@@ -409,14 +404,15 @@ static irqreturn_t tegra_kbc_isr(int irq, void *args)
if (val & KBC_INT_FIFO_CNT_INT_STATUS) {
/*
- * Schedule timer to run when hardware is in continuous
- * polling mode.
+ * Until all keys are released, defer further processing to
+ * the polling loop in tegra_kbc_keypress_timer.
*/
+ tegra_kbc_set_fifo_interrupt(kbc, false);
mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies);
- } else {
- tegra_kbc_set_fifo_interrupt(kbc, true);
}
+ spin_unlock_irqrestore(&kbc->lock, flags);
+
return IRQ_HANDLED;
}
@@ -464,7 +460,6 @@ static void tegra_kbc_config_pins(struct tegra_kbc *kbc)
static int tegra_kbc_start(struct tegra_kbc *kbc)
{
const struct tegra_kbc_platform_data *pdata = kbc->pdata;
- unsigned long flags;
unsigned int debounce_cnt;
u32 val = 0;
@@ -502,7 +497,6 @@ static int tegra_kbc_start(struct tegra_kbc *kbc)
* Atomically clear out any remaining entries in the key FIFO
* and enable keyboard interrupts.
*/
- spin_lock_irqsave(&kbc->lock, flags);
while (1) {
val = readl(kbc->mmio + KBC_INT_0);
val >>= 4;
@@ -513,7 +507,6 @@ static int tegra_kbc_start(struct tegra_kbc *kbc)
val = readl(kbc->mmio + KBC_KP_ENT1_0);
}
writel(0x7, kbc->mmio + KBC_INT_0);
- spin_unlock_irqrestore(&kbc->lock, flags);
enable_irq(kbc->irq);