mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-23 17:30:02 +00:00
Code Issues Releases Wiki Activity

[media] media: rc: nuvoton-cir: improve locking in both interrupt handlers

Browse source 
Extend the locking to protect more critical actions like register accesses
in the interrupt handlers.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Heiner Kallweit 2015-12-30 14:46:29 -02:00 committed by Mauro Carvalho Chehab
parent d42fd29769
commit e60c1e87c7
1 changed files with 12 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
drivers/media/rc/nuvoton-cir.c
View file

@ -727,7 +727,6 @@ static void nvt_handle_rx_fifo_overrun(struct nvt_dev *nvt)
/* copy data from hardware rx fifo into driver buffer */
static void nvt_get_rx_ir_data(struct nvt_dev *nvt)
{
unsigned long flags;
u8 fifocount, val;
unsigned int b_idx;
bool overrun = false;
@ -746,8 +745,6 @@ static void nvt_get_rx_ir_data(struct nvt_dev *nvt)
nvt_dbg("attempting to fetch %u bytes from hw rx fifo", fifocount);
spin_lock_irqsave(&nvt->nvt_lock, flags);
b_idx = nvt->pkts;
/* This should never happen, but lets check anyway... */
@ -769,8 +766,6 @@ static void nvt_get_rx_ir_data(struct nvt_dev *nvt)
if (overrun)
nvt_handle_rx_fifo_overrun(nvt);
spin_unlock_irqrestore(&nvt->nvt_lock, flags);
}
static void nvt_cir_log_irqs(u8 status, u8 iren)
@ -811,6 +806,8 @@ static irqreturn_t nvt_cir_isr(int irq, void *data)
nvt_dbg_verbose("%s firing", __func__);
spin_lock_irqsave(&nvt->nvt_lock, flags);
/*
* Get IR Status register contents. Write 1 to ack/clear
*
@ -831,6 +828,7 @@ static irqreturn_t nvt_cir_isr(int irq, void *data)
* status bit whether the related interrupt source is enabled
*/
if (!(status & iren)) {
spin_unlock_irqrestore(&nvt->nvt_lock, flags);
nvt_dbg_verbose("%s exiting, IRSTS 0x0", __func__);
return IRQ_NONE;
}
@ -852,16 +850,14 @@ static irqreturn_t nvt_cir_isr(int irq, void *data)
if (nvt_cir_tx_inactive(nvt))
nvt_get_rx_ir_data(nvt);
spin_lock_irqsave(&nvt->nvt_lock, flags);
cur_state = nvt->study_state;
spin_unlock_irqrestore(&nvt->nvt_lock, flags);
if (cur_state == ST_STUDY_NONE)
nvt_clear_cir_fifo(nvt);
}
spin_unlock_irqrestore(&nvt->nvt_lock, flags);
if (status & CIR_IRSTS_TE)
nvt_clear_tx_fifo(nvt);
@ -910,14 +906,18 @@ static irqreturn_t nvt_cir_wake_isr(int irq, void *data)
nvt_dbg_wake("%s firing", __func__);
spin_lock_irqsave(&nvt->nvt_lock, flags);
status = nvt_cir_wake_reg_read(nvt, CIR_WAKE_IRSTS);
iren = nvt_cir_wake_reg_read(nvt, CIR_WAKE_IREN);
/* IRQ may be shared with CIR, therefore check for each
* status bit whether the related interrupt source is enabled
*/
if (!(status & iren))
if (!(status & iren)) {
spin_unlock_irqrestore(&nvt->nvt_lock, flags);
return IRQ_NONE;
}
if (status & CIR_WAKE_IRSTS_IR_PENDING)
nvt_clear_cir_wake_fifo(nvt);
@ -933,11 +933,11 @@ static irqreturn_t nvt_cir_wake_isr(int irq, void *data)
}
nvt_cir_wake_reg_write(nvt, 0, CIR_WAKE_IREN);
spin_lock_irqsave(&nvt->nvt_lock, flags);
nvt->wake_state = ST_WAKE_FINISH;
spin_unlock_irqrestore(&nvt->nvt_lock, flags);
}
spin_unlock_irqrestore(&nvt->nvt_lock, flags);
nvt_dbg_wake("%s done", __func__);
return IRQ_HANDLED;
}