From 4b0ff3dc5e3d86ada66afcaab46a766d326facd4 Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Mon, 1 Sep 2014 12:03:53 +0100 Subject: [PATCH] staging: comedi: amplc_pci230: replace `state` member with bitfields The `state` member of `struct pci230_private` is used with the atomic bit-op functions and has a couple of bits defined, `AI_CMD_STARTED` and `AO_CMD_STARTED`. Spin-locks are used to protect the clearing of these bits and other stuff. No special protection is used for setting these bits. Replace the `state` member with a couple of new, single-bit bitfield members, `ai_cmd_started` and `ao_cmd_started` to save some space. Signed-off-by: Ian Abbott Reviewed-by: H Hartley Sweeten Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/amplc_pci230.c | 27 +++++++++---------- 1 file changed, 13 insertions(+), 14 deletions(-) diff --git a/drivers/staging/comedi/drivers/amplc_pci230.c b/drivers/staging/comedi/drivers/amplc_pci230.c index 29e6016e7444..7a8291adecea 100644 --- a/drivers/staging/comedi/drivers/amplc_pci230.c +++ b/drivers/staging/comedi/drivers/amplc_pci230.c @@ -443,10 +443,6 @@ enum { /* Current CPU. XXX should this be hard_smp_processor_id()? */ #define THISCPU smp_processor_id() -/* State flags for atomic bit operations */ -#define AI_CMD_STARTED 0 -#define AO_CMD_STARTED 1 - /* * Board descriptions for the two boards supported. */ @@ -495,7 +491,6 @@ struct pci230_private { spinlock_t ai_stop_spinlock; /* Spin lock for stopping AI command */ spinlock_t ao_stop_spinlock; /* Spin lock for stopping AO command */ unsigned long daqio; /* PCI230's DAQ I/O space */ - unsigned long state; /* State flags */ unsigned int ai_scan_count; /* Number of AI scans remaining */ unsigned int ai_scan_pos; /* Current position within AI scan */ unsigned int ao_scan_count; /* Number of AO scans remaining. */ @@ -511,6 +506,8 @@ struct pci230_private { bool intr_running:1; /* Flag set in interrupt routine */ bool ai_bipolar:1; /* Flag AI range is bipolar */ bool ao_bipolar:1; /* Flag AO range is bipolar */ + bool ai_cmd_started:1; /* Flag AI command started */ + bool ao_cmd_started:1; /* Flag AO command started */ }; /* PCI230 clock source periods in ns */ @@ -1060,11 +1057,12 @@ static void pci230_ao_stop(struct comedi_device *dev, struct pci230_private *devpriv = dev->private; unsigned long irqflags; unsigned char intsrc; - int started; + bool started; struct comedi_cmd *cmd; spin_lock_irqsave(&devpriv->ao_stop_spinlock, irqflags); - started = test_and_clear_bit(AO_CMD_STARTED, &devpriv->state); + started = devpriv->ao_cmd_started; + devpriv->ao_cmd_started = false; spin_unlock_irqrestore(&devpriv->ao_stop_spinlock, irqflags); if (!started) return; @@ -1263,7 +1261,7 @@ static int pci230_ao_inttrig_scan_begin(struct comedi_device *dev, return -EINVAL; spin_lock_irqsave(&devpriv->ao_stop_spinlock, irqflags); - if (test_bit(AO_CMD_STARTED, &devpriv->state)) { + if (devpriv->ao_cmd_started) { /* Perform scan. */ if (devpriv->hwver < 2) { /* Not using DAC FIFO. */ @@ -1296,7 +1294,7 @@ static void pci230_ao_start(struct comedi_device *dev, struct comedi_cmd *cmd = &async->cmd; unsigned long irqflags; - set_bit(AO_CMD_STARTED, &devpriv->state); + devpriv->ao_cmd_started = true; if (cmd->stop_src == TRIG_COUNT && devpriv->ao_scan_count == 0) { /* An empty acquisition! */ async->events |= COMEDI_CB_EOA; @@ -1852,7 +1850,7 @@ static int pci230_ai_inttrig_convert(struct comedi_device *dev, return -EINVAL; spin_lock_irqsave(&devpriv->ai_stop_spinlock, irqflags); - if (test_bit(AI_CMD_STARTED, &devpriv->state)) { + if (devpriv->ai_cmd_started) { unsigned int delayus; /* @@ -1899,7 +1897,7 @@ static int pci230_ai_inttrig_scan_begin(struct comedi_device *dev, return -EINVAL; spin_lock_irqsave(&devpriv->ai_stop_spinlock, irqflags); - if (test_bit(AI_CMD_STARTED, &devpriv->state)) { + if (devpriv->ai_cmd_started) { /* Trigger scan by waggling CT0 gate source. */ zgat = GAT_CONFIG(0, GAT_GND); outb(zgat, dev->iobase + PCI230_ZGAT_SCE); @@ -1917,10 +1915,11 @@ static void pci230_ai_stop(struct comedi_device *dev, struct pci230_private *devpriv = dev->private; unsigned long irqflags; struct comedi_cmd *cmd; - int started; + bool started; spin_lock_irqsave(&devpriv->ai_stop_spinlock, irqflags); - started = test_and_clear_bit(AI_CMD_STARTED, &devpriv->state); + started = devpriv->ai_cmd_started; + devpriv->ai_cmd_started = false; spin_unlock_irqrestore(&devpriv->ai_stop_spinlock, irqflags); if (!started) return; @@ -1970,7 +1969,7 @@ static void pci230_ai_start(struct comedi_device *dev, struct comedi_async *async = s->async; struct comedi_cmd *cmd = &async->cmd; - set_bit(AI_CMD_STARTED, &devpriv->state); + devpriv->ai_cmd_started = true; if (cmd->stop_src == TRIG_COUNT && devpriv->ai_scan_count == 0) { /* An empty acquisition! */ async->events |= COMEDI_CB_EOA; -- 2.30.2