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Date: Fri, 18 Apr 2008 19:22:51 -0400 (EDT)
From: Jeff Garzik <jeff@...zik.org>
To: alan@...hat.com, R.E.Wolff@...Wizard.nl
CC: Andrew Morton <akpm@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 05/15] drivers/char: minor irq handler cleanups
- remove always-false tests
- don't overload 'irq' argument, pass data properly via dev_id
- remove pointless casts from void*
- make polled uses of irq handling (where code calls irq handler
directly) more plain, by splitting polled and non-polled irq handling
work. This quite often results in a more-efficient irq handler.
This change's main purpose is to prepare for the patchset in
jgarzik/misc-2.6.git#irq-remove, that explores removal of the
never-used 'irq' argument in each interrupt handler.
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
---
drivers/char/cyclades.c | 17 +----------------
drivers/char/mwave/tp3780i.c | 14 ++++++++++----
drivers/char/pcmcia/synclink_cs.c | 10 ++++------
drivers/char/rio/rio_linux.c | 23 +++++++++++++----------
drivers/char/specialix.c | 10 ++++------
drivers/char/stallion.c | 2 +-
drivers/char/sx.c | 22 ++++++++++++++--------
drivers/char/synclink.c | 21 +++++++++------------
drivers/char/synclink_gt.c | 13 ++++---------
drivers/char/synclinkmp.c | 22 +++++++++-------------
drivers/char/tpm/tpm_tis.c | 2 +-
11 files changed, 70 insertions(+), 86 deletions(-)
diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index e4f579c..823e169 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -1318,13 +1318,6 @@ static irqreturn_t cyy_interrupt(int irq, void *dev_id)
unsigned int chip, too_many, had_work;
int index;
- if (unlikely(cinfo == NULL)) {
-#ifdef CY_DEBUG_INTERRUPTS
- printk(KERN_DEBUG "cyy_interrupt: spurious interrupt %d\n",irq);
-#endif
- return IRQ_NONE; /* spurious interrupt */
- }
-
card_base_addr = cinfo->base_addr;
index = cinfo->bus_index;
@@ -1730,17 +1723,9 @@ static irqreturn_t cyz_interrupt(int irq, void *dev_id)
{
struct cyclades_card *cinfo = dev_id;
- if (unlikely(cinfo == NULL)) {
-#ifdef CY_DEBUG_INTERRUPTS
- printk(KERN_DEBUG "cyz_interrupt: spurious interrupt %d\n",irq);
-#endif
- return IRQ_NONE; /* spurious interrupt */
- }
-
if (unlikely(!ISZLOADED(*cinfo))) {
#ifdef CY_DEBUG_INTERRUPTS
- printk(KERN_DEBUG "cyz_interrupt: board not yet loaded "
- "(IRQ%d).\n", irq);
+ printk(KERN_DEBUG "cyz_interrupt: board not yet loaded\n");
#endif
return IRQ_NONE;
}
diff --git a/drivers/char/mwave/tp3780i.c b/drivers/char/mwave/tp3780i.c
index f282976..37fe80d 100644
--- a/drivers/char/mwave/tp3780i.c
+++ b/drivers/char/mwave/tp3780i.c
@@ -97,20 +97,24 @@ static void EnableSRAM(THINKPAD_BD_DATA * pBDData)
static irqreturn_t UartInterrupt(int irq, void *dev_id)
{
+ int irqno = (int)(unsigned long) dev_id;
+
PRINTK_3(TRACE_TP3780I,
- "tp3780i::UartInterrupt entry irq %x dev_id %p\n", irq, dev_id);
+ "tp3780i::UartInterrupt entry irq %x dev_id %p\n", irqno, dev_id);
return IRQ_HANDLED;
}
static irqreturn_t DspInterrupt(int irq, void *dev_id)
{
+ int irqno = (int)(unsigned long) dev_id;
+
pMWAVE_DEVICE_DATA pDrvData = &mwave_s_mdd;
DSP_3780I_CONFIG_SETTINGS *pSettings = &pDrvData->rBDData.rDspSettings;
unsigned short usDspBaseIO = pSettings->usDspBaseIO;
unsigned short usIPCSource = 0, usIsolationMask, usPCNum;
PRINTK_3(TRACE_TP3780I,
- "tp3780i::DspInterrupt entry irq %x dev_id %p\n", irq, dev_id);
+ "tp3780i::DspInterrupt entry irq %x dev_id %p\n", irqno, dev_id);
if (dsp3780I_GetIPCSource(usDspBaseIO, &usIPCSource) == 0) {
PRINTK_2(TRACE_TP3780I,
@@ -361,14 +365,16 @@ int tp3780I_EnableDSP(THINKPAD_BD_DATA * pBDData)
pSettings->bPllBypass = TP_CFG_PllBypass;
pSettings->usChipletEnable = TP_CFG_ChipletEnable;
- if (request_irq(pSettings->usUartIrq, &UartInterrupt, 0, "mwave_uart", NULL)) {
+ if (request_irq(pSettings->usUartIrq, &UartInterrupt, 0, "mwave_uart",
+ (void *)(unsigned long) pSettings->usUartIrq)) {
PRINTK_ERROR(KERN_ERR_MWAVE "tp3780i::tp3780I_EnableDSP: Error: Could not get UART IRQ %x\n", pSettings->usUartIrq);
goto exit_cleanup;
} else { /* no conflict just release */
free_irq(pSettings->usUartIrq, NULL);
}
- if (request_irq(pSettings->usDspIrq, &DspInterrupt, 0, "mwave_3780i", NULL)) {
+ if (request_irq(pSettings->usDspIrq, &DspInterrupt, 0, "mwave_3780i",
+ (void *)(unsigned long) pSettings->usDspIrq)) {
PRINTK_ERROR("tp3780i::tp3780I_EnableDSP: Error: Could not get 3780i IRQ %x\n", pSettings->usDspIrq);
goto exit_cleanup;
} else {
diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index 279ff50..4e84d23 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -1225,17 +1225,15 @@ static void ri_change(MGSLPC_INFO *info)
* irq interrupt number that caused interrupt
* dev_id device ID supplied during interrupt registration
*/
-static irqreturn_t mgslpc_isr(int irq, void *dev_id)
+static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
{
- MGSLPC_INFO * info = (MGSLPC_INFO *)dev_id;
+ MGSLPC_INFO *info = dev_id;
unsigned short isr;
unsigned char gis, pis;
int count=0;
if (debug_level >= DEBUG_LEVEL_ISR)
- printk("mgslpc_isr(%d) entry.\n", irq);
- if (!info)
- return IRQ_NONE;
+ printk("mgslpc_isr(%d) entry.\n", info->irq_level);
if (!(info->p_dev->_locked))
return IRQ_HANDLED;
@@ -1327,7 +1325,7 @@ static irqreturn_t mgslpc_isr(int irq, void *dev_id)
if (debug_level >= DEBUG_LEVEL_ISR)
printk("%s(%d):mgslpc_isr(%d)exit.\n",
- __FILE__,__LINE__,irq);
+ __FILE__, __LINE__, info->irq_level);
return IRQ_HANDLED;
}
diff --git a/drivers/char/rio/rio_linux.c b/drivers/char/rio/rio_linux.c
index 0ce9667..fb06665 100644
--- a/drivers/char/rio/rio_linux.c
+++ b/drivers/char/rio/rio_linux.c
@@ -362,14 +362,11 @@ static void rio_reset_interrupt(struct Host *HostP)
func_exit();
}
-
-static irqreturn_t rio_interrupt(int irq, void *ptr)
+static irqreturn_t __rio_interrupt(struct Host *HostP, bool polled)
{
- struct Host *HostP;
func_enter();
- HostP = ptr; /* &p->RIOHosts[(long)ptr]; */
- rio_dprintk(RIO_DEBUG_IFLOW, "rio: enter rio_interrupt (%d/%d)\n", irq, HostP->Ivec);
+ rio_dprintk(RIO_DEBUG_IFLOW, "rio: enter rio_interrupt (%d)\n", HostP->Ivec);
/* AAargh! The order in which to do these things is essential and
not trivial.
@@ -389,7 +386,7 @@ static irqreturn_t rio_interrupt(int irq, void *ptr)
*/
rio_dprintk(RIO_DEBUG_IFLOW, "rio: We've have noticed the interrupt\n");
- if (HostP->Ivec == irq) {
+ if (!polled) {
/* Tell the card we've noticed the interrupt. */
rio_reset_interrupt(HostP);
}
@@ -398,26 +395,32 @@ static irqreturn_t rio_interrupt(int irq, void *ptr)
return IRQ_HANDLED;
if (test_and_set_bit(RIO_BOARD_INTR_LOCK, &HostP->locks)) {
- printk(KERN_ERR "Recursive interrupt! (host %p/irq%d)\n", ptr, HostP->Ivec);
+ printk(KERN_ERR "Recursive interrupt! (host %p/irq%d)\n",
+ HostP, HostP->Ivec);
return IRQ_HANDLED;
}
RIOServiceHost(p, HostP);
- rio_dprintk(RIO_DEBUG_IFLOW, "riointr() doing host %p type %d\n", ptr, HostP->Type);
+ rio_dprintk(RIO_DEBUG_IFLOW, "riointr() doing host %p type %d\n",
+ HostP, HostP->Type);
clear_bit(RIO_BOARD_INTR_LOCK, &HostP->locks);
- rio_dprintk(RIO_DEBUG_IFLOW, "rio: exit rio_interrupt (%d/%d)\n", irq, HostP->Ivec);
+ rio_dprintk(RIO_DEBUG_IFLOW, "rio: exit rio_interrupt (%d)\n", HostP->Ivec);
func_exit();
return IRQ_HANDLED;
}
+static irqreturn_t rio_interrupt(int dummy, void *ptr)
+{
+ return __rio_interrupt(ptr, false);
+}
static void rio_pollfunc(unsigned long data)
{
func_enter();
- rio_interrupt(0, &p->RIOHosts[data]);
+ __rio_interrupt(&p->RIOHosts[data], true);
mod_timer(&p->RIOHosts[data].timer, jiffies + rio_poll);
func_exit();
diff --git a/drivers/char/specialix.c b/drivers/char/specialix.c
index 5ff83df..4b5b5b7 100644
--- a/drivers/char/specialix.c
+++ b/drivers/char/specialix.c
@@ -443,8 +443,7 @@ void missed_irq (unsigned long data)
spin_unlock_irqrestore(&bp->lock, flags);
if (irq) {
printk (KERN_INFO "Missed interrupt... Calling int from timer. \n");
- sx_interrupt (((struct specialix_board *)data)->irq,
- (void*)data);
+ sx_interrupt (-1, bp);
}
mod_timer(&missed_irq_timer, jiffies + sx_poll);
}
@@ -862,23 +861,22 @@ static inline void sx_check_modem(struct specialix_board * bp)
/* The main interrupt processing routine */
-static irqreturn_t sx_interrupt(int irq, void *dev_id)
+static irqreturn_t sx_interrupt(int dummy, void *dev_id)
{
unsigned char status;
unsigned char ack;
- struct specialix_board *bp;
+ struct specialix_board *bp = dev_id;
unsigned long loop = 0;
int saved_reg;
unsigned long flags;
func_enter();
- bp = dev_id;
spin_lock_irqsave(&bp->lock, flags);
dprintk (SX_DEBUG_FLOW, "enter %s port %d room: %ld\n", __FUNCTION__, port_No(sx_get_port(bp, "INT")), SERIAL_XMIT_SIZE - sx_get_port(bp, "ITN")->xmit_cnt - 1);
if (!(bp->flags & SX_BOARD_ACTIVE)) {
- dprintk (SX_DEBUG_IRQ, "sx: False interrupt. irq %d.\n", irq);
+ dprintk (SX_DEBUG_IRQ, "sx: False interrupt. irq %d.\n", bp->irq);
spin_unlock_irqrestore(&bp->lock, flags);
func_exit();
return IRQ_NONE;
diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index feac54e..874aaa0 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -1645,7 +1645,7 @@ static irqreturn_t stl_intr(int irq, void *dev_id)
{
struct stlbrd *brdp = dev_id;
- pr_debug("stl_intr(brdp=%p,irq=%d)\n", brdp, irq);
+ pr_debug("stl_intr(brdp=%p,irq=%d)\n", brdp, brdp->irq);
return IRQ_RETVAL((* brdp->isr)(brdp));
}
diff --git a/drivers/char/sx.c b/drivers/char/sx.c
index a6e1c9b..ae9e973 100644
--- a/drivers/char/sx.c
+++ b/drivers/char/sx.c
@@ -1241,15 +1241,13 @@ static inline void sx_check_modem_signals(struct sx_port *port)
* Small, elegant, clear.
*/
-static irqreturn_t sx_interrupt(int irq, void *ptr)
+static irqreturn_t __sx_interrupt(struct sx_board *board, bool polled)
{
- struct sx_board *board = ptr;
struct sx_port *port;
int i;
func_enter();
- sx_dprintk(SX_DEBUG_FLOW, "sx: enter sx_interrupt (%d/%d)\n", irq,
- board->irq);
+ sx_dprintk(SX_DEBUG_FLOW, "sx: enter sx_interrupt (%d)\n", board->irq);
/* AAargh! The order in which to do these things is essential and
not trivial.
@@ -1281,6 +1279,10 @@ static irqreturn_t sx_interrupt(int irq, void *ptr)
if (lastjif == jiffies) {
if (++nintr > IRQ_RATE_LIMIT) {
+ /*
+ * FIXME: free_irq() inside irq handler
+ * is unwise
+ */
free_irq(board->irq, board);
printk(KERN_ERR "sx: Too many interrupts. "
"Turning off interrupt %d.\n",
@@ -1293,7 +1295,7 @@ static irqreturn_t sx_interrupt(int irq, void *ptr)
}
#endif
- if (board->irq == irq) {
+ if (!polled) {
/* Tell the card we've noticed the interrupt. */
sx_write_board_word(board, cc_int_pending, 0);
@@ -1339,19 +1341,23 @@ static irqreturn_t sx_interrupt(int irq, void *ptr)
clear_bit(SX_BOARD_INTR_LOCK, &board->locks);
- sx_dprintk(SX_DEBUG_FLOW, "sx: exit sx_interrupt (%d/%d)\n", irq,
- board->irq);
+ sx_dprintk(SX_DEBUG_FLOW, "sx: exit sx_interrupt (%d)\n", board->irq);
func_exit();
return IRQ_HANDLED;
}
+static irqreturn_t sx_interrupt(int dummy, void *data)
+{
+ return __sx_interrupt(data, false);
+}
+
static void sx_pollfunc(unsigned long data)
{
struct sx_board *board = (struct sx_board *)data;
func_enter();
- sx_interrupt(0, board);
+ __sx_interrupt(board, true);
mod_timer(&board->timer, jiffies + sx_poll);
func_exit();
diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index ddc74d1..a3237d4 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -1695,20 +1695,16 @@ static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
*
* Return Value: None
*/
-static irqreturn_t mgsl_interrupt(int irq, void *dev_id)
+static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
{
- struct mgsl_struct * info;
+ struct mgsl_struct *info = dev_id;
u16 UscVector;
u16 DmaVector;
if ( debug_level >= DEBUG_LEVEL_ISR )
- printk("%s(%d):mgsl_interrupt(%d)entry.\n",
- __FILE__,__LINE__,irq);
+ printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
+ __FILE__, __LINE__, info->irq_level);
- info = (struct mgsl_struct *)dev_id;
- if (!info)
- return IRQ_NONE;
-
spin_lock(&info->irq_spinlock);
for(;;) {
@@ -1732,8 +1728,8 @@ static irqreturn_t mgsl_interrupt(int irq, void *dev_id)
mgsl_isr_receive_dma(info);
if ( info->isr_overflow ) {
- printk(KERN_ERR"%s(%d):%s isr overflow irq=%d\n",
- __FILE__,__LINE__,info->device_name, irq);
+ printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
+ __FILE__, __LINE__, info->device_name, info->irq_level);
usc_DisableMasterIrqBit(info);
usc_DisableDmaInterrupts(info,DICR_MASTER);
break;
@@ -1755,8 +1751,9 @@ static irqreturn_t mgsl_interrupt(int irq, void *dev_id)
spin_unlock(&info->irq_spinlock);
if ( debug_level >= DEBUG_LEVEL_ISR )
- printk("%s(%d):mgsl_interrupt(%d)exit.\n",
- __FILE__,__LINE__,irq);
+ printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
+ __FILE__, __LINE__, info->irq_level);
+
return IRQ_HANDLED;
} /* end of mgsl_interrupt() */
diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 1f954ac..3c89266 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -491,7 +491,6 @@ static void isr_serial(struct slgt_info *info);
static void isr_rdma(struct slgt_info *info);
static void isr_txeom(struct slgt_info *info, unsigned short status);
static void isr_tdma(struct slgt_info *info);
-static irqreturn_t slgt_interrupt(int irq, void *dev_id);
static int alloc_dma_bufs(struct slgt_info *info);
static void free_dma_bufs(struct slgt_info *info);
@@ -2326,17 +2325,13 @@ static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int
* irq interrupt number
* dev_id device ID supplied during interrupt registration
*/
-static irqreturn_t slgt_interrupt(int irq, void *dev_id)
+static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
{
- struct slgt_info *info;
+ struct slgt_info *info = dev_id;
unsigned int gsr;
unsigned int i;
- DBGISR(("slgt_interrupt irq=%d entry\n", irq));
-
- info = dev_id;
- if (!info)
- return IRQ_NONE;
+ DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
spin_lock(&info->lock);
@@ -2385,7 +2380,7 @@ static irqreturn_t slgt_interrupt(int irq, void *dev_id)
spin_unlock(&info->lock);
- DBGISR(("slgt_interrupt irq=%d exit\n", irq));
+ DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
return IRQ_HANDLED;
}
diff --git a/drivers/char/synclinkmp.c b/drivers/char/synclinkmp.c
index f3e7807..c96062e 100644
--- a/drivers/char/synclinkmp.c
+++ b/drivers/char/synclinkmp.c
@@ -2586,9 +2586,9 @@ void isr_io_pin( SLMP_INFO *info, u16 status )
* dev_id device ID supplied during interrupt registration
* regs interrupted processor context
*/
-static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id)
+static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
{
- SLMP_INFO * info;
+ SLMP_INFO *info = dev_id;
unsigned char status, status0, status1=0;
unsigned char dmastatus, dmastatus0, dmastatus1=0;
unsigned char timerstatus0, timerstatus1=0;
@@ -2597,12 +2597,8 @@ static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id)
unsigned short tmp;
if ( debug_level >= DEBUG_LEVEL_ISR )
- printk("%s(%d): synclinkmp_interrupt(%d)entry.\n",
- __FILE__,__LINE__,irq);
-
- info = (SLMP_INFO *)dev_id;
- if (!info)
- return IRQ_NONE;
+ printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
+ __FILE__, __LINE__, info->irq_level);
spin_lock(&info->lock);
@@ -2615,9 +2611,9 @@ static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id)
timerstatus0 = read_reg(info, ISR2);
if ( debug_level >= DEBUG_LEVEL_ISR )
- printk("%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
- __FILE__,__LINE__,info->device_name,
- status0,dmastatus0,timerstatus0);
+ printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
+ __FILE__, __LINE__, info->device_name,
+ status0, dmastatus0, timerstatus0);
if (info->port_count == 4) {
/* get status for SCA1 (ports 2-3) */
@@ -2702,8 +2698,8 @@ static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id)
spin_unlock(&info->lock);
if ( debug_level >= DEBUG_LEVEL_ISR )
- printk("%s(%d):synclinkmp_interrupt(%d)exit.\n",
- __FILE__,__LINE__,irq);
+ printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
+ __FILE__, __LINE__, info->irq_level);
return IRQ_HANDLED;
}
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 81503d9..13a4bdd 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -399,7 +399,7 @@ static irqreturn_t tis_int_probe(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static irqreturn_t tis_int_handler(int irq, void *dev_id)
+static irqreturn_t tis_int_handler(int dummy, void *dev_id)
{
struct tpm_chip *chip = dev_id;
u32 interrupt;
--
1.5.4.1
--
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