arm/mach-integrator/time.c, mwave: revert portions of recent irq cleanups

The recent irq cleanups for arch/arm/mach-integrator/time.c and
drivers/char/mwave/tp3780i.c changed the request_irq() dev_id
parameter, but neglected to change the matching free_irq() parameter,
thus creating a bug upon irq de-registration.

Given that the impetus for the changes is not yet accepted upstream,
it is best to revert the irq cleanups.

Mostly.  A comment is added to time.c to reduce future confusion,
of type that led to my time.c cleanup in the first place.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

2 files changed, 8 insertions, 11 deletions

diff --git a/arch/arm/mach-integrator/time.c b/arch/arm/mach-integrator/time.c
index 5235f64f235b..8508a0db3eaf 100644
--- a/arch/arm/mach-integrator/time.c
+++ b/arch/arm/mach-integrator/time.c
@@ -124,8 +124,11 @@ static int rtc_probe(struct amba_device *dev, void *id)
 
         xtime.tv_sec = __raw_readl(rtc_base + RTC_DR);
 
+        /* note that 'dev' is merely used for irq disambiguation;
+         * it is not actually referenced in the irq handler
+         */
         ret = request_irq(dev->irq[0], arm_rtc_interrupt, IRQF_DISABLED,
-                          "rtc-pl030", NULL);
+                          "rtc-pl030", dev);
         if (ret)
                 goto map_out;
 
diff --git a/drivers/char/mwave/tp3780i.c b/drivers/char/mwave/tp3780i.c
index 37fe80df0b91..f282976daaac 100644
--- a/drivers/char/mwave/tp3780i.c
+++ b/drivers/char/mwave/tp3780i.c
@@ -97,24 +97,20 @@ 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", irqno, dev_id);
+                "tp3780i::UartInterrupt entry irq %x dev_id %p\n", irq, 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", irqno, dev_id);
+                "tp3780i::DspInterrupt entry irq %x dev_id %p\n", irq, dev_id);
 
         if (dsp3780I_GetIPCSource(usDspBaseIO, &usIPCSource) == 0) {
                 PRINTK_2(TRACE_TP3780I,
@@ -365,16 +361,14 @@ 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",
-                        (void *)(unsigned long) pSettings->usUartIrq)) {
+        if (request_irq(pSettings->usUartIrq, &UartInterrupt, 0, "mwave_uart", NULL)) {
                 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",
-                        (void *)(unsigned long) pSettings->usDspIrq)) {
+        if (request_irq(pSettings->usDspIrq, &DspInterrupt, 0, "mwave_3780i", NULL)) {
                 PRINTK_ERROR("tp3780i::tp3780I_EnableDSP: Error: Could not get 3780i IRQ %x\n", pSettings->usDspIrq);
                 goto exit_cleanup;
         } else {