From 43387b571e96bdf96f8516fb1e2345106f68a77f Mon Sep 17 00:00:00 2001 From: Valentin Rothberg Date: Thu, 5 Mar 2015 15:23:08 +0100 Subject: [PATCH] genirq: Remove the deprecated 'IRQF_DISABLED' request_irq() flag entirely The IRQF_DISABLED flag is a NOOP and has been scheduled for removal since Linux v2.6.36 by commit bb143907384c ("genirq: Remove IRQF_DISABLED from core code"). According to commit 16b7a78c7a5b ("genirq: Run irq handlers with interrupts disabled"), running IRQ handlers with interrupts enabled can cause stack overflows when the interrupt line of the issuing device is still active. This patch ends the grace period for IRQF_DISABLED (i.e., SA_INTERRUPT in older versions of Linux) and removes the definition and all remaining usages of this flag. There's still a few non-functional references left in the kernel source: - The bigger hunk in Documentation/scsi/ncr53c8xx.txt is removed entirely as IRQF_DISABLED is gone now; the usage in older kernel versions (including the old SA_INTERRUPT flag) should be discouraged. The trouble of using IRQF_SHARED is a general problem and not specific to any driver. - I left the reference in Documentation/PCI/MSI-HOWTO.txt untouched since it has already been removed in linux-next. - All remaining references are changelogs that I suggest to keep. Signed-off-by: Valentin Rothberg Cc: Afzal Mohammed Cc: Arnd Bergmann Cc: Brian Norris Cc: Christoph Hellwig Cc: Dan Carpenter Cc: David Woodhouse Cc: Ewan Milne Cc: Eyal Perry Cc: Felipe Balbi Cc: Greg Kroah-Hartman Cc: H. Peter Anvin Cc: Hannes Reinecke Cc: Hongliang Tao Cc: Huacai Chen Cc: Jiri Kosina Cc: Jonathan Corbet Cc: Keerthy Cc: Laurent Pinchart Cc: Linus Torvalds Cc: Nishanth Menon Cc: Paul Bolle Cc: Peter Ujfalusi Cc: Peter Zijlstra Cc: Quentin Lambert Cc: Rajendra Nayak Cc: Ralf Baechle Cc: Santosh Shilimkar Cc: Sricharan R Cc: Thomas Gleixner Cc: Tony Lindgren Cc: Zhou Wang Cc: iss_storagedev@hp.com Cc: linux-mips@linux-mips.org Cc: linux-mtd@lists.infradead.org Link: http://lkml.kernel.org/r/1425565425-12604-1-git-send-email-valentinrothberg@gmail.com Signed-off-by: Ingo Molnar --- Documentation/scsi/ncr53c8xx.txt | 25 ------------------------- Documentation/scsi/tmscsim.txt | 4 ---- arch/mips/loongson/loongson-3/hpet.c | 2 +- drivers/block/cpqarray.c | 4 ++-- drivers/bus/omap_l3_noc.c | 4 ++-- drivers/bus/omap_l3_smx.c | 10 ++++------ drivers/mtd/nand/hisi504_nand.c | 3 +-- drivers/usb/isp1760/isp1760-core.c | 3 +-- drivers/usb/isp1760/isp1760-udc.c | 4 ++-- include/linux/interrupt.h | 3 --- 10 files changed, 13 insertions(+), 49 deletions(-) diff --git a/Documentation/scsi/ncr53c8xx.txt b/Documentation/scsi/ncr53c8xx.txt index 1d508dcbf8594..8586efff1e995 100644 --- a/Documentation/scsi/ncr53c8xx.txt +++ b/Documentation/scsi/ncr53c8xx.txt @@ -786,7 +786,6 @@ port address 0x1400. irqm:1 same as initial settings (assumed BIOS settings) irqm:2 always totem pole irqm:0x10 driver will not use IRQF_SHARED flag when requesting irq - irqm:0x20 driver will not use IRQF_DISABLED flag when requesting irq (Bits 0x10 and 0x20 can be combined with hardware irq mode option) @@ -1231,30 +1230,6 @@ they only refer to system buffers that are well aligned. So, a work around may only be needed under Linux when a scatter/gather list is not used and when the SCSI DATA IN phase is reentered after a phase mismatch. -14.5 IRQ sharing problems - -When an IRQ is shared by devices that are handled by different drivers, it -may happen that one driver complains about the request of the IRQ having -failed. Inder Linux-2.0, this may be due to one driver having requested the -IRQ using the IRQF_DISABLED flag but some other having requested the same IRQ -without this flag. Under both Linux-2.0 and linux-2.2, this may be caused by -one driver not having requested the IRQ with the IRQF_SHARED flag. - -By default, the ncr53c8xx and sym53c8xx drivers request IRQs with both the -IRQF_DISABLED and the IRQF_SHARED flag under Linux-2.0 and with only the IRQF_SHARED -flag under Linux-2.2. - -Under Linux-2.0, you can disable use of IRQF_DISABLED flag from the boot -command line by using the following option: - - ncr53c8xx=irqm:0x20 (for the generic ncr53c8xx driver) - sym53c8xx=irqm:0x20 (for the sym53c8xx driver) - -If this does not fix the problem, then you may want to check how all other -drivers are requesting the IRQ and report the problem. Note that if at least -a single driver does not request the IRQ with the IRQF_SHARED flag (share IRQ), -then the request of the IRQ obviously will not succeed for all the drivers. - 15. SCSI problem troubleshooting 15.1 Problem tracking diff --git a/Documentation/scsi/tmscsim.txt b/Documentation/scsi/tmscsim.txt index 0810132772a87..0e0322bf0020d 100644 --- a/Documentation/scsi/tmscsim.txt +++ b/Documentation/scsi/tmscsim.txt @@ -107,10 +107,6 @@ produced errors and started to corrupt my disks. So don't do that! A 37.50 MHz PCI bus works for me, though, but I don't recommend using higher clocks than the 33.33 MHz being in the PCI spec. -If you want to share the IRQ with another device and the driver refuses to -do so, you might succeed with changing the DC390_IRQ type in tmscsim.c to -IRQF_SHARED | IRQF_DISABLED. - 3.Features ---------- diff --git a/arch/mips/loongson/loongson-3/hpet.c b/arch/mips/loongson/loongson-3/hpet.c index e898d68668a95..5c21cd3bd339a 100644 --- a/arch/mips/loongson/loongson-3/hpet.c +++ b/arch/mips/loongson/loongson-3/hpet.c @@ -162,7 +162,7 @@ static irqreturn_t hpet_irq_handler(int irq, void *data) static struct irqaction hpet_irq = { .handler = hpet_irq_handler, - .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TIMER, + .flags = IRQF_NOBALANCING | IRQF_TIMER, .name = "hpet", }; diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c index 2b94403845368..f749df9e15cd4 100644 --- a/drivers/block/cpqarray.c +++ b/drivers/block/cpqarray.c @@ -405,8 +405,8 @@ static int cpqarray_register_ctlr(int i, struct pci_dev *pdev) goto Enomem4; } hba[i]->access.set_intr_mask(hba[i], 0); - if (request_irq(hba[i]->intr, do_ida_intr, - IRQF_DISABLED|IRQF_SHARED, hba[i]->devname, hba[i])) + if (request_irq(hba[i]->intr, do_ida_intr, IRQF_SHARED, + hba[i]->devname, hba[i])) { printk(KERN_ERR "cpqarray: Unable to get irq %d for %s\n", hba[i]->intr, hba[i]->devname); diff --git a/drivers/bus/omap_l3_noc.c b/drivers/bus/omap_l3_noc.c index 029bc73de001c..11f7982cbdb32 100644 --- a/drivers/bus/omap_l3_noc.c +++ b/drivers/bus/omap_l3_noc.c @@ -284,7 +284,7 @@ static int omap_l3_probe(struct platform_device *pdev) */ l3->debug_irq = platform_get_irq(pdev, 0); ret = devm_request_irq(l3->dev, l3->debug_irq, l3_interrupt_handler, - IRQF_DISABLED, "l3-dbg-irq", l3); + 0x0, "l3-dbg-irq", l3); if (ret) { dev_err(l3->dev, "request_irq failed for %d\n", l3->debug_irq); @@ -293,7 +293,7 @@ static int omap_l3_probe(struct platform_device *pdev) l3->app_irq = platform_get_irq(pdev, 1); ret = devm_request_irq(l3->dev, l3->app_irq, l3_interrupt_handler, - IRQF_DISABLED, "l3-app-irq", l3); + 0x0, "l3-app-irq", l3); if (ret) dev_err(l3->dev, "request_irq failed for %d\n", l3->app_irq); diff --git a/drivers/bus/omap_l3_smx.c b/drivers/bus/omap_l3_smx.c index 597fdaee73150..360a5c0a4ee0f 100644 --- a/drivers/bus/omap_l3_smx.c +++ b/drivers/bus/omap_l3_smx.c @@ -251,18 +251,16 @@ static int omap3_l3_probe(struct platform_device *pdev) } l3->debug_irq = platform_get_irq(pdev, 0); - ret = request_irq(l3->debug_irq, omap3_l3_app_irq, - IRQF_DISABLED | IRQF_TRIGGER_RISING, - "l3-debug-irq", l3); + ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING, + "l3-debug-irq", l3); if (ret) { dev_err(&pdev->dev, "couldn't request debug irq\n"); goto err1; } l3->app_irq = platform_get_irq(pdev, 1); - ret = request_irq(l3->app_irq, omap3_l3_app_irq, - IRQF_DISABLED | IRQF_TRIGGER_RISING, - "l3-app-irq", l3); + ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING, + "l3-app-irq", l3); if (ret) { dev_err(&pdev->dev, "couldn't request app irq\n"); goto err2; diff --git a/drivers/mtd/nand/hisi504_nand.c b/drivers/mtd/nand/hisi504_nand.c index 289ad3ac3e80d..8dcc7b8fee406 100644 --- a/drivers/mtd/nand/hisi504_nand.c +++ b/drivers/mtd/nand/hisi504_nand.c @@ -758,8 +758,7 @@ static int hisi_nfc_probe(struct platform_device *pdev) hisi_nfc_host_init(host); - ret = devm_request_irq(dev, irq, hinfc_irq_handle, IRQF_DISABLED, - "nandc", host); + ret = devm_request_irq(dev, irq, hinfc_irq_handle, 0x0, "nandc", host); if (ret) { dev_err(dev, "failed to request IRQ\n"); goto err_res; diff --git a/drivers/usb/isp1760/isp1760-core.c b/drivers/usb/isp1760/isp1760-core.c index b9827556455f7..5c37f40f61225 100644 --- a/drivers/usb/isp1760/isp1760-core.c +++ b/drivers/usb/isp1760/isp1760-core.c @@ -151,8 +151,7 @@ int isp1760_register(struct resource *mem, int irq, unsigned long irqflags, } if (IS_ENABLED(CONFIG_USB_ISP1761_UDC) && !udc_disabled) { - ret = isp1760_udc_register(isp, irq, irqflags | IRQF_SHARED | - IRQF_DISABLED); + ret = isp1760_udc_register(isp, irq, irqflags | IRQF_SHARED); if (ret < 0) { isp1760_hcd_unregister(&isp->hcd); return ret; diff --git a/drivers/usb/isp1760/isp1760-udc.c b/drivers/usb/isp1760/isp1760-udc.c index 9612d7990565c..0b46ff01299fc 100644 --- a/drivers/usb/isp1760/isp1760-udc.c +++ b/drivers/usb/isp1760/isp1760-udc.c @@ -1451,8 +1451,8 @@ int isp1760_udc_register(struct isp1760_device *isp, int irq, sprintf(udc->irqname, "%s (udc)", devname); - ret = request_irq(irq, isp1760_udc_irq, IRQF_SHARED | IRQF_DISABLED | - irqflags, udc->irqname, udc); + ret = request_irq(irq, isp1760_udc_irq, IRQF_SHARED | irqflags, + udc->irqname, udc); if (ret < 0) goto error; diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 3bb01b9a379cf..2cee1761c77d2 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -39,8 +39,6 @@ * These flags used only by the kernel as part of the * irq handling routines. * - * IRQF_DISABLED - keep irqs disabled when calling the action handler. - * DEPRECATED. This flag is a NOOP and scheduled to be removed * IRQF_SHARED - allow sharing the irq among several devices * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur * IRQF_TIMER - Flag to mark this interrupt as timer interrupt @@ -58,7 +56,6 @@ * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device * resume time. */ -#define IRQF_DISABLED 0x00000020 #define IRQF_SHARED 0x00000080 #define IRQF_PROBE_SHARED 0x00000100 #define __IRQF_TIMER 0x00000200 -- 2.39.5