libata: add ata_ratelimit(), use it in AHCI driver irq handler (67846b30) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/scsi/ahci.c

+25 −6

Original line number	Diff line number	Diff line
		@@ -672,19 +672,38 @@ static irqreturn_t ahci_interrupt (int irq, void dev_instance, struct pt_regs

		for (i = 0; i < host_set->n_ports; i++) {
		struct ata_port *ap;
		u32 tmp;

		VPRINTK("port %u\n", i);
		if (!(irq_stat & (1 << i)))
		continue;

		ap = host_set->ports[i];
		tmp = irq_stat & (1 << i);
		if (tmp && ap) {
		if (ap) {
		struct ata_queued_cmd *qc;
		qc = ata_qc_from_tag(ap, ap->active_tag);
		if (ahci_host_intr(ap, qc))
		irq_ack \|= (1 << i);
		if (!ahci_host_intr(ap, qc))
		if (ata_ratelimit()) {
		struct pci_dev *pdev =
		to_pci_dev(ap->host_set->dev);
		printk(KERN_WARNING
		"ahci(%s): unhandled interrupt on port %u\n",
		pci_name(pdev), i);
		}

		VPRINTK("port %u\n", i);
		} else {
		VPRINTK("port %u (no irq)\n", i);
		if (ata_ratelimit()) {
		struct pci_dev *pdev =
		to_pci_dev(ap->host_set->dev);
		printk(KERN_WARNING
		"ahci(%s): interrupt on disabled port %u\n",
		pci_name(pdev), i);
		}
		}

		irq_ack \|= (1 << i);
		}

		if (irq_ack) {
		writel(irq_ack, mmio + HOST_IRQ_STAT);
		handled = 1;

+23 −0

Original line number	Diff line number	Diff line
		@@ -48,6 +48,7 @@
		#include <linux/completion.h>
		#include <linux/suspend.h>
		#include <linux/workqueue.h>
		#include <linux/jiffies.h>
		#include <scsi/scsi.h>
		#include "scsi.h"
		#include "scsi_priv.h"
		@@ -4688,6 +4689,27 @@ static void __exit ata_exit(void)
		module_init(ata_init);
		module_exit(ata_exit);

		static unsigned long ratelimit_time;
		static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;

		int ata_ratelimit(void)
		{
		int rc;
		unsigned long flags;

		spin_lock_irqsave(&ata_ratelimit_lock, flags);

		if (time_after(jiffies, ratelimit_time)) {
		rc = 1;
		ratelimit_time = jiffies + (HZ/5);
		} else
		rc = 0;

		spin_unlock_irqrestore(&ata_ratelimit_lock, flags);

		return rc;
		}

		/*
		* libata is essentially a library of internal helper functions for
		* low-level ATA host controller drivers. As such, the API/ABI is
		@@ -4729,6 +4751,7 @@ EXPORT_SYMBOL_GPL(sata_phy_reset);
		EXPORT_SYMBOL_GPL(__sata_phy_reset);
		EXPORT_SYMBOL_GPL(ata_bus_reset);
		EXPORT_SYMBOL_GPL(ata_port_disable);
		EXPORT_SYMBOL_GPL(ata_ratelimit);
		EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
		EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
		EXPORT_SYMBOL_GPL(ata_scsi_error);

+2 −0

Original line number	Diff line number	Diff line
		@@ -410,6 +410,8 @@ extern int ata_scsi_queuecmd(struct scsi_cmnd cmd, void (done)(struct scsi_cmn
		extern int ata_scsi_error(struct Scsi_Host *host);
		extern int ata_scsi_release(struct Scsi_Host *host);
		extern unsigned int ata_host_intr(struct ata_port ap, struct ata_queued_cmd qc);
		extern int ata_ratelimit(void);

		/*
		* Default driver ops implementations
		*/