| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1477945112-25659-2-git-send-email-linux@rainbow-software.org>
Date: Mon, 31 Oct 2016 21:18:27 +0100
From: Ondrej Zary <linux@...nbow-software.org>
To: Christoph Hellwig <hch@...radead.org>
Cc: Finn Thain <fthain@...egraphics.com.au>,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] NCR5380: Use probe_irq_*() for IRQ probing
Use standard probe_irq_on() and probe_irq_off() functions instead of
own implementation.
This prevents warning messages like this in the kernel log:
genirq: Flags mismatch irq 1. 00000000 (NCR-probe) vs. 00000080 (i8042)
Move the IRQ trigger code to a separate function so it can be used for
other purposes (testing if the IRQ works) and move the code from
NCR5380 to g_NCR5380.
Also add missing IRQ reset before and after the probe.
Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
---
drivers/scsi/NCR5380.c | 77 +---------------------------------------------
drivers/scsi/NCR5380.h | 1 -
drivers/scsi/g_NCR5380.c | 50 +++++++++++++++++++++++++++++-
3 files changed, 50 insertions(+), 78 deletions(-)
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index d849ffa..4f5ca79 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -97,9 +97,6 @@
* and macros and include this file in your driver.
*
* These macros control options :
- * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
- * defined.
- *
* AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
* for commands that return with a CHECK CONDITION status.
*
@@ -127,9 +124,7 @@
* NCR5380_dma_residual - residual byte count
*
* The generic driver is initialized by calling NCR5380_init(instance),
- * after setting the appropriate host specific fields and ID. If the
- * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
- * possible) function may be used.
+ * after setting the appropriate host specific fields and ID.
*/
#ifndef NCR5380_io_delay
@@ -351,76 +346,6 @@ static void NCR5380_print_phase(struct Scsi_Host *instance)
}
#endif
-
-static int probe_irq;
-
-/**
- * probe_intr - helper for IRQ autoprobe
- * @irq: interrupt number
- * @dev_id: unused
- * @regs: unused
- *
- * Set a flag to indicate the IRQ in question was received. This is
- * used by the IRQ probe code.
- */
-
-static irqreturn_t probe_intr(int irq, void *dev_id)
-{
- probe_irq = irq;
- return IRQ_HANDLED;
-}
-
-/**
- * NCR5380_probe_irq - find the IRQ of an NCR5380
- * @instance: NCR5380 controller
- * @possible: bitmask of ISA IRQ lines
- *
- * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
- * and then looking to see what interrupt actually turned up.
- */
-
-static int __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
- int possible)
-{
- struct NCR5380_hostdata *hostdata = shost_priv(instance);
- unsigned long timeout;
- int trying_irqs, i, mask;
-
- for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1)
- if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0))
- trying_irqs |= mask;
-
- timeout = jiffies + msecs_to_jiffies(250);
- probe_irq = NO_IRQ;
-
- /*
- * A interrupt is triggered whenever BSY = false, SEL = true
- * and a bit set in the SELECT_ENABLE_REG is asserted on the
- * SCSI bus.
- *
- * Note that the bus is only driven when the phase control signals
- * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
- * to zero.
- */
-
- NCR5380_write(TARGET_COMMAND_REG, 0);
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
-
- while (probe_irq == NO_IRQ && time_before(jiffies, timeout))
- schedule_timeout_uninterruptible(1);
-
- NCR5380_write(SELECT_ENABLE_REG, 0);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
-
- for (i = 1, mask = 2; i < 16; ++i, mask <<= 1)
- if (trying_irqs & mask)
- free_irq(i, NULL);
-
- return probe_irq;
-}
-
/**
* NCR58380_info - report driver and host information
* @instance: relevant scsi host instance
diff --git a/drivers/scsi/NCR5380.h b/drivers/scsi/NCR5380.h
index 3c6ce54..4724558 100644
--- a/drivers/scsi/NCR5380.h
+++ b/drivers/scsi/NCR5380.h
@@ -290,7 +290,6 @@ static inline struct scsi_cmnd *NCR5380_to_scmd(struct NCR5380_cmd *ncmd_ptr)
#define NCR5380_dprint_phase(flg, arg) do {} while (0)
#endif
-static int NCR5380_probe_irq(struct Scsi_Host *instance, int possible);
static int NCR5380_init(struct Scsi_Host *instance, int flags);
static int NCR5380_maybe_reset_bus(struct Scsi_Host *);
static void NCR5380_exit(struct Scsi_Host *instance);
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index 7299ad9..09c660b 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -67,6 +67,54 @@
MODULE_ALIAS("g_NCR5380_mmio");
MODULE_LICENSE("GPL");
+static void NCR5380_trigger_irq(struct Scsi_Host *instance)
+{
+ struct NCR5380_hostdata *hostdata = shost_priv(instance);
+
+ /*
+ * An interrupt is triggered whenever BSY = false, SEL = true
+ * and a bit set in the SELECT_ENABLE_REG is asserted on the
+ * SCSI bus.
+ *
+ * Note that the bus is only driven when the phase control signals
+ * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
+ * to zero.
+ */
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
+
+ usleep_range(1000, 20000);
+
+ NCR5380_write(SELECT_ENABLE_REG, 0);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+}
+
+/**
+ * NCR5380_probe_irq - find the IRQ of an NCR5380
+ * @instance: NCR5380 controller
+ *
+ * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
+ * and then looking to see what interrupt actually turned up.
+ */
+
+static int NCR5380_probe_irq(struct Scsi_Host *instance)
+{
+ struct NCR5380_hostdata *hostdata = shost_priv(instance);
+ int irq_mask, irq;
+
+ NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ irq_mask = probe_irq_on();
+ NCR5380_trigger_irq(instance);
+ irq = probe_irq_off(irq_mask);
+ NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ if (irq < 0)
+ irq = NO_IRQ;
+
+ return irq;
+}
+
/*
* Configure I/O address of 53C400A or DTC436 by writing magic numbers
* to ports 0x779 and 0x379.
@@ -265,7 +313,7 @@ static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
if (irq != IRQ_AUTO)
instance->irq = irq;
else
- instance->irq = NCR5380_probe_irq(instance, 0xffff);
+ instance->irq = NCR5380_probe_irq(instance);
/* Compatibility with documented NCR5380 kernel parameters */
if (instance->irq == 255)
--
Ondrej Zary
Powered by blists - more mailing lists