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[PATCH 0/3] IDE-ACPI: Fine-tuning for a function

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  [PATCH 0/3] IDE-ACPI: Fine-tuning for a function SF Markus Elfring <elfring@users.sourceforge.net> - 2015-12-26 11:20 +0100
    [PATCH 2/3] IDE-ACPI: Delete unnecessary null pointer checks in  ide_get_dev_handle() SF Markus Elfring <elfring@users.sourceforge.net> - 2015-12-26 11:20 +0100
    [PATCH 1/3] IDE-ACPI: One function call less in ide_get_dev_handle()  after error detection SF Markus Elfring <elfring@users.sourceforge.net> - 2015-12-26 11:20 +0100
    [PATCH 3/3] IDE-ACPI: Move an assignment for one variable in  ide_get_dev_handle() SF Markus Elfring <elfring@users.sourceforge.net> - 2015-12-26 11:30 +0100
    Re: [PATCH 0/3] IDE-ACPI: Fine-tuning for a function David Miller <davem@davemloft.net> - 2015-12-26 19:20 +0100
      Re: [PATCH 0/3] IDE-ACPI: Fine-tuning for a function Joe Perches <joe@perches.com> - 2015-12-27 00:50 +0100
        Re: [PATCH 0/3] IDE-ACPI: Fine-tuning for a function Julia Lawall <julia.lawall@lip6.fr> - 2015-12-27 07:10 +0100

#1298180 — [PATCH 0/3] IDE-ACPI: Fine-tuning for a function

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sat, 26 Dec 2015 11:04:56 +0100

A few update suggestions were taken into account
from static source code analysis.

Markus Elfring (3):
  One function call less in ide_get_dev_handle() after error detection
  Delete unnecessary null pointer checks in ide_get_dev_handle()
  Move an assignment for one variable in ide_get_dev_handle()

 drivers/ide/ide-acpi.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

-- 
2.6.3

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#1298181 — [PATCH 2/3] IDE-ACPI: Delete unnecessary null pointer checks in ide_get_dev_handle()

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sat, 26 Dec 2015 10:33:48 +0100

The variable "dinfo" will contain an appropropriate pointer after a call
of the acpi_get_object_info() function succeeded.
Thus remove two safety checks.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/ide/ide-acpi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ide/ide-acpi.c b/drivers/ide/ide-acpi.c
index 319b754..b6b2111 100644
--- a/drivers/ide/ide-acpi.c
+++ b/drivers/ide/ide-acpi.c
@@ -148,14 +148,14 @@ static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 		DEBPRINT("get_object_info for device failed\n");
 		return -ENODEV;
 	}
-	if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
+	if ((dinfo->valid & ACPI_VALID_ADR) &&
 	    dinfo->address == addr) {
 		*pcidevfn = addr;
 		*handle = dev_handle;
 	} else {
 		DEBPRINT("get_object_info for device has wrong "
 			" address: %llu, should be %u\n",
-			dinfo ? (unsigned long long)dinfo->address : -1ULL,
+			(unsigned long long)dinfo->address,
 			(unsigned int)addr);
 		ret = -ENODEV;
 		goto free_info;
-- 
2.6.3

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#1298182 — [PATCH 1/3] IDE-ACPI: One function call less in ide_get_dev_handle() after error detection

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sat, 26 Dec 2015 10:01:36 +0100

The kfree() function was called in two cases by the
ide_get_dev_handle() function during error handling
even if the passed variable "dinfo" contained a null pointer.

* Let us return directly if a call of the function "ACPI_HANDLE"
  or "acpi_get_object_info" failed.

* Delete the explicit initialisation for the variables "dinfo" and "ret"
  at the beginning then.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/ide/ide-acpi.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/ide/ide-acpi.c b/drivers/ide/ide-acpi.c
index b694099..319b754 100644
--- a/drivers/ide/ide-acpi.c
+++ b/drivers/ide/ide-acpi.c
@@ -126,8 +126,8 @@ static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 	u64 addr;
 	acpi_handle dev_handle;
 	acpi_status status;
-	struct acpi_device_info	*dinfo = NULL;
-	int ret = -ENODEV;
+	struct acpi_device_info	*dinfo;
+	int ret;
 
 	bus = pdev->bus->number;
 	devnum = PCI_SLOT(pdev->devfn);
@@ -140,13 +140,13 @@ static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 	dev_handle = ACPI_HANDLE(dev);
 	if (!dev_handle) {
 		DEBPRINT("no acpi handle for device\n");
-		goto err;
+		return -ENODEV;
 	}
 
 	status = acpi_get_object_info(dev_handle, &dinfo);
 	if (ACPI_FAILURE(status)) {
 		DEBPRINT("get_object_info for device failed\n");
-		goto err;
+		return -ENODEV;
 	}
 	if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
 	    dinfo->address == addr) {
@@ -157,13 +157,14 @@ static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 			" address: %llu, should be %u\n",
 			dinfo ? (unsigned long long)dinfo->address : -1ULL,
 			(unsigned int)addr);
-		goto err;
+		ret = -ENODEV;
+		goto free_info;
 	}
 
 	DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
 		 devnum, func, (unsigned long long)addr, *handle);
 	ret = 0;
-err:
+free_info:
 	kfree(dinfo);
 	return ret;
 }
-- 
2.6.3

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#1298183 — [PATCH 3/3] IDE-ACPI: Move an assignment for one variable in ide_get_dev_handle()

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sat, 26 Dec 2015 10:50:33 +0100

Move the assignment for the variable "addr" to the statement
where its value is used after previous function calls succeeded.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/ide/ide-acpi.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/ide/ide-acpi.c b/drivers/ide/ide-acpi.c
index b6b2111..c2de9f9 100644
--- a/drivers/ide/ide-acpi.c
+++ b/drivers/ide/ide-acpi.c
@@ -132,9 +132,6 @@ static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 	bus = pdev->bus->number;
 	devnum = PCI_SLOT(pdev->devfn);
 	func = PCI_FUNC(pdev->devfn);
-	/* ACPI _ADR encoding for PCI bus: */
-	addr = (u64)(devnum << 16 | func);
-
 	DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func);
 
 	dev_handle = ACPI_HANDLE(dev);
@@ -148,6 +145,8 @@ static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 		DEBPRINT("get_object_info for device failed\n");
 		return -ENODEV;
 	}
+	/* ACPI _ADR encoding for PCI bus: */
+	addr = (u64)(devnum << 16 | func);
 	if ((dinfo->valid & ACPI_VALID_ADR) &&
 	    dinfo->address == addr) {
 		*pcidevfn = addr;
-- 
2.6.3

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#1298239

IDE is in deep freeze maintainence mode.

Therefore patches that perform simplications and cleanups will
not be accepted.

Thanks.
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#1298298

On Sat, 2015-12-26 at 13:12 -0500, David Miller wrote:
> IDE is in deep freeze maintainence mode.
> 
> Therefore patches that perform simplications and cleanups will
> not be accepted.

Maybe there should be something like a README
in drivers/ide that says that.

Maybe the MAINTAINERS entry for "IDE SUBSYSTEM"
should be something like:

S:	Frozen - critical fixes only

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#1298324

On Sat, 26 Dec 2015, Joe Perches wrote:

> On Sat, 2015-12-26 at 13:12 -0500, David Miller wrote:
> > IDE is in deep freeze maintainence mode.
> > 
> > Therefore patches that perform simplications and cleanups will
> > not be accepted.
> 
> Maybe there should be something like a README
> in drivers/ide that says that.
> 
> Maybe the MAINTAINERS entry for "IDE SUBSYSTEM"
> should be something like:
> 
> S:	Frozen - critical fixes only

This could be a good idea.  Sometimes I hold off on sending patches for 
things becuse I have the impression that the subsystem doesn't want minor 
fixes, but I could be wrong, and if one could have a deterministic way to 
know, it could be better for everyone.

julia
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