[patch 08/18] 3c59x: check return of pci_enable_device()

[patch 08/18] 3c59x: check return of pci_enable_device()

[akpm]

From: Mark Hindley <mark@hindley.org.uk>

Check return of pci_enable_device in vortex_up().

Signed-off-by: Mark Hindley <mark@hindley.org.uk>
Acked-by: Steffen Klassert <klassert@mathematik.tu-chemnitz.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/net/3c59x.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff -puN drivers/net/3c59x.c~3c59x-check-return-of-pci_enable_device drivers/net/3c59x.c
--- a/drivers/net/3c59x.c~3c59x-check-return-of-pci_enable_device
+++ a/drivers/net/3c59x.c
@@ -1490,13 +1490,17 @@ vortex_up(struct net_device *dev)
 	struct vortex_private *vp = netdev_priv(dev);
 	void __iomem *ioaddr = vp->ioaddr;
 	unsigned int config;
-	int i, mii_reg1, mii_reg5;
+	int i, mii_reg1, mii_reg5, err;
 
 	if (VORTEX_PCI(vp)) {
 		pci_set_power_state(VORTEX_PCI(vp), PCI_D0);	/* Go active */
 		if (vp->pm_state_valid)
 			pci_restore_state(VORTEX_PCI(vp));
-		pci_enable_device(VORTEX_PCI(vp));
+		err = pci_enable_device(VORTEX_PCI(vp));
+		if (err) {
+			printk(KERN_WARNING "%s: Could not enable device \n",
+				dev->name);
+		}
 	}
 
 	/* Before initializing select the active media port. */
_

Re: [patch 08/18] 3c59x: check return of pci_enable_device()

[Jeff Garzik]

akpm@linux-foundation.org wrote:
> From: Mark Hindley <mark@hindley.org.uk>
> 
> Check return of pci_enable_device in vortex_up().
> 
> Signed-off-by: Mark Hindley <mark@hindley.org.uk>
> Acked-by: Steffen Klassert <klassert@mathematik.tu-chemnitz.de>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
> 
>  drivers/net/3c59x.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff -puN drivers/net/3c59x.c~3c59x-check-return-of-pci_enable_device drivers/net/3c59x.c
> --- a/drivers/net/3c59x.c~3c59x-check-return-of-pci_enable_device
> +++ a/drivers/net/3c59x.c
> @@ -1490,13 +1490,17 @@ vortex_up(struct net_device *dev)
>  	struct vortex_private *vp = netdev_priv(dev);
>  	void __iomem *ioaddr = vp->ioaddr;
>  	unsigned int config;
> -	int i, mii_reg1, mii_reg5;
> +	int i, mii_reg1, mii_reg5, err;
>  
>  	if (VORTEX_PCI(vp)) {
>  		pci_set_power_state(VORTEX_PCI(vp), PCI_D0);	/* Go active */
>  		if (vp->pm_state_valid)
>  			pci_restore_state(VORTEX_PCI(vp));
> -		pci_enable_device(VORTEX_PCI(vp));
> +		err = pci_enable_device(VORTEX_PCI(vp));
> +		if (err) {
> +			printk(KERN_WARNING "%s: Could not enable device \n",
> +				dev->name);
> +		}

I would strongly prefer that vortex_up return a value, since all the 
important callers of this function can themselves return an error back 
to the system.

we can definitely return a meaningful return value here, if 
pci_enable_device() fails, and I would rather not apply a patch that 
fails to propagate a serious condition (pci_enable_device failure is 
indeed serious) when it is possible to do so

Re: [patch 08/18] 3c59x: check return of pci_enable_device()

[Mark Hindley]

On Tue, Aug 14, 2007 at 01:33:26AM -0400, Jeff Garzik wrote:
> I would strongly prefer that vortex_up return a value, since all the 
> important callers of this function can themselves return an error back 
> to the system.
> 
> we can definitely return a meaningful return value here, if 
> pci_enable_device() fails, and I would rather not apply a patch that 
> fails to propagate a serious condition (pci_enable_device failure is 
> indeed serious) when it is possible to do so
> 

OK. Any comments on this revised version? I have only ignored the return of
vortex_up in vortex_error. It is not immediately clear what to do if
vortex_up still fails there after a pci reset.

Mark


diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index 001c66d..a1dfd6b 100644
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -705,7 +705,7 @@ static struct {
 
 static int vortex_probe1(struct device *gendev, void __iomem *ioaddr, int irq,
 				   int chip_idx, int card_idx);
-static void vortex_up(struct net_device *dev);
+static int vortex_up(struct net_device *dev);
 static void vortex_down(struct net_device *dev, int final);
 static int vortex_open(struct net_device *dev);
 static void mdio_sync(void __iomem *ioaddr, int bits);
@@ -841,8 +841,11 @@ static int vortex_resume(struct pci_dev *pdev)
 			return -EBUSY;
 		}
 		if (netif_running(dev)) {
-			vortex_up(dev);
-			netif_device_attach(dev);
+			err = vortex_up(dev);
+			if (err)
+				return err;
+			else  
+				netif_device_attach(dev);
 		}
 	}
 	return 0;
@@ -1484,19 +1487,24 @@ static void vortex_check_media(struct net_device *dev, unsigned int init)
 	}
 }
 
-static void
+static int
 vortex_up(struct net_device *dev)
 {
 	struct vortex_private *vp = netdev_priv(dev);
 	void __iomem *ioaddr = vp->ioaddr;
 	unsigned int config;
-	int i, mii_reg1, mii_reg5;
+	int i, mii_reg1, mii_reg5, err;
 
 	if (VORTEX_PCI(vp)) {
 		pci_set_power_state(VORTEX_PCI(vp), PCI_D0);	/* Go active */
 		if (vp->pm_state_valid)
 			pci_restore_state(VORTEX_PCI(vp));
-		pci_enable_device(VORTEX_PCI(vp));
+		err = pci_enable_device(VORTEX_PCI(vp));
+		if (err) {
+			printk(KERN_WARNING "%s: Could not enable device \n",
+				dev->name);
+			goto err_out;
+		}
 	}
 
 	/* Before initializing select the active media port. */
@@ -1660,6 +1668,8 @@ vortex_up(struct net_device *dev)
 	if (vp->cb_fn_base)			/* The PCMCIA people are idiots.  */
 		iowrite32(0x8000, vp->cb_fn_base + 4);
 	netif_start_queue (dev);
+err_out:
+	return err;
 }
 
 static int
@@ -1673,7 +1683,7 @@ vortex_open(struct net_device *dev)
 	if ((retval = request_irq(dev->irq, vp->full_bus_master_rx ?
 				&boomerang_interrupt : &vortex_interrupt, IRQF_SHARED, dev->name, dev))) {
 		printk(KERN_ERR "%s: Could not reserve IRQ %d\n", dev->name, dev->irq);
-		goto out;
+		goto err;
 	}
 
 	if (vp->full_bus_master_rx) { /* Boomerang bus master. */
@@ -1702,20 +1712,22 @@ vortex_open(struct net_device *dev)
 				}
 			}
 			retval = -ENOMEM;
-			goto out_free_irq;
+			goto err_free_irq;
 		}
 		/* Wrap the ring. */
 		vp->rx_ring[i-1].next = cpu_to_le32(vp->rx_ring_dma);
 	}
 
-	vortex_up(dev);
-	return 0;
+	retval = vortex_up(dev);
+	if (!retval)
+		goto out;
 
-out_free_irq:
+err_free_irq:
 	free_irq(dev->irq, dev);
-out:
+err:
 	if (vortex_debug > 1)
 		printk(KERN_ERR "%s: vortex_open() fails: returning %d\n", dev->name, retval);
+out:
 	return retval;
 }
 

Re: [patch 08/18] 3c59x: check return of pci_enable_device()

[Steffen Klassert]

On Tue, Aug 14, 2007 at 10:54:32AM +0100, Mark Hindley wrote:
> On Tue, Aug 14, 2007 at 01:33:26AM -0400, Jeff Garzik wrote:
> > I would strongly prefer that vortex_up return a value, since all the 
> > important callers of this function can themselves return an error back 
> > to the system.
> > 
> > we can definitely return a meaningful return value here, if 
> > pci_enable_device() fails, and I would rather not apply a patch that 
> > fails to propagate a serious condition (pci_enable_device failure is 
> > indeed serious) when it is possible to do so
> > 
> 
> OK. Any comments on this revised version? I have only ignored the return of
> vortex_up in vortex_error. It is not immediately clear what to do if
> vortex_up still fails there after a pci reset.
> 
> Mark
> 
> 
> diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
> index 001c66d..a1dfd6b 100644
> --- a/drivers/net/3c59x.c
> +++ b/drivers/net/3c59x.c
> @@ -705,7 +705,7 @@ static struct {
>  
>  static int vortex_probe1(struct device *gendev, void __iomem *ioaddr, int irq,
>  				   int chip_idx, int card_idx);
> -static void vortex_up(struct net_device *dev);
> +static int vortex_up(struct net_device *dev);
>  static void vortex_down(struct net_device *dev, int final);
>  static int vortex_open(struct net_device *dev);
>  static void mdio_sync(void __iomem *ioaddr, int bits);
> @@ -841,8 +841,11 @@ static int vortex_resume(struct pci_dev *pdev)
>  			return -EBUSY;
>  		}
>  		if (netif_running(dev)) {
> -			vortex_up(dev);
> -			netif_device_attach(dev);
> +			err = vortex_up(dev);
> +			if (err)
> +				return err;
> +			else  
> +				netif_device_attach(dev);
>  		}
>  	}
>  	return 0;

I think we should free the requested irq if vortex_up really fails here.


Steffen

Re: [patch 08/18] 3c59x: check return of pci_enable_device()

[Steffen Klassert]

On Wed, Aug 15, 2007 at 06:30:00PM +0200, Steffen Klassert wrote:
> On Tue, Aug 14, 2007 at 10:54:32AM +0100, Mark Hindley wrote:
> > On Tue, Aug 14, 2007 at 01:33:26AM -0400, Jeff Garzik wrote:
> > > I would strongly prefer that vortex_up return a value, since all the 
> > > important callers of this function can themselves return an error back 
> > > to the system.
> > > 
> > > we can definitely return a meaningful return value here, if 
> > > pci_enable_device() fails, and I would rather not apply a patch that 
> > > fails to propagate a serious condition (pci_enable_device failure is 
> > > indeed serious) when it is possible to do so
> > > 
> > 
> > OK. Any comments on this revised version? I have only ignored the return of
> > vortex_up in vortex_error. It is not immediately clear what to do if
> > vortex_up still fails there after a pci reset.
> > 
> > Mark
> > 
> > 
> > diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
> > index 001c66d..a1dfd6b 100644
> > --- a/drivers/net/3c59x.c
> > +++ b/drivers/net/3c59x.c
> > @@ -705,7 +705,7 @@ static struct {
> >  
> >  static int vortex_probe1(struct device *gendev, void __iomem *ioaddr, int irq,
> >  				   int chip_idx, int card_idx);
> > -static void vortex_up(struct net_device *dev);
> > +static int vortex_up(struct net_device *dev);
> >  static void vortex_down(struct net_device *dev, int final);
> >  static int vortex_open(struct net_device *dev);
> >  static void mdio_sync(void __iomem *ioaddr, int bits);
> > @@ -841,8 +841,11 @@ static int vortex_resume(struct pci_dev *pdev)
> >  			return -EBUSY;
> >  		}
> >  		if (netif_running(dev)) {
> > -			vortex_up(dev);
> > -			netif_device_attach(dev);
> > +			err = vortex_up(dev);
> > +			if (err)
> > +				return err;
> > +			else  
> > +				netif_device_attach(dev);
> >  		}
> >  	}
> >  	return 0;
> 
> I think we should free the requested irq if vortex_up really fails here.
> 

I was wrong, this will be done in vortex_close. So it is OK as it is.

Steffen 

Re: [REVISED PATCH] 3c59x: check return of pci_enable_device()

[Mark Hindley]

Revised patch for this.

Mark


commit 5cf33391eba81a49038fa8be8cbad8425b80bf7f
Author: Mark Hindley <mark@hindley.org.uk>
Date:   Thu Aug 16 11:26:35 2007 +0100

    Check return of pci_enable_device in vortex_up().
    
    Also modify vortex_up to return error to callers. Handle failure of vortex_up in
    vortex_open and vortex_resume.
    
    Signed-off-by: Mark Hindley <mark@hindley.org.uk>

diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index 001c66d..7b3050c 100644
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -705,7 +705,7 @@ static struct {
 
 static int vortex_probe1(struct device *gendev, void __iomem *ioaddr, int irq,
 				   int chip_idx, int card_idx);
-static void vortex_up(struct net_device *dev);
+static int vortex_up(struct net_device *dev);
 static void vortex_down(struct net_device *dev, int final);
 static int vortex_open(struct net_device *dev);
 static void mdio_sync(void __iomem *ioaddr, int bits);
@@ -841,8 +841,11 @@ static int vortex_resume(struct pci_dev *pdev)
 			return -EBUSY;
 		}
 		if (netif_running(dev)) {
-			vortex_up(dev);
-			netif_device_attach(dev);
+			err = vortex_up(dev);
+			if (err)
+				return err;
+			else
+				netif_device_attach(dev);
 		}
 	}
 	return 0;
@@ -1484,19 +1487,24 @@ static void vortex_check_media(struct net_device *dev, unsigned int init)
 	}
 }
 
-static void
+static int
 vortex_up(struct net_device *dev)
 {
 	struct vortex_private *vp = netdev_priv(dev);
 	void __iomem *ioaddr = vp->ioaddr;
 	unsigned int config;
-	int i, mii_reg1, mii_reg5;
+	int i, mii_reg1, mii_reg5, err;
 
 	if (VORTEX_PCI(vp)) {
 		pci_set_power_state(VORTEX_PCI(vp), PCI_D0);	/* Go active */
 		if (vp->pm_state_valid)
 			pci_restore_state(VORTEX_PCI(vp));
-		pci_enable_device(VORTEX_PCI(vp));
+		err = pci_enable_device(VORTEX_PCI(vp));
+		if (err) {
+			printk(KERN_WARNING "%s: Could not enable device \n",
+				dev->name);
+			goto err_out;
+		}
 	}
 
 	/* Before initializing select the active media port. */
@@ -1660,6 +1668,8 @@ vortex_up(struct net_device *dev)
 	if (vp->cb_fn_base)			/* The PCMCIA people are idiots.  */
 		iowrite32(0x8000, vp->cb_fn_base + 4);
 	netif_start_queue (dev);
+err_out:
+	return err;
 }
 
 static int
@@ -1673,7 +1683,7 @@ vortex_open(struct net_device *dev)
 	if ((retval = request_irq(dev->irq, vp->full_bus_master_rx ?
 				&boomerang_interrupt : &vortex_interrupt, IRQF_SHARED, dev->name, dev))) {
 		printk(KERN_ERR "%s: Could not reserve IRQ %d\n", dev->name, dev->irq);
-		goto out;
+		goto err;
 	}
 
 	if (vp->full_bus_master_rx) { /* Boomerang bus master. */
@@ -1702,20 +1712,22 @@ vortex_open(struct net_device *dev)
 				}
 			}
 			retval = -ENOMEM;
-			goto out_free_irq;
+			goto err_free_irq;
 		}
 		/* Wrap the ring. */
 		vp->rx_ring[i-1].next = cpu_to_le32(vp->rx_ring_dma);
 	}
 
-	vortex_up(dev);
-	return 0;
+	retval = vortex_up(dev);
+	if (!retval)
+		goto out;
 
-out_free_irq:
+err_free_irq:
 	free_irq(dev->irq, dev);
-out:
+err:
 	if (vortex_debug > 1)
 		printk(KERN_ERR "%s: vortex_open() fails: returning %d\n", dev->name, retval);
+out:
 	return retval;
 }
 

Re: [REVISED PATCH] 3c59x: check return of pci_enable_device()

[Jeff Garzik]

Mark Hindley wrote:
> Revised patch for this.
> 
> Mark
> 
> 
> commit 5cf33391eba81a49038fa8be8cbad8425b80bf7f
> Author: Mark Hindley <mark@hindley.org.uk>
> Date:   Thu Aug 16 11:26:35 2007 +0100
> 
>     Check return of pci_enable_device in vortex_up().
>     
>     Also modify vortex_up to return error to callers. Handle failure of vortex_up in
>     vortex_open and vortex_resume.
>     
>     Signed-off-by: Mark Hindley <mark@hindley.org.uk>

Steffen, did you ACK this?  and/or going to resend it to me?

Re: [REVISED PATCH] 3c59x: check return of pci_enable_device()

[Steffen Klassert]

On Fri, Aug 31, 2007 at 09:08:37AM -0400, Jeff Garzik wrote:
> Mark Hindley wrote:
> >Revised patch for this.
> >
> >Mark
> >
> >
> >commit 5cf33391eba81a49038fa8be8cbad8425b80bf7f
> >Author: Mark Hindley <mark@hindley.org.uk>
> >Date:   Thu Aug 16 11:26:35 2007 +0100
> >
> >    Check return of pci_enable_device in vortex_up().
> >    
> >    Also modify vortex_up to return error to callers. Handle failure of 
> >    vortex_up in
> >    vortex_open and vortex_resume.
> >    
> >    Signed-off-by: Mark Hindley <mark@hindley.org.uk>
> 
> Steffen, did you ACK this?  and/or going to resend it to me?
> 

Yes, I did. Andrew has it already in -mm, 
I guess that he will resend it to you soon.

Steffen

Re: [REVISED PATCH] 3c59x: check return of pci_enable_device()

[Jeff Garzik]

Steffen Klassert wrote:
>>> commit 5cf33391eba81a49038fa8be8cbad8425b80bf7f
>>> Author: Mark Hindley <mark@hindley.org.uk>
>>> Date:   Thu Aug 16 11:26:35 2007 +0100
>>>
>>>    Check return of pci_enable_device in vortex_up().
>>>    
>>>    Also modify vortex_up to return error to callers. Handle failure of 
>>>    vortex_up in
>>>    vortex_open and vortex_resume.
>>>    
>>>    Signed-off-by: Mark Hindley <mark@hindley.org.uk>
>> Steffen, did you ACK this?  and/or going to resend it to me?

> Yes, I did. Andrew has it already in -mm, 
> I guess that he will resend it to you soon.


No need for a resend, I just wanted to make sure I wasn't stepping on 
your toes by applying this patch _instead of_ one that was going to be 
resent.

Re: [REVISED PATCH] 3c59x: check return of pci_enable_device()

[Jeff Garzik]

Mark Hindley wrote:
> Revised patch for this.
> 
> Mark
> 
> 
> commit 5cf33391eba81a49038fa8be8cbad8425b80bf7f
> Author: Mark Hindley <mark@hindley.org.uk>
> Date:   Thu Aug 16 11:26:35 2007 +0100
> 
>     Check return of pci_enable_device in vortex_up().
>     
>     Also modify vortex_up to return error to callers. Handle failure of vortex_up in
>     vortex_open and vortex_resume.
>     
>     Signed-off-by: Mark Hindley <mark@hindley.org.uk>

applied