Patchwork ks8851: Fix missing mutex_lock/unlock

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Submitter mjr@cs.wisc.edu
Date April 12, 2012, 11:15 p.m.
Message ID <1334272530-11119-1-git-send-email-mjr@cs.wisc.edu>
Download mbox | patch
Permalink /patch/152197/
State Superseded
Delegated to: David Miller
Headers show

Comments

mjr@cs.wisc.edu - April 12, 2012, 11:15 p.m.
From: Matt Renzelmann <mjr@cs.wisc.edu>

All calls to ks8851_rdreg* and ks8851_wrreg* should be protected with
the driver's lock mutex.  A spurious interrupt may otherwise cause a
crash.  Thanks to Stephen Boyd, Flavio Leitner, and Ben Hutchings for
feedback.

Signed-off-by: Matt Renzelmann <mjr@cs.wisc.edu>
---

This modified version incorporates Ben Hutchings' bugfix by removing
the incorrect call to CIDER_REV_GET.

 drivers/net/ethernet/micrel/ks8851.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
Flavio Leitner - April 13, 2012, 12:22 a.m.
On Thu, 12 Apr 2012 18:15:30 -0500
mjr@cs.wisc.edu wrote:

> From: Matt Renzelmann <mjr@cs.wisc.edu>
> 
> All calls to ks8851_rdreg* and ks8851_wrreg* should be protected with
> the driver's lock mutex.  A spurious interrupt may otherwise cause a
> crash.  Thanks to Stephen Boyd, Flavio Leitner, and Ben Hutchings for
> feedback.
> 
> Signed-off-by: Matt Renzelmann <mjr@cs.wisc.edu>
> ---
> 
> This modified version incorporates Ben Hutchings' bugfix by removing
> the incorrect call to CIDER_REV_GET.
> 
>  drivers/net/ethernet/micrel/ks8851.c |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
> index c722aa6..e5dc075 100644
> --- a/drivers/net/ethernet/micrel/ks8851.c
> +++ b/drivers/net/ethernet/micrel/ks8851.c
> @@ -1418,6 +1418,7 @@ static int __devinit ks8851_probe(struct spi_device *spi)
>  	struct net_device *ndev;
>  	struct ks8851_net *ks;
>  	int ret;
> +	unsigned cider;


Basically what I have proposed, but I used 'unsigned int cider'.
Anyway, the driver uses just 'unsigned' everywhere.

Signed-off-by: Flavio Leitner <fbl@redhat.com>

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Stephen Boyd - April 13, 2012, 5:46 p.m.
On 04/12/12 16:15, mjr@cs.wisc.edu wrote:
> From: Matt Renzelmann <mjr@cs.wisc.edu>
>
> All calls to ks8851_rdreg* and ks8851_wrreg* should be protected with
> the driver's lock mutex.  A spurious interrupt may otherwise cause a
> crash. 

This doesn't make any sense anymore because you don't do any mutex things.

>  Thanks to Stephen Boyd, Flavio Leitner, and Ben Hutchings for
> feedback.
>
> Signed-off-by: Matt Renzelmann <mjr@cs.wisc.edu>
> ---
>
> This modified version incorporates Ben Hutchings' bugfix by removing
> the incorrect call to CIDER_REV_GET.
>
>  drivers/net/ethernet/micrel/ks8851.c |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
> index c722aa6..e5dc075 100644
> --- a/drivers/net/ethernet/micrel/ks8851.c
> +++ b/drivers/net/ethernet/micrel/ks8851.c
> @@ -1418,6 +1418,7 @@ static int __devinit ks8851_probe(struct spi_device *spi)
>  	struct net_device *ndev;
>  	struct ks8851_net *ks;
>  	int ret;
> +	unsigned cider;
>  
>  	ndev = alloc_etherdev(sizeof(struct ks8851_net));
>  	if (!ndev)
> @@ -1484,8 +1485,8 @@ static int __devinit ks8851_probe(struct spi_device *spi)
>  	ks8851_soft_reset(ks, GRR_GSR);
>  
>  	/* simple check for a valid chip being connected to the bus */
> -
> -	if ((ks8851_rdreg16(ks, KS_CIDER) & ~CIDER_REV_MASK) != CIDER_ID) {
> +	cider = ks8851_rdreg16(ks, KS_CIDER);
> +	if ((cider & ~CIDER_REV_MASK) != CIDER_ID) {
>  		dev_err(&spi->dev, "failed to read device ID\n");
>  		ret = -ENODEV;
>  		goto err_id;
> @@ -1516,8 +1517,7 @@ static int __devinit ks8851_probe(struct spi_device *spi)
>  	}
>  
>  	netdev_info(ndev, "revision %d, MAC %pM, IRQ %d, %s EEPROM\n",
> -		    CIDER_REV_GET(ks8851_rdreg16(ks, KS_CIDER)),
> -		    ndev->dev_addr, ndev->irq,
> +		    CIDER_REV_GET(cider), ndev->dev_addr, ndev->irq,
>  		    ks->rc_ccr & CCR_EEPROM ? "has" : "no");
>  
>  	return 0;

Patch

diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
index c722aa6..e5dc075 100644
--- a/drivers/net/ethernet/micrel/ks8851.c
+++ b/drivers/net/ethernet/micrel/ks8851.c
@@ -1418,6 +1418,7 @@  static int __devinit ks8851_probe(struct spi_device *spi)
 	struct net_device *ndev;
 	struct ks8851_net *ks;
 	int ret;
+	unsigned cider;
 
 	ndev = alloc_etherdev(sizeof(struct ks8851_net));
 	if (!ndev)
@@ -1484,8 +1485,8 @@  static int __devinit ks8851_probe(struct spi_device *spi)
 	ks8851_soft_reset(ks, GRR_GSR);
 
 	/* simple check for a valid chip being connected to the bus */
-
-	if ((ks8851_rdreg16(ks, KS_CIDER) & ~CIDER_REV_MASK) != CIDER_ID) {
+	cider = ks8851_rdreg16(ks, KS_CIDER);
+	if ((cider & ~CIDER_REV_MASK) != CIDER_ID) {
 		dev_err(&spi->dev, "failed to read device ID\n");
 		ret = -ENODEV;
 		goto err_id;
@@ -1516,8 +1517,7 @@  static int __devinit ks8851_probe(struct spi_device *spi)
 	}
 
 	netdev_info(ndev, "revision %d, MAC %pM, IRQ %d, %s EEPROM\n",
-		    CIDER_REV_GET(ks8851_rdreg16(ks, KS_CIDER)),
-		    ndev->dev_addr, ndev->irq,
+		    CIDER_REV_GET(cider), ndev->dev_addr, ndev->irq,
 		    ks->rc_ccr & CCR_EEPROM ? "has" : "no");
 
 	return 0;