[PATCH] vgaarb: use valid dev pointer in vgaarb_info()

[PATCH] vgaarb: use valid dev pointer in vgaarb_info()

[Arnd Bergmann]

We now pass the device to the debug messages, but on non-x86,
this is an invalid pointer in vga_arb_device_init:

drivers/gpu/vga/vgaarb.c: In function 'vga_arb_device_init':
drivers/gpu/vga/vgaarb.c:1467:4: error: 'dev' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This moves the initialization of the dev pointer outside of the
architecture #ifdef.

Fixes: a75d68f62106 ("vgaarb: Use dev_printk() when possible")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/vga/vgaarb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index b3d27182edd9..0f5b2dd24507 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -1407,7 +1407,6 @@ static int __init vga_arb_device_init(void)
 	int rc;
 	struct pci_dev *pdev;
 	struct vga_device *vgadev;
-	struct device *dev;
 
 	rc = misc_register(&vga_arb_device);
 	if (rc < 0)
@@ -1424,6 +1423,7 @@ static int __init vga_arb_device_init(void)
 		vga_arbiter_add_pci_device(pdev);
 
 	list_for_each_entry(vgadev, &vga_list, list) {
+		struct device *dev = &vgadev->pdev->dev;
 #if defined(CONFIG_X86) || defined(CONFIG_IA64)
 		/*
 		 * Override vga_arbiter_add_pci_device()'s I/O based detection
@@ -1438,7 +1438,6 @@ static int __init vga_arb_device_init(void)
 		int i;
 
 		limit = screen_info.lfb_base + screen_info.lfb_size;
-		dev = &vgadev->pdev->dev;
 
 		/* Does firmware framebuffer belong to us? */
 		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-- 
2.9.0

Re: [PATCH] vgaarb: use valid dev pointer in vgaarb_info()

[Daniel Vetter]

On Tue, Nov 22, 2016 at 03:34:19PM +0100, Arnd Bergmann wrote:
> We now pass the device to the debug messages, but on non-x86,
> this is an invalid pointer in vga_arb_device_init:
> 
> drivers/gpu/vga/vgaarb.c: In function 'vga_arb_device_init':
> drivers/gpu/vga/vgaarb.c:1467:4: error: 'dev' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> This moves the initialization of the dev pointer outside of the
> architecture #ifdef.
> 
> Fixes: a75d68f62106 ("vgaarb: Use dev_printk() when possible")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Applied, thx.
-Daniel

> ---
>  drivers/gpu/vga/vgaarb.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
> index b3d27182edd9..0f5b2dd24507 100644
> --- a/drivers/gpu/vga/vgaarb.c
> +++ b/drivers/gpu/vga/vgaarb.c
> @@ -1407,7 +1407,6 @@ static int __init vga_arb_device_init(void)
>  	int rc;
>  	struct pci_dev *pdev;
>  	struct vga_device *vgadev;
> -	struct device *dev;
>  
>  	rc = misc_register(&vga_arb_device);
>  	if (rc < 0)
> @@ -1424,6 +1423,7 @@ static int __init vga_arb_device_init(void)
>  		vga_arbiter_add_pci_device(pdev);
>  
>  	list_for_each_entry(vgadev, &vga_list, list) {
> +		struct device *dev = &vgadev->pdev->dev;
>  #if defined(CONFIG_X86) || defined(CONFIG_IA64)
>  		/*
>  		 * Override vga_arbiter_add_pci_device()'s I/O based detection
> @@ -1438,7 +1438,6 @@ static int __init vga_arb_device_init(void)
>  		int i;
>  
>  		limit = screen_info.lfb_base + screen_info.lfb_size;
> -		dev = &vgadev->pdev->dev;
>  
>  		/* Does firmware framebuffer belong to us? */
>  		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
> -- 
> 2.9.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch