From: Arnd Bergmann <arnd@arndb.de>

The errno.h header is not always included indirectly, leading
to rare randconfig build warnings.

drivers/media/pci/mgb4/mgb4_regs.c:20:11: error: use of undeclared identifier 'EINVAL'
   20 |                 return -EINVAL;

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/media/pci/mgb4/mgb4_regs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/pci/mgb4/mgb4_regs.c b/drivers/media/pci/mgb4/mgb4_regs.c
index 31befd722d72..b45537dbfafa 100644
--- a/drivers/media/pci/mgb4/mgb4_regs.c
+++ b/drivers/media/pci/mgb4/mgb4_regs.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/ioport.h>
+#include <linux/errno.h>
 #include "mgb4_regs.h"
 
 int mgb4_regs_map(struct resource *res, struct mgb4_regs *regs)
-- 
2.39.5

On 07. 03. 25 11:24 dop., Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The errno.h header is not always included indirectly, leading
> to rare randconfig build warnings.
> 
> drivers/media/pci/mgb4/mgb4_regs.c:20:11: error: use of undeclared identifier 'EINVAL'
>     20 |                 return -EINVAL;
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>   drivers/media/pci/mgb4/mgb4_regs.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/pci/mgb4/mgb4_regs.c b/drivers/media/pci/mgb4/mgb4_regs.c
> index 31befd722d72..b45537dbfafa 100644
> --- a/drivers/media/pci/mgb4/mgb4_regs.c
> +++ b/drivers/media/pci/mgb4/mgb4_regs.c
> @@ -5,6 +5,7 @@
>    */
>   
>   #include <linux/ioport.h>
> +#include <linux/errno.h>
>   #include "mgb4_regs.h"
>   
>   int mgb4_regs_map(struct resource *res, struct mgb4_regs *regs)

Acked-by: Martin Tůma <martin.tuma@digiteqautomotive.com>