support for VGA devices on I/O hoses other than 0 in the Alpha archit…

[WesleyA0101]

Null Pointer Checks:
Added checks to ensure that critical pointers, such as hwrpb and pu64, are not null, preventing runtime failures.

Use of Macros for Constants:
Replaced hardcoded values (such as 0x3C0 and 0x3DF) with macros (VGA_IO_START and VGA_IO_END), improving readability and facilitating future changes.

Simplification of the default_vga_hose_select Function:
The function was simplified to a single line, making it more concise and easier to understand.

Error Checking in request_resource:
Added a check to ensure that the I/O resource is successfully allocated. If not, an error message is displayed, and the function returns early.

Use of Appropriate Log Levels:
Log messages were updated to use appropriate levels (KERN_ERR for errors and KERN_INFO for informational messages), facilitating debugging and monitoring.

Structuring the for Loop in locate_and_init_vga:
The loop that iterates over PCI devices was simplified, improving readability and reducing code complexity.

Addition of const for Function Pointers:
The function pointer sel_func was marked as const to indicate that it does not modify the pointed data, increasing code safety.

Resource Verification and Error Handling:
Added additional checks to ensure that necessary resources are available before proceeding with VGA initialization.
OBS: I unfortunately could not test at the moment

[KernelPRBot]

Hi @WesleyA0101!

Thanks for your contribution to the Linux kernel!

Linux kernel development happens on mailing lists, rather than on GitHub - this GitHub repository is a read-only mirror that isn't used for accepting contributions. So that your change can become part of Linux, please email it to us as a patch.

Sending patches isn't quite as simple as sending a pull request, but fortunately it is a well documented process.

Here's what to do:

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The Linux kernel community is notoriously picky about how contributions are formatted and sent. Fortunately, they have documented their expectations.

Firstly, all contributions need to be formatted as patches. A patch is a plain text document showing the change you want to make to the code, and documenting why it is a good idea.

You can create patches with git format-patch.

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Thirdly, changes have some technical requirements. There is a Linux kernel coding style, and there are licensing requirements you need to comply with.

Both of these are documented in the Submitting Patches documentation that is part of the kernel.

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If you don't already know what subsystem your change belongs to, the get_maintainer.pl script in the kernel source can help you.

get_maintainer.pl will take the patch or patches you created in the previous step, and tell you who is responsible for them, and what mailing lists are used. You can also take a look at the MAINTAINERS file by hand.

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It's not usually necessary to subscribe to the mailing list before you send the patches, but if you're interested in kernel development, subscribing to a subsystem mailing list is a good idea. (At this point, you probably don't need to subscribe to LKML - it is a very high traffic list with about a thousand messages per day, which is often not useful for beginners.)

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Use git send-email, which will ensure that your patches are formatted in the standard manner. In order to use git send-email, you'll need to configure git to use your SMTP email server.

For more information about using git send-email, look at the Git documentation or type git help send-email. There are a number of useful guides and tutorials about git send-email that can be found on the internet.

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Many issues - especially about how to use certain tools - can be resolved by using your favourite internet search engine.

If you can't find an answer, there are a few places you can turn:

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I sent my patch - now what?

You wait.

You can check that your email has been received by checking the mailing list archives for the mailing list you sent your patch to. Messages may not be received instantly, so be patient. Kernel developers are generally very busy people, so it may take a few weeks before your patch is looked at.

Then, you keep waiting. Three things may happen:

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Further information

• Working with the kernel development community - the official documentation for new kernel contributors

Happy hacking!

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