linux-kernel - Re: [PATCH 11/14] efi/gop: Allow specifying mode number on command line

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Date:   Fri, 20 Mar 2020 13:51:07 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     kbuild@...ts.01.org, Arvind Sankar <nivedita@...m.mit.edu>,
        kbuild-all@...ts.01.org, Ard Biesheuvel <ardb@...nel.org>,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/14] efi/gop: Allow specifying mode number on command
 line

On Fri, Mar 20, 2020 at 05:36:04PM +0300, Dan Carpenter wrote:
> Hi Arvind,
> 
> Thank you for the patch! Perhaps something to improve:
> 
> url:    https://github.com/0day-ci/linux/commits/Arvind-Sankar/efi-gop-Refactoring-mode-setting-feature/20200320-044605
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git next
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> New smatch warnings:
> drivers/firmware/efi/libstub/gop.c:113 set_mode() error: uninitialized symbol 'new_mode'.
> 
> # https://github.com/0day-ci/linux/commit/af85e496c9f577df9743784171b1cda94220dd8f
> git remote add linux-review https://github.com/0day-ci/linux
> git remote update linux-review
> git checkout af85e496c9f577df9743784171b1cda94220dd8f
> vim +/info +85 drivers/firmware/efi/libstub/gop.c
> 
> af85e496c9f577 Arvind Sankar 2020-03-19   97  static void set_mode(efi_graphics_output_protocol_t *gop)
> af85e496c9f577 Arvind Sankar 2020-03-19   98  {
> af85e496c9f577 Arvind Sankar 2020-03-19   99  	efi_graphics_output_protocol_mode_t *mode;
> af85e496c9f577 Arvind Sankar 2020-03-19  100  	u32 cur_mode, new_mode;
> af85e496c9f577 Arvind Sankar 2020-03-19  101  
> af85e496c9f577 Arvind Sankar 2020-03-19  102  	switch (cmdline.option) {
> af85e496c9f577 Arvind Sankar 2020-03-19  103  	case EFI_CMDLINE_NONE:
> af85e496c9f577 Arvind Sankar 2020-03-19  104  		return;
> af85e496c9f577 Arvind Sankar 2020-03-19  105  	case EFI_CMDLINE_MODE_NUM:
> af85e496c9f577 Arvind Sankar 2020-03-19  106  		new_mode = choose_mode_modenum(gop);
> af85e496c9f577 Arvind Sankar 2020-03-19  107  		break;
> 
> No default case?

Yeah, it's an enum with the only two values covered by the switch cases,
so it's really a bogus warning. I posted a v2 with a default case
instead anyway to silence it.

> 
> af85e496c9f577 Arvind Sankar 2020-03-19  108  	}
> af85e496c9f577 Arvind Sankar 2020-03-19  109  
> af85e496c9f577 Arvind Sankar 2020-03-19  110  	mode = efi_table_attr(gop, mode);
> af85e496c9f577 Arvind Sankar 2020-03-19  111  	cur_mode = efi_table_attr(mode, mode);
> af85e496c9f577 Arvind Sankar 2020-03-19  112  
> af85e496c9f577 Arvind Sankar 2020-03-19 @113  	if (new_mode == cur_mode)
> af85e496c9f577 Arvind Sankar 2020-03-19  114  		return;
> af85e496c9f577 Arvind Sankar 2020-03-19  115  
> af85e496c9f577 Arvind Sankar 2020-03-19  116  	if (efi_call_proto(gop, set_mode, new_mode) != EFI_SUCCESS)
> af85e496c9f577 Arvind Sankar 2020-03-19  117  		efi_printk("Failed to set requested mode\n");
> af85e496c9f577 Arvind Sankar 2020-03-19  118  }
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org