Re: [PATCH v2] video: fbdev: uvesafb.c: Added additional error checking

From: Wang YanQing
Date: Thu Jul 24 2014 - 13:37:55 EST

On Wed, Jul 23, 2014 at 11:20:27PM +0200, Rickard Strandqvist wrote:
> Variable was assigned a value that is never used.
> Now the variable is used, and the function returns if a call to
> uvesafb_exec() returns a error.

Because the only user of uvesafb_vbe_getpmi in uvesafb.c
don't check its return value, it should do the check indeed,
so maybe below change is better:

- if ((task->t.regs.eax & 0xffff) != 0x4f || task-> < 0xc000) {
+ if (err || (task->t.regs.eax & 0xffff) != 0x4f || task-> < 0xc000) {
par->pmi_setpal = par->ypan = 0;

Or we check uvesafb_vbe_getpmi's return value, then the code will looks like below:

if (uvesafb_vbe_getpmi(task, par))
par->pmi_setpal = par->ypan = 0;

Add cc:pavel@xxxxxx, you should cc all the people who replied your patch
in later patch version.

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