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SubjectRe: [PATCH 2/2] floppy: error handling fixes on do_floppy_init
On Wed, Aug 08, 2012 at 03:57:30PM -0400, Vivek Goyal wrote:
> On Wed, Aug 08, 2012 at 03:24:53PM -0300, Herton Ronaldo Krzesinski wrote:
> > While looking at commit 3f9a5aa ("floppy: Cleanup disk->queue before
> > caling put_disk() if add_disk() was never called") I noticed some
> > problems with the error handling and cleanup:
> >
> > * missing cleanup (put_disk) if blk_init_queue fails, dr is decremented
> > first in the error handling loop
> > * if something fails in the add_disk loop, there is no cleanup of
> > previous iterations in the error handling.
> > * "if (disks[dr]->queue)" check is bogus, when reaching there for each
> > dr should exist an queue allocated, and it doesn't take into account
> > iterations where add_disk wasn't done, if failure happens in add_disk
> > loop.
> > * floppy_module_exit doesn't reset queue pointer if add_disk wasn't
> > done.
>
> Hey, these seem to be multiple cleanups. Can you break these down into
> individual patches. Review becomes easy.

I'll resend with the fixes broken up.

>
> [..]
> > + blk_cleanup_queue(disks[dr]->queue);
> > + /*
> > + * put_disk() may not be paired with add_disk() and
> > + * will put queue reference one extra time. fix it.
> > + */
> > + if (dr > registered || !(allowed_drive_mask & (1 << dr)) ||
> > + fdc_state[FDC(dr)].version == FDC_NONE)
> > disks[dr]->queue = NULL;
>
> I think checking for FDC_NONE and allowed_drive_mask() in multiple places
> is becoming unreadable now. Can we just maintain a separate array to keep
> track of disks on which we have called add_disk() and do the cleanup
> accordingly.
>
> static unsigned short disk_registered[N_DRIVE];
>
> /* do add_disk */
> disk_registered[drive] = 1;
>
>
> out_put_disk:
> while(dr--) {
> if (disks[dr]->queue && !disk_registered[dr]) {
> blk_cleanup_queue()
> disks[dr]->queue = NULL;
> }
> }
>
> Same disk_registered[] can be used for your other loop of remove drives.
> Also it can be used in cleaning up code in floppy_module_exit().
>
> I think this will make code much more readable. Right now this error
> handling loop is just getting too complicated.

Complicated as many other code in the kernel :), but yes, we can do
better here, your proposed solution looks good, I'll redo the changes
with it, thanks for the review.

>
> Thanks
> Vivek
>

--
[]'s
Herton


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