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parport_pc: make sure to release IO ports after probing for IT87XX 

Commit f63fd7e299 ("parport_pc: detection
for SuperIO IT87XX POST") only released the IO port region on success,
not when the probe for the IT87XX chip failed.

That caused not only a reserved region to leak, but also caused an oops
when the driver module was unloaded and somebody tried to cat
/proc/ioports - because the string that was assigned to the IO port
region was a static string in the module virtual address area.

Reported-by: Lubos Lunak <l.lunak@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Petr Cvek <petr.cvek@tul.cz>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2008-04-04 14:30:31 -07:00
parent e315c121a8
commit 4ed919014e
1 changed files with 1 additions and 2 deletions
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3
drivers/parport/parport_pc.c
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@ -1568,9 +1568,8 @@ static void __devinit detect_and_report_it87(void)
outb(r | 8, 0x2F); outb(r | 8, 0x2F);
outb(0x02, 0x2E); /* Lock */ outb(0x02, 0x2E); /* Lock */
outb(0x02, 0x2F); outb(0x02, 0x2F);
release_region(0x2e, 1);
} }
release_region(0x2e, 1);
} }
#endif /* CONFIG_PARPORT_PC_SUPERIO */ #endif /* CONFIG_PARPORT_PC_SUPERIO */