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m68k/atari - ide: do not register interrupt if host->get_lock is set

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On m68k, host->get_lock is used to both lock and register the interrupt
that the IDE host shares with other device drivers. Registering the
IDE interrupt handler in ide-probe.c results in duplicating the
interrupt registered (once via host->get lock, and also via init_irq()),
and may result in IDE accepting interrupts even when another driver has
locked the interrupt hardware. This opens the whole locking scheme up
to races.

host->get_lock is set on m68k only, so other drivers' behaviour is not
changed.

Signed-off-by: Michael Schmitz <schmitz@debian.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: linux-ide@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Schmitz 2014-02-01 13:48:13 +13:00 committed by David S. Miller
parent 0c0bd34a14
commit a259d53205
1 changed files with 5 additions and 3 deletions
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8
drivers/ide/ide-probe.c
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@ -853,8 +853,9 @@ static int init_irq (ide_hwif_t *hwif)
if (irq_handler == NULL)
irq_handler = ide_intr;
if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
goto out_up;
if (!host->get_lock)
if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
goto out_up;
#if !defined(__mc68000__)
printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
@ -1533,7 +1534,8 @@ static void ide_unregister(ide_hwif_t *hwif)
ide_proc_unregister_port(hwif);
free_irq(hwif->irq, hwif);
if (!hwif->host->get_lock)
free_irq(hwif->irq, hwif);
device_unregister(hwif->portdev);
device_unregister(&hwif->gendev);