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floppy: tolerate DMA channel unavailability 

The floppy driver is already written to be able to operate in virtual DMA
mode.  Thus it can easily be adjusted to tolerate failure from
fd_request_dma() as long as virtual DMA mode is not disallowed.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Beulich 2007-10-16 23:27:32 -07:00 committed by Linus Torvalds
parent e98c320291
commit 2e9c47cd4d
1 changed files with 9 additions and 5 deletions
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14
drivers/block/floppy.c
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@ -4388,11 +4388,15 @@ static int floppy_grab_irq_and_dma(void)
if (fd_request_dma()) {
DPRINT("Unable to grab DMA%d for the floppy driver\n",
FLOPPY_DMA);
fd_free_irq();
spin_lock_irqsave(&floppy_usage_lock, flags);
usage_count--;
spin_unlock_irqrestore(&floppy_usage_lock, flags);
return -1;
if (can_use_virtual_dma & 2)
use_virtual_dma = can_use_virtual_dma = 1;
if (!(can_use_virtual_dma & 1)) {
fd_free_irq();
spin_lock_irqsave(&floppy_usage_lock, flags);
usage_count--;
spin_unlock_irqrestore(&floppy_usage_lock, flags);
return -1;
}
}
for (fdc = 0; fdc < N_FDC; fdc++) {