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[PATCH] ARM: 2694/1: [s3c2410/dma] release irq properly to fix kernel oops 

Patch from Albrecht Dre

Problem:
When a module requests a DMA channel via the function s3c2410_dma_request(), this function requests the appropriate irq under the name of the client module. When the client module is unloaded, it calls s3c2410_dma_free() which does not free the irq. Consequently, when e.g. running "cat /proc/interrupts", the irq owner points to freed memory, leading to a kernel oops.
File:
linux/arch/arm/mach-s3c2410/dma.c
Fix:
trivial, below

Signed-off-by: Albrecht Dre
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Albrecht Dre 2005-06-03 20:52:26 +01:00 committed by Russell King
parent 4ab5c01c7c
commit 105bb2698b
1 changed files with 4 additions and 0 deletions
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4
arch/arm/mach-s3c2410/dma.c
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@ -785,6 +785,10 @@ int s3c2410_dma_free(dmach_t channel, s3c2410_dma_client_t *client)
chan->client = NULL; chan->client = NULL;
chan->in_use = 0; chan->in_use = 0;
if (chan->irq_claimed)
free_irq(chan->irq, (void *)chan);
chan->irq_claimed = 0;
local_irq_restore(flags); local_irq_restore(flags);
return 0; return 0;