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Char: cyclades, allow DEBUG_SHIRQ

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Test if base addr is non-null in ISR to prove the card has been correctly
initialized.  This is needed for DEBUG_SHIRQ for example.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiri Slaby
2007-05-08 00:36:24 -07:00
committed by Linus Torvalds
parent 85c93fa95b
commit f1e83c6c1e
1 changed files with 4 additions and 0 deletions
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4
drivers/char/cyclades.c
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@@ -1444,6 +1444,10 @@ static irqreturn_t cyy_interrupt(int irq, void *dev_id)
card_base_addr = cinfo->base_addr; card_base_addr = cinfo->base_addr;
index = cinfo->bus_index; index = cinfo->bus_index;
/* card was not initialized yet (e.g. DEBUG_SHIRQ) */
if (unlikely(card_base_addr == NULL))
return IRQ_HANDLED;
/* This loop checks all chips in the card. Make a note whenever /* This loop checks all chips in the card. Make a note whenever
_any_ chip had some work to do, as this is considered an _any_ chip had some work to do, as this is considered an
indication that there will be more to do. Only when no chip indication that there will be more to do. Only when no chip