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irqchip: armada-370-xp: fix invalid cast of signed value into unsigned variable

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The armada_370_xp_alloc_msi() function returns a signed int, which is
negative on error. However, we store the return value into an
irq_hw_number_t, which is unsigned. Therefore, we actually never test
if armada_370_xp_alloc_msi() returns an error or not, which may lead
us to use hwirq numbers of as 0xffffffe4 (when
armada_370_xp_alloc_msi() returns -ENOSPC).

This commit fixes that by storing the return value of
armada_370_xp_alloc_msi() in a signed variable.

Fixes: 31f614edb7 ('irqchip: armada-370-xp: implement MSI support')
Cc: <stable@vger.kernel.org> # v3.13+
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1397823593-1932-2-git-send-email-thomas.petazzoni@free-electrons.com
Tested-by: Neil Greatorex <neil@fatboyfat.co.uk>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Thomas Petazzoni 2014-04-18 14:19:47 +02:00 committed by Jason Cooper
parent c9eaa447e7
commit da343fc776
1 changed files with 1 additions and 2 deletions
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3
drivers/irqchip/irq-armada-370-xp.c
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@ -132,8 +132,7 @@ static int armada_370_xp_setup_msi_irq(struct msi_chip *chip,
struct msi_desc *desc)
{
struct msi_msg msg;
irq_hw_number_t hwirq;
int virq;
int virq, hwirq;
hwirq = armada_370_xp_alloc_msi();
if (hwirq < 0)