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ALSA: cs4236: fix error return comparison of an unsigned integer

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commit d60229d848 upstream.

The return from pnp_irq is an unsigned integer type resource_size_t
and hence the error check for a positive non-error code is always
going to be true.  A check for a non-failure return from pnp_irq
should in fact be for (resource_size_t)-1 rather than >= 0.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: a9824c868a ("[ALSA] Add CS4232 PnP BIOS support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20191122131354.58042-1-colin.king@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Ian King 2019-11-22 13:13:54 +00:00 committed by Greg Kroah-Hartman
parent ebf3afa3cb
commit aea6343885
1 changed files with 2 additions and 1 deletions
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3
sound/isa/cs423x/cs4236.c
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@ -278,7 +278,8 @@ static int snd_cs423x_pnp_init_mpu(int dev, struct pnp_dev *pdev)
} else {
mpu_port[dev] = pnp_port_start(pdev, 0);
if (mpu_irq[dev] >= 0 &&
pnp_irq_valid(pdev, 0) && pnp_irq(pdev, 0) >= 0) {
pnp_irq_valid(pdev, 0) &&
pnp_irq(pdev, 0) != (resource_size_t)-1) {
mpu_irq[dev] = pnp_irq(pdev, 0);
} else {
mpu_irq[dev] = -1; /* disable interrupt */