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ahci: fix nvec check

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commit 17a51f12 ("ahci: only try to use multi-MSI mode if there is more
than 1 port") lead to a case where nvec isn't initialized before it's
used.  Fix this by moving the check into the n_ports conditional.

Reported-and-reviewed-by Colin Ian King <colin.king@canonical.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Christoph Hellwig 2016-10-20 17:15:41 +02:00 committed by Tejun Heo
parent 17a51f12cf
commit a478b09747
1 changed files with 7 additions and 7 deletions
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14
drivers/ata/ahci.c
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@ -1436,14 +1436,14 @@ static int ahci_init_msi(struct pci_dev *pdev, unsigned int n_ports,
"ahci: MRSM is on, fallback to single MSI\n");
pci_free_irq_vectors(pdev);
}
}
/*
* -ENOSPC indicated we don't have enough vectors. Don't bother trying
* a single vectors for any other error:
*/
if (nvec < 0 && nvec != -ENOSPC)
return nvec;
/*
* -ENOSPC indicated we don't have enough vectors. Don't bother
* trying a single vectors for any other error:
*/
if (nvec < 0 && nvec != -ENOSPC)
return nvec;
}
/*
* If the host is not capable of supporting per-port vectors, fall