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powerpc/powernv: Disable interrupts while taking phb->lock

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We need to disable interrupts when taking the phb->lock. Otherwise
we could deadlock with pci_lock taken from an interrupt.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2012-02-12 14:28:20 +00:00 committed by Benjamin Herrenschmidt
parent 6fe5f5f3ff
commit f1c853b53c
1 changed files with 14 additions and 8 deletions
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22
arch/powerpc/platforms/powernv/pci.c
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@ -52,32 +52,38 @@ static int pnv_msi_check_device(struct pci_dev* pdev, int nvec, int type)
static unsigned int pnv_get_one_msi(struct pnv_phb *phb) static unsigned int pnv_get_one_msi(struct pnv_phb *phb)
{ {
unsigned int id; unsigned long flags;
unsigned int id, rc;
spin_lock_irqsave(&phb->lock, flags);
spin_lock(&phb->lock);
id = find_next_zero_bit(phb->msi_map, phb->msi_count, phb->msi_next); id = find_next_zero_bit(phb->msi_map, phb->msi_count, phb->msi_next);
if (id >= phb->msi_count && phb->msi_next) if (id >= phb->msi_count && phb->msi_next)
id = find_next_zero_bit(phb->msi_map, phb->msi_count, 0); id = find_next_zero_bit(phb->msi_map, phb->msi_count, 0);
if (id >= phb->msi_count) { if (id >= phb->msi_count) {
spin_unlock(&phb->lock); rc = 0;
return 0; goto out;
} }
__set_bit(id, phb->msi_map); __set_bit(id, phb->msi_map);
spin_unlock(&phb->lock); rc = id + phb->msi_base;
return id + phb->msi_base; out:
spin_unlock_irqrestore(&phb->lock, flags);
return rc;
} }
static void pnv_put_msi(struct pnv_phb *phb, unsigned int hwirq) static void pnv_put_msi(struct pnv_phb *phb, unsigned int hwirq)
{ {
unsigned long flags;
unsigned int id; unsigned int id;
if (WARN_ON(hwirq < phb->msi_base || if (WARN_ON(hwirq < phb->msi_base ||
hwirq >= (phb->msi_base + phb->msi_count))) hwirq >= (phb->msi_base + phb->msi_count)))
return; return;
id = hwirq - phb->msi_base; id = hwirq - phb->msi_base;
spin_lock(&phb->lock);
spin_lock_irqsave(&phb->lock, flags);
__clear_bit(id, phb->msi_map); __clear_bit(id, phb->msi_map);
spin_unlock(&phb->lock); spin_unlock_irqrestore(&phb->lock, flags);
} }
static int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) static int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)