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PCI: imx6: Fix imprecise abort handler

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An imprecise abort is triggered when a port behind a switch is accessed
and no device is present.  At enumeration, imprecise aborts are not enabled
thus this ends up getting deferred until the kernel has completed init.  At
that point we must not adjust PC - the handler must do nothing, but a
handler must exist.

This fixes random crashes that occur right after freeing init.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Tim Harvey 2013-10-17 17:27:22 -07:00 committed by Bjorn Helgaas
parent 9b5cd0948b
commit 4ec3ed7f5e
1 changed files with 0 additions and 6 deletions
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6
drivers/pci/host/pci-imx6.c
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@ -200,12 +200,6 @@ static int pcie_phy_write(void __iomem *dbi_base, int addr, int data)
static int imx6q_pcie_abort_handler(unsigned long addr,
unsigned int fsr, struct pt_regs *regs)
{
/*
* If it was an imprecise abort, then we need to correct the
* return address to be _after_ the instruction.
*/
if (fsr & (1 << 10))
regs->ARM_pc += 4;
return 0;
}