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memory: tegra30-mc: Fix IRQ handler. 

In Tegra30 any memory controller interrupt would cause an infinite loop in the
IRQ handler. Additionally, a garbage pointer was used to read the MC
status registers, which causes wrong values to be printed if a MC error
occurred.

Signed-off-by: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tuomas Tynkkynen 2013-06-11 13:11:19 +03:00 committed by Greg Kroah-Hartman
parent d777f98bfa
commit 36dd68319c
1 changed files with 6 additions and 3 deletions
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9
drivers/memory/tegra30-mc.c
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@ -218,7 +218,7 @@ static void tegra30_mc_decode(struct tegra30_mc *mc, int n)
return;
}
err = readl(mc + MC_ERR_STATUS);
err = mc_readl(mc, MC_ERR_STATUS);
type = (err & MC_ERR_TYPE_MASK) >> MC_ERR_TYPE_SHIFT;
perm = (err & MC_ERR_INVALID_SMMU_PAGE_MASK) >>
@ -235,7 +235,7 @@ static void tegra30_mc_decode(struct tegra30_mc *mc, int n)
if (cid < ARRAY_SIZE(tegra30_mc_client))
client = tegra30_mc_client[cid];
addr = readl(mc + MC_ERR_ADR);
addr = mc_readl(mc, MC_ERR_ADR);
dev_err_ratelimited(mc->dev, "%s (0x%08x): 0x%08x %s (%s %s %s %s)\n",
mc_int_err[idx], err, addr, client,
@ -313,8 +313,11 @@ static irqreturn_t tegra30_mc_isr(int irq, void *data)
mask &= stat;
if (!mask)
return IRQ_NONE;
while ((bit = ffs(mask)) != 0)
while ((bit = ffs(mask)) != 0) {
tegra30_mc_decode(mc, bit - 1);
mask &= ~BIT(bit - 1);
}
mc_writel(mc, stat, MC_INTSTATUS);
return IRQ_HANDLED;
}