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>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/memory/tegra30-mc.c b/drivers/memory/tegra30-mc.c
index f4ae074badc3..58d2979b4035 100644
--- a/drivers/memory/tegra30-mc.c
+++ b/drivers/memory/tegra30-mc.c
@@ -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;
 }