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Subject[PATCH] PCI: dwc: designware: don't sleep in atomic context
Date
In pcie-designware.c many places we are calling "usleep_range" which
are in atomic context. This patch fixes these potential BUGs and
replaces "usleep_range" with mdelay calls.

Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
---
drivers/pci/dwc/pcie-designware.c | 8 ++++----
drivers/pci/dwc/pcie-designware.h | 3 +--
2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
index 88abddd..35d19b9 100644
--- a/drivers/pci/dwc/pcie-designware.c
+++ b/drivers/pci/dwc/pcie-designware.c
@@ -138,7 +138,7 @@ static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index,
if (val & PCIE_ATU_ENABLE)
return;

- usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
+ mdelay(LINK_WAIT_IATU_MIN);
}
dev_err(pci->dev, "outbound iATU is not being enabled\n");
}
@@ -181,7 +181,7 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
if (val & PCIE_ATU_ENABLE)
return;

- usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
+ mdelay(LINK_WAIT_IATU_MIN);
}
dev_err(pci->dev, "outbound iATU is not being enabled\n");
}
@@ -239,7 +239,7 @@ static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, int index,
if (val & PCIE_ATU_ENABLE)
return 0;

- usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
+ mdelay(LINK_WAIT_IATU_MIN);
}
dev_err(pci->dev, "inbound iATU is not being enabled\n");

@@ -285,7 +285,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
if (val & PCIE_ATU_ENABLE)
return 0;

- usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
+ mdelay(LINK_WAIT_IATU_MIN);
}
dev_err(pci->dev, "inbound iATU is not being enabled\n");

diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
index e5d9d77..13c17c9 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -28,8 +28,7 @@

/* Parameters for the waiting for iATU enabled routine */
#define LINK_WAIT_MAX_IATU_RETRIES 5
-#define LINK_WAIT_IATU_MIN 9000
-#define LINK_WAIT_IATU_MAX 10000
+#define LINK_WAIT_IATU_MIN 9

/* Synopsys-specific PCIe configuration registers */
#define PCIE_PORT_LINK_CONTROL 0x710
--
2.7.4
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