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Message-ID: <1449042196-25710-1-git-send-email-sanjeev_sharma@mentor.com>
Date: Wed, 2 Dec 2015 13:13:16 +0530
From: Sanjeev Sharma <sanjeev_sharma@...tor.com>
To: <Richard.Zhu@...escale.com>, <l.stach@...gutronix.de>
CC: <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>,
David Mueller <dave.mueller@....ch>,
Sanjeev Sharma <sanjeev_sharma@...tor.com>
Subject: [PATCH v2] PCI: imx6:don't sleep in atomic context
From: David Mueller <dave.mueller@....ch>
If additional PCIe switch get connected between the
host and the NIC,the kernel crashes with "BUG:
scheduling while atomic". To handle this we need to
call mdelay() instead of usleep_range().
This is currently called from atomic context through
pci_config_{read,write).
For more detail please refer bugzilla.kernel.org, Bug
100031
Signed-off-by: David Mueller <dave.mueller@....ch>
Signed-off-by: Sanjeev Sharma <sanjeev_sharma@...tor.com>
Changes in v2:
-order of signoff has been change
-Author of patch has been change
-A mdelay(1000) is different timescale than
a usleep(1000).change it to correct scale i.e mdelay(1)
-updated comment
---
drivers/pci/host/pci-imx6.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 233a196..c03527f 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -499,7 +499,7 @@ static int imx6_pcie_link_up(struct pcie_port *pp)
* Wait a little bit, then re-check if the link finished
* the training.
*/
- usleep_range(1000, 2000);
+ mdelay(1);
}
/*
* From L0, initiate MAC entry to gen2 if EP/RC supports gen2.
--
1.7.11.7
--
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