Patchwork pciehp: Acknowledge the spurious "cmd completed" event.

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Submitter Rajat Jain
Date Feb. 21, 2014, 1:42 a.m.
Message ID <5306AF07.6000601@gmail.com>
Download mbox | patch
Permalink /patch/322387/
State Accepted
Headers show

Comments

Rajat Jain - Feb. 21, 2014, 1:42 a.m.
In case of a spurious "cmd completed", pcie_write_cmd() does not
clear it, but yet expects more "cmd completed" events to be generated.
This does not happen because the previous (spurious) event has not
been acknowledged. Fix that.

Signed-off-by: Rajat Jain <rajatxjain@gmail.com>
Signed-off-by: Rajat Jain <rajatjain@juniper.net>
Signed-off-by: Guenter Roeck <groeck@juniper.net>
---
 drivers/pci/hotplug/pciehp_hpc.c |    2 ++
 1 file changed, 2 insertions(+)
Bjorn Helgaas - April 24, 2014, 10:48 p.m.
On Thu, Feb 20, 2014 at 05:42:31PM -0800, Rajat Jain wrote:
> In case of a spurious "cmd completed", pcie_write_cmd() does not
> clear it, but yet expects more "cmd completed" events to be generated.
> This does not happen because the previous (spurious) event has not
> been acknowledged. Fix that.
> 
> Signed-off-by: Rajat Jain <rajatxjain@gmail.com>
> Signed-off-by: Rajat Jain <rajatjain@juniper.net>
> Signed-off-by: Guenter Roeck <groeck@juniper.net>

Applied to pci/hotplug for v3.16, thanks!

> ---
>  drivers/pci/hotplug/pciehp_hpc.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
> index d7d058f..1463412 100644
> --- a/drivers/pci/hotplug/pciehp_hpc.c
> +++ b/drivers/pci/hotplug/pciehp_hpc.c
> @@ -159,6 +159,8 @@ static void pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
>  
>  	pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
>  	if (slot_status & PCI_EXP_SLTSTA_CC) {
> +		pcie_capability_write_word(pdev, PCI_EXP_SLTSTA,
> +					   PCI_EXP_SLTSTA_CC);
>  		if (!ctrl->no_cmd_complete) {
>  			/*
>  			 * After 1 sec and CMD_COMPLETED still not set, just
> -- 
> 1.7.9.5
> 
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Patch

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index d7d058f..1463412 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -159,6 +159,8 @@  static void pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
 
 	pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
 	if (slot_status & PCI_EXP_SLTSTA_CC) {
+		pcie_capability_write_word(pdev, PCI_EXP_SLTSTA,
+					   PCI_EXP_SLTSTA_CC);
 		if (!ctrl->no_cmd_complete) {
 			/*
 			 * After 1 sec and CMD_COMPLETED still not set, just