Re: [Pcihpd-discuss] [PATCH] correct pciehp init recovery

[Kristen Accardi]

On Fri, 2006-04-28 at 16:59 +0200, Jan Beulich wrote:
> Clean up the recovery path from errors during pcie_init().
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
> 
> diff -Npru /home/jbeulich/tmp/linux-2.6.17-rc3/drivers/pci/hotplug/pciehp_hpc.c
> 2.6.17-rc3-pciehp-init-recovery/drivers/pci/hotplug/pciehp_hpc.c
> --- /home/jbeulich/tmp/linux-2.6.17-rc3/drivers/pci/hotplug/pciehp_hpc.c	2006-04-27 17:49:41.000000000 +0200
> +++ 2.6.17-rc3-pciehp-init-recovery/drivers/pci/hotplug/pciehp_hpc.c	2006-04-28 09:20:55.000000000 +0200
> @@ -1474,7 +1474,7 @@ int pcie_init(struct controller * ctrl, 
>  	rc = hp_register_read_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
>  	if (rc) {
>  		err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
> -		goto abort_free_ctlr;
> +		goto abort_free_irq;
>  	}
>  

It's possible that this driver never actually requested an irq if was in
poll mode.  Then you will call free_irq, when what you really want to do
is kill the timer that may have been started. 



>  	intr_enable = intr_enable | PRSN_DETECT_ENABLE;
> @@ -1500,19 +1500,19 @@ int pcie_init(struct controller * ctrl, 
>  	rc = hp_register_write_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
>  	if (rc) {
>  		err("%s : hp_register_write_word SLOT_CTRL failed\n", __FUNCTION__);
> -		goto abort_free_ctlr;
> +		goto abort_free_irq;
>  	}
>  	rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), slot_status);
>  	if (rc) {
>  		err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
> -		goto abort_free_ctlr;
> +		goto abort_disable_intr;
>  	}
>  	
>  	temp_word =  0x1F; /* Clear all events */
>  	rc = hp_register_write_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), temp_word);
>  	if (rc) {
>  		err("%s : hp_register_write_word SLOT_STATUS failed\n", __FUNCTION__);
> -		goto abort_free_ctlr;
> +		goto abort_disable_intr;
>  	}
>  	
>  	if (pciehp_force) {
> @@ -1521,7 +1521,7 @@ int pcie_init(struct controller * ctrl, 
>  	} else {
>  		rc = pciehp_get_hp_hw_control_from_firmware(ctrl->pci_dev);
>  		if (rc)
> -			goto abort_free_ctlr;
> +			goto abort_disable_intr;
>  	}
>  
>  	/*  Add this HPC instance into the HPC list */
> @@ -1548,6 +1548,18 @@ int pcie_init(struct controller * ctrl, 
>  	return 0;
>  
>  	/* We end up here for the many possible ways to fail this API.  */
> +abort_disable_intr:
> +	rc = hp_register_read_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
> +	if (!rc) {
> +		temp_word &= ~(intr_enable | HP_INTR_ENABLE);
> +		rc = hp_register_write_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
> +	}
> +	if (rc)
> +		err("%s : disabling interrupts failed\n", __FUNCTION__);
> +
> +abort_free_irq:
> +	free_irq(php_ctlr->irq, ctrl);
> +
>  abort_free_ctlr:
>  	pcie_cap_base = saved_cap_base;
>  	kfree(php_ctlr);
> 
> 
> 
> 
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