[B/C,1/1] sky2: Disable MSI on Dell Inspiron 1545 and Gateway P-79

Some sky2 chips fire IRQ after S3, before the driver is fully resumed:
[ 686.804877] do_IRQ: 1.37 No irq handler for vector

This is likely a platform bug that device isn't fully quiesced during
S3. Use MSI-X, maskable MSI or INTx can prevent this issue from
happening.

Since MSI-X and maskable MSI are not supported by this device, fallback
to use INTx on affected platforms.

BugLink: https://bugs.launchpad.net/bugs/1807259
BugLink: https://bugs.launchpad.net/bugs/1809843
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit b33b7cd6fd86478dd2890a9abeb6f036aa01fdf7)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/net/ethernet/marvell/sky2.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

On 6/13/19 7:31 PM, Kai-Heng Feng wrote:
> Some sky2 chips fire IRQ after S3, before the driver is fully resumed:
> [ 686.804877] do_IRQ: 1.37 No irq handler for vector
> 
> This is likely a platform bug that device isn't fully quiesced during
> S3. Use MSI-X, maskable MSI or INTx can prevent this issue from
> happening.
> 
> Since MSI-X and maskable MSI are not supported by this device, fallback
> to use INTx on affected platforms.
> 
> BugLink: https://bugs.launchpad.net/bugs/1807259
> BugLink: https://bugs.launchpad.net/bugs/1809843
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> Signed-off-by: David S. Miller <davem@davemloft.net>
> (cherry picked from commit b33b7cd6fd86478dd2890a9abeb6f036aa01fdf7)
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

As mentioned, already in Disco for some time.

Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

Thank you,
Kleber

> ---
>  drivers/net/ethernet/marvell/sky2.c | 24 +++++++++++++++++++++++-
>  1 file changed, 23 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
> index ae2f35039343..1485f66cf7b0 100644
> --- a/drivers/net/ethernet/marvell/sky2.c
> +++ b/drivers/net/ethernet/marvell/sky2.c
> @@ -46,6 +46,7 @@
>  #include <linux/mii.h>
>  #include <linux/of_device.h>
>  #include <linux/of_net.h>
> +#include <linux/dmi.h>
>  
>  #include <asm/irq.h>
>  
> @@ -93,7 +94,7 @@ static int copybreak __read_mostly = 128;
>  module_param(copybreak, int, 0);
>  MODULE_PARM_DESC(copybreak, "Receive copy threshold");
>  
> -static int disable_msi = 0;
> +static int disable_msi = -1;
>  module_param(disable_msi, int, 0);
>  MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");
>  
> @@ -4931,6 +4932,24 @@ static const char *sky2_name(u8 chipid, char *buf, int sz)
>  	return buf;
>  }
>  
> +static const struct dmi_system_id msi_blacklist[] = {
> +	{
> +		.ident = "Dell Inspiron 1545",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
> +			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1545"),
> +		},
> +	},
> +	{
> +		.ident = "Gateway P-79",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "Gateway"),
> +			DMI_MATCH(DMI_PRODUCT_NAME, "P-79"),
> +		},
> +	},
> +	{}
> +};
> +
>  static int sky2_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  {
>  	struct net_device *dev, *dev1;
> @@ -5042,6 +5061,9 @@ static int sky2_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  		goto err_out_free_pci;
>  	}
>  
> +	if (disable_msi == -1)
> +		disable_msi = !!dmi_check_system(msi_blacklist);
> +
>  	if (!disable_msi && pci_enable_msi(pdev) == 0) {
>  		err = sky2_test_msi(hw);
>  		if (err) {
>