On 11/19/21 13:11, Baokun Li wrote:
> Trying to remove the fsl-sata module in the PPC64 GNU/Linux
> leads to the following warning:
> ------------[ cut here ]------------
> remove_proc_entry: removing non-empty directory 'irq/69',
> leaking at least 'fsl-sata[ff0221000.sata]'
> WARNING: CPU: 3 PID: 1048 at fs/proc/generic.c:722
> .remove_proc_entry+0x20c/0x220
> IRQMASK: 0
> NIP [c00000000033826c] .remove_proc_entry+0x20c/0x220
> LR [c000000000338268] .remove_proc_entry+0x208/0x220
> Call Trace:
> .remove_proc_entry+0x208/0x220 (unreliable)
> .unregister_irq_proc+0x104/0x140
> .free_desc+0x44/0xb0
> .irq_free_descs+0x9c/0xf0
> .irq_dispose_mapping+0x64/0xa0
> .sata_fsl_remove+0x58/0xa0 [sata_fsl]
> .platform_drv_remove+0x40/0x90
> .device_release_driver_internal+0x160/0x2c0
> .driver_detach+0x64/0xd0
> .bus_remove_driver+0x70/0xf0
> .driver_unregister+0x38/0x80
> .platform_driver_unregister+0x14/0x30
> .fsl_sata_driver_exit+0x18/0xa20 [sata_fsl]
> ---[ end trace 0ea876d4076908f5 ]---
>
> The driver creates the mapping by calling irq_of_parse_and_map(),
> so it also has to dispose the mapping. But the easy way out is to
> simply use platform_get_irq() instead of irq_of_parse_map().
>
> In this case the mapping is not managed by the device but by
> the of core, so the device has not to dispose the mapping.
>
> Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
> Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
> ---
> drivers/ata/sata_fsl.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
> index 30759fd1c3a2..011daac4a14e 100644
> --- a/drivers/ata/sata_fsl.c
> +++ b/drivers/ata/sata_fsl.c
> @@ -1493,7 +1493,7 @@ static int sata_fsl_probe(struct platform_device *ofdev)
> host_priv->ssr_base = ssr_base;
> host_priv->csr_base = csr_base;
>
> - irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
> + irq = platform_get_irq(ofdev, 0);
> if (!irq) {
Please see the kdoc comment for platform_get_irq() in
drivers/base/platform.c. The error check must be "if (irq < 0)".
Can you send a V2 with that fixed and tested ?
> dev_err(&ofdev->dev, "invalid irq from platform\n");
> goto error_exit_with_cleanup;
> @@ -1570,8 +1570,6 @@ static int sata_fsl_remove(struct platform_device *ofdev)
>
> ata_host_detach(host);
>
> - irq_dispose_mapping(host_priv->irq);
> -
> return 0;
> }
>
>
--
Damien Le Moal
Western Digital Research
