Messages in this thread | | | Subject | Re: [PATCH -next 2/2] sata_fsl: fix warning in remove_proc_entry when rmmod sata_fsl | From | "libaokun (A)" <> | Date | Sat, 20 Nov 2021 10:18:41 +0800 |
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在 2021/11/19 23:43, Sergei Shtylyov 写道: > Hello! > > On 19.11.2021 7:11, 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(). > > Not that easy. :-) > >> 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@huawei.com> >> Signed-off-by: Baokun Li <libaokun1@huawei.com> >> --- >> 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) { > > if (irq < 0) { > > platform_get_irq() returns negative error codes, not 0 on failure. > > [...] > > MBR, Sergey > .
I didn't notice the change in this return value, and the test didn't cover the error branch.
Thank you very much for your advice.
I'm about to send a patch v2 with the changes suggested by you.
-- With Best Regards, Baokun Li .
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