Re: [PATCH v2] staging: comedi: cb_pcidas: fix request_irq() warn

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On 15/03/2021 19:59, Tong Zhang wrote:
request_irq() wont accept a name which contains slash so we need to
repalce it with something else -- otherwise it will trigger a warning
and the entry in /proc/irq/ will not be created
since the .name might be used by userspace and we don't want to break
userspace, so we are changing the parameters passed to request_irq()

[    1.630764] name 'pci-das1602/16'
[    1.630950] WARNING: CPU: 0 PID: 181 at fs/proc/generic.c:180 __xlate_proc_name+0x93/0xb0
[    1.634009] RIP: 0010:__xlate_proc_name+0x93/0xb0
[    1.639441] Call Trace:
[    1.639976]  proc_mkdir+0x18/0x20
[    1.641946]  request_threaded_irq+0xfe/0x160
[    1.642186]  cb_pcidas_auto_attach+0xf4/0x610 [cb_pcidas]

Suggested-by: Ian Abbott <abbotti@xxxxxxxxx>
Signed-off-by: Tong Zhang <ztong0001@xxxxxxxxx>
---
v2: revert changes to .name field so that we dont break userspace

  drivers/staging/comedi/drivers/cb_pcidas.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/comedi/drivers/cb_pcidas.c b/drivers/staging/comedi/drivers/cb_pcidas.c
index d740c4782775..2f20bd56ec6c 100644
--- a/drivers/staging/comedi/drivers/cb_pcidas.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas.c
@@ -1281,7 +1281,7 @@ static int cb_pcidas_auto_attach(struct comedi_device *dev,
  	     devpriv->amcc + AMCC_OP_REG_INTCSR);
ret = request_irq(pcidev->irq, cb_pcidas_interrupt, IRQF_SHARED,
-			  dev->board_name, dev);
+			  "cb_pcidas", dev);
  	if (ret) {
  		dev_dbg(dev->class_dev, "unable to allocate irq %d\n",
  			pcidev->irq);


Looks good.

Reviewed-by: Ian Abbott <abbotti@xxxxxxxxx>

--
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