linux-kernel - [PATCH v2] staging: comedi: cb_pcidas: fix request

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Message-Id: <20210315195914.4801-1-ztong0001@gmail.com>
Date:   Mon, 15 Mar 2021 15:59:14 -0400
From:   Tong Zhang <ztong0001@...il.com>
To:     Ian Abbott <abbotti@....co.uk>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tong Zhang <ztong0001@...il.com>,
        "Alexander A. Klimov" <grandmaster@...klimov.de>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] staging: comedi: cb_pcidas: fix request_irq() warn

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@....co.uk>
Signed-off-by: Tong Zhang <ztong0001@...il.com>
---
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);
-- 
2.25.1