Re: [PATCH 1/1] drivers/staging/pi433: New driver (fwd)

Julia Lawall
2017-07-15T20:50:01Z

Please check on lines 894 and 688 (not shown) for the issues mentioned
below.

Note that the ifs and {s in the following code snippet don't always follow
the kernel coding style, eg on line 901.

julia

---------- Forwarded message ----------
Date: Sun, 16 Jul 2017 04:35:49 +0800
From: kbuild test robot <fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: kbuild-JC7UmRfGjtg@public.gmane.org
Cc: Julia Lawall <julia.lawall-L2FTfq7BK8M@public.gmane.org>
Subject: Re: [PATCH 1/1] drivers/staging/pi433: New driver

Hi Wolf,

[auto build test WARNING on staging/staging-testing]
[also build test WARNING on v4.12 next-20170714]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Wolf-Entwicklungen/drivers-staging-pi433-New-driver/20170716-021625
:::::: branch date: 2 hours ago
:::::: commit date: 2 hours ago

>> drivers/staging/pi433/pi433_if.c:894:18-21: ERROR: device is NULL but dereferenced.
--
>> drivers/staging/pi433/pi433_if.c:688:5-19: WARNING: Unsigned expression compared with zero: bytes_received >= 0

git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 6b5d85fc273ec7c19addf7770155414da647de7e
vim +894 drivers/staging/pi433/pi433_if.c

6b5d85fc Wolf Entwicklungen 2017-07-15 883
6b5d85fc Wolf Entwicklungen 2017-07-15 884 static int pi433_open(struct inode *inode, struct file *filp)
6b5d85fc Wolf Entwicklungen 2017-07-15 885 {
6b5d85fc Wolf Entwicklungen 2017-07-15 886 struct pi433_device *device;
6b5d85fc Wolf Entwicklungen 2017-07-15 887 struct pi433_instance *instance;
6b5d85fc Wolf Entwicklungen 2017-07-15 888
6b5d85fc Wolf Entwicklungen 2017-07-15 889 mutex_lock(&minor_lock);
6b5d85fc Wolf Entwicklungen 2017-07-15 890 device = idr_find(&pi433_idr, iminor(inode));
6b5d85fc Wolf Entwicklungen 2017-07-15 891
6b5d85fc Wolf Entwicklungen 2017-07-15 892 mutex_unlock(&minor_lock);
6b5d85fc Wolf Entwicklungen 2017-07-15 893 if (!device) {
6b5d85fc Wolf Entwicklungen 2017-07-15 @894 dev_dbg(device->dev, "device: minor %d unknown.\n", iminor(inode));
6b5d85fc Wolf Entwicklungen 2017-07-15 895 return -ENODEV;
6b5d85fc Wolf Entwicklungen 2017-07-15 896 }
6b5d85fc Wolf Entwicklungen 2017-07-15 897
6b5d85fc Wolf Entwicklungen 2017-07-15 898 if (!device->rx_buffer) {
6b5d85fc Wolf Entwicklungen 2017-07-15 899 device->rx_buffer = kmalloc(MAX_MSG_SIZE, GFP_KERNEL);
6b5d85fc Wolf Entwicklungen 2017-07-15 900 if (!device->rx_buffer)
6b5d85fc Wolf Entwicklungen 2017-07-15 901 {
6b5d85fc Wolf Entwicklungen 2017-07-15 902 dev_dbg(device->dev, "open/ENOMEM\n");
6b5d85fc Wolf Entwicklungen 2017-07-15 903 return -ENOMEM;
6b5d85fc Wolf Entwicklungen 2017-07-15 904 }
6b5d85fc Wolf Entwicklungen 2017-07-15 905 }
6b5d85fc Wolf Entwicklungen 2017-07-15 906
6b5d85fc Wolf Entwicklungen 2017-07-15 907 device->users++;
6b5d85fc Wolf Entwicklungen 2017-07-15 908 instance = kzalloc(sizeof(*instance), GFP_KERNEL);
6b5d85fc Wolf Entwicklungen 2017-07-15 909 if (!instance)
6b5d85fc Wolf Entwicklungen 2017-07-15 910 {
6b5d85fc Wolf Entwicklungen 2017-07-15 911 kfree(device->rx_buffer);
6b5d85fc Wolf Entwicklungen 2017-07-15 912 device->rx_buffer = NULL;
6b5d85fc Wolf Entwicklungen 2017-07-15 913 return -ENOMEM;
6b5d85fc Wolf Entwicklungen 2017-07-15 914 }
6b5d85fc Wolf Entwicklungen 2017-07-15 915
6b5d85fc Wolf Entwicklungen 2017-07-15 916 /* setup instance data*/
6b5d85fc Wolf Entwicklungen 2017-07-15 917 instance->device = device;
6b5d85fc Wolf Entwicklungen 2017-07-15 918 instance->tx_cfg.bit_rate = 4711;
6b5d85fc Wolf Entwicklungen 2017-07-15 919 // TODO: fill instance->tx_cfg;
6b5d85fc Wolf Entwicklungen 2017-07-15 920
6b5d85fc Wolf Entwicklungen 2017-07-15 921 /* instance data as context */
6b5d85fc Wolf Entwicklungen 2017-07-15 922 filp->private_data = instance;
6b5d85fc Wolf Entwicklungen 2017-07-15 923 nonseekable_open(inode, filp);
6b5d85fc Wolf Entwicklungen 2017-07-15 924
6b5d85fc Wolf Entwicklungen 2017-07-15 925 return 0;
6b5d85fc Wolf Entwicklungen 2017-07-15 926 }
6b5d85fc Wolf Entwicklungen 2017-07-15 927

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