Re: [PATCH char-misc-next v2 4/4] issei: add driver to driver interface
From: kernel test robot
Date: Mon Oct 19 2026 - 02:20:30 EST
Hi Alexander,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 79e5797d243a466138f641932f81dc69f796060c]
url: https://github.com/intel-lab-lkp/linux/commits/Alexander-Usyskin/issei-save-power_down-flag-while-processing-event/20261018-123052
base: 79e5797d243a466138f641932f81dc69f796060c
patch link: https://lore.kernel.org/r/20261018-issei_pm_and_itf-v2-4-7a07452e3606%40intel.com
patch subject: [PATCH char-misc-next v2 4/4] issei: add driver to driver interface
config: i386-randconfig-1001-20261019 (https://download.01.org/0day-ci/archive/20261019/202610191455.cc2xaeEs-lkp@xxxxxxxxx/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261019/202610191455.cc2xaeEs-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610191455.cc2xaeEs-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
>> drivers/misc/issei/issei_device.c:163:59: warning: format specifies type 'long' but the argument has type 'ssize_t' (aka 'int') [-Wformat]
163 | dev_dbg(&idev->dev, "Failed writing data ret = %ld\n", ret);
| ~~~ ^~~
| %zd
include/linux/dev_printk.h:171:49: note: expanded from macro 'dev_dbg'
171 | dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
| ~~~ ^~~~~~~~~~~
include/linux/dev_printk.h:139:35: note: expanded from macro 'dev_no_printk'
139 | _dev_printk(level, dev, fmt, ##__VA_ARGS__); \
| ~~~ ^~~~~~~~~~~
1 warning generated.
vim +163 drivers/misc/issei/issei_device.c
113
114 /**
115 * issei_device_write - send data to the firmware client.
116 * @ctx: opaque context
117 * @ubuf: data to send
118 * @length: data length
119 * @timeout: operation timeout in milliseconds
120 *
121 * Return: >=0 data length on success, <0 on error
122 */
123 ssize_t issei_device_write(void *ctx, const u8 *ubuf, size_t length, unsigned long timeout)
124 {
125 struct issei_host_client *cl = ctx;
126 struct issei_device *idev = cl->idev;
127 ssize_t ret;
128 long wret;
129
130 if (idev->rst_state != ISSEI_RST_STATE_DONE) {
131 dev_dbg(&idev->dev, "Device is in transition\n");
132 return -EBUSY;
133 }
134
135 if (!length)
136 return 0;
137
138 /* sanity check */
139 if (length > idev->dma.length.h2f) {
140 dev_dbg(&idev->dev, "Write is too big %zu > %zu\n", length,
141 idev->dma.length.h2f);
142 return -EFBIG;
143 }
144
145 u8 *buf __free(kfree) = kmemdup(ubuf, length, GFP_KERNEL);
146 if (!buf)
147 return -ENOMEM;
148
149 do {
150 ret = issei_cl_write(cl, buf, length);
151 if (ret < 0 && ret != -EAGAIN)
152 return ret;
153 /* buf is consumed by issei_cl_write on success */
154 if (ret >= 0)
155 retain_and_null_ptr(buf);
156 wret = wait_event_interruptible_timeout(cl->write_wait,
157 issei_cl_check_write(cl) != 1,
158 msecs_to_jiffies(timeout));
159 if (wret == 0) /* timeout */
160 wret = -ETIMEDOUT;
161 if (wret < 0) {
162 issei_cl_clean_all_wbuf(cl);
> 163 dev_dbg(&idev->dev, "Failed writing data ret = %ld\n", ret);
164 return wret;
165 }
166 } while (ret == -EAGAIN);
167
168 return ret;
169 }
170 EXPORT_SYMBOL_GPL(issei_device_write);
171
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki