[linuxtv-media:master 479/499] drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c:181:1: warning: 'rtl2832_sdr_wr' uses dynamic stack allocation

[kbuild test robot]

tree:   git://linuxtv.org/media_tree.git master
head:   ba35ca07080268af1badeb47de0f9eff28126339
commit: 771138920eafa399f68d3492c8a75dfeea23474b [479/499] [media] rtl2832_sdr: 
Realtek RTL2832 SDR driver module
config: make ARCH=s390 allmodconfig

All warnings:

   drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c: In function 
'rtl2832_sdr_wr':
>> drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c:181:1: warning: 
>> 'rtl2832_sdr_wr' uses dynamic stack allocation [enabled by default]

vim +/rtl2832_sdr_wr +181 drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c

   165                  }
   166          };
   167  
   168          buf[0] = reg;
   169          memcpy(&buf[1], val, len);
   170  
   171          ret = i2c_transfer(s->i2c, msg, 1);
   172          if (ret == 1) {
   173                  ret = 0;
   174          } else {
   175                  dev_err(&s->i2c->dev,
   176                          "%s: I2C wr failed=%d reg=%02x len=%d\n",
   177                          KBUILD_MODNAME, ret, reg, len);
   178                  ret = -EREMOTEIO;
   179          }
   180          return ret;
 > 181  }
   182  
   183  /* read multiple hardware registers */
   184  static int rtl2832_sdr_rd(struct rtl2832_sdr_state *s, u8 reg, u8 *val, 
int len)
   185  {
   186          int ret;
   187          struct i2c_msg msg[2] = {
   188                  {
   189                          .addr = s->cfg->i2c_addr,

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