drivers/i2c/busses/i2c-tegra.c:935:21: sparse: sparse: incorrect type in assignment (different base types)
From: kernel test robot
Date: Sun Jun 14 2026 - 19:45:07 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8cd9520d35a6c38db6567e97dd93b1f11f185dc6
commit: 73e65c424867fb9396de6d1265228b75e1ee0718 i2c: tegra: enable compile testing on all archs
date: 3 months ago
config: s390-randconfig-r113-20260614 (https://download.01.org/0day-ci/archive/20260615/202606150754.zgRoeRqx-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 15.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260615/202606150754.zgRoeRqx-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
| Fixes: 73e65c424867 ("i2c: tegra: enable compile testing on all archs")
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606150754.zgRoeRqx-lkp@xxxxxxxxx/
sparse warnings: (new ones prefixed by >>)
>> drivers/i2c/busses/i2c-tegra.c:935:21: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [assigned] [usertype] val @@ got restricted __le32 [usertype] @@
drivers/i2c/busses/i2c-tegra.c:935:21: sparse: expected unsigned int [assigned] [usertype] val
drivers/i2c/busses/i2c-tegra.c:935:21: sparse: got restricted __le32 [usertype]
drivers/i2c/busses/i2c-tegra.c:1012:23: sparse: sparse: cast to restricted __le32
vim +935 drivers/i2c/busses/i2c-tegra.c
77821b4678f93b Shardar Shariff Md 2016-08-31 890
df384fa58a321a Dmitry Osipenko 2020-09-30 891 static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
df384fa58a321a Dmitry Osipenko 2020-09-30 892 {
df384fa58a321a Dmitry Osipenko 2020-09-30 893 size_t buf_remaining = i2c_dev->msg_buf_remaining;
89e3748acd0bf6 Dmitry Osipenko 2020-09-30 894 unsigned int words_to_transfer, rx_fifo_avail;
89e3748acd0bf6 Dmitry Osipenko 2020-09-30 895 u8 *buf = i2c_dev->msg_buf;
89e3748acd0bf6 Dmitry Osipenko 2020-09-30 896 u32 val;
df384fa58a321a Dmitry Osipenko 2020-09-30 897
df384fa58a321a Dmitry Osipenko 2020-09-30 898 /*
94a5573f0719cf Dmitry Osipenko 2020-09-30 899 * Catch overflow due to message fully sent before the check for
94a5573f0719cf Dmitry Osipenko 2020-09-30 900 * RX FIFO availability.
df384fa58a321a Dmitry Osipenko 2020-09-30 901 */
df384fa58a321a Dmitry Osipenko 2020-09-30 902 if (WARN_ON_ONCE(!(i2c_dev->msg_buf_remaining)))
df384fa58a321a Dmitry Osipenko 2020-09-30 903 return -EINVAL;
df384fa58a321a Dmitry Osipenko 2020-09-30 904
df384fa58a321a Dmitry Osipenko 2020-09-30 905 if (i2c_dev->hw->has_mst_fifo) {
df384fa58a321a Dmitry Osipenko 2020-09-30 906 val = i2c_readl(i2c_dev, I2C_MST_FIFO_STATUS);
df384fa58a321a Dmitry Osipenko 2020-09-30 907 rx_fifo_avail = FIELD_GET(I2C_MST_FIFO_STATUS_RX, val);
df384fa58a321a Dmitry Osipenko 2020-09-30 908 } else {
df384fa58a321a Dmitry Osipenko 2020-09-30 909 val = i2c_readl(i2c_dev, I2C_FIFO_STATUS);
df384fa58a321a Dmitry Osipenko 2020-09-30 910 rx_fifo_avail = FIELD_GET(I2C_FIFO_STATUS_RX, val);
df384fa58a321a Dmitry Osipenko 2020-09-30 911 }
df384fa58a321a Dmitry Osipenko 2020-09-30 912
94a5573f0719cf Dmitry Osipenko 2020-09-30 913 /* round down to exclude partial word at the end of buffer */
df384fa58a321a Dmitry Osipenko 2020-09-30 914 words_to_transfer = buf_remaining / BYTES_PER_FIFO_WORD;
df384fa58a321a Dmitry Osipenko 2020-09-30 915 if (words_to_transfer > rx_fifo_avail)
df384fa58a321a Dmitry Osipenko 2020-09-30 916 words_to_transfer = rx_fifo_avail;
df384fa58a321a Dmitry Osipenko 2020-09-30 917
df384fa58a321a Dmitry Osipenko 2020-09-30 918 i2c_readsl(i2c_dev, buf, I2C_RX_FIFO, words_to_transfer);
df384fa58a321a Dmitry Osipenko 2020-09-30 919
df384fa58a321a Dmitry Osipenko 2020-09-30 920 buf += words_to_transfer * BYTES_PER_FIFO_WORD;
df384fa58a321a Dmitry Osipenko 2020-09-30 921 buf_remaining -= words_to_transfer * BYTES_PER_FIFO_WORD;
df384fa58a321a Dmitry Osipenko 2020-09-30 922 rx_fifo_avail -= words_to_transfer;
df384fa58a321a Dmitry Osipenko 2020-09-30 923
df384fa58a321a Dmitry Osipenko 2020-09-30 924 /*
94a5573f0719cf Dmitry Osipenko 2020-09-30 925 * If there is a partial word at the end of buffer, handle it
94a5573f0719cf Dmitry Osipenko 2020-09-30 926 * manually to prevent overwriting past the end of buffer.
df384fa58a321a Dmitry Osipenko 2020-09-30 927 */
df384fa58a321a Dmitry Osipenko 2020-09-30 928 if (rx_fifo_avail > 0 && buf_remaining > 0) {
df384fa58a321a Dmitry Osipenko 2020-09-30 929 /*
df384fa58a321a Dmitry Osipenko 2020-09-30 930 * buf_remaining > 3 check not needed as rx_fifo_avail == 0
df384fa58a321a Dmitry Osipenko 2020-09-30 931 * when (words_to_transfer was > rx_fifo_avail) earlier
df384fa58a321a Dmitry Osipenko 2020-09-30 932 * in this function.
df384fa58a321a Dmitry Osipenko 2020-09-30 933 */
df384fa58a321a Dmitry Osipenko 2020-09-30 934 val = i2c_readl(i2c_dev, I2C_RX_FIFO);
df384fa58a321a Dmitry Osipenko 2020-09-30 @935 val = cpu_to_le32(val);
df384fa58a321a Dmitry Osipenko 2020-09-30 936 memcpy(buf, &val, buf_remaining);
df384fa58a321a Dmitry Osipenko 2020-09-30 937 buf_remaining = 0;
df384fa58a321a Dmitry Osipenko 2020-09-30 938 rx_fifo_avail--;
df384fa58a321a Dmitry Osipenko 2020-09-30 939 }
df384fa58a321a Dmitry Osipenko 2020-09-30 940
df384fa58a321a Dmitry Osipenko 2020-09-30 941 /* RX FIFO must be drained, otherwise it's an Overflow case. */
df384fa58a321a Dmitry Osipenko 2020-09-30 942 if (WARN_ON_ONCE(rx_fifo_avail))
df384fa58a321a Dmitry Osipenko 2020-09-30 943 return -EINVAL;
df384fa58a321a Dmitry Osipenko 2020-09-30 944
df384fa58a321a Dmitry Osipenko 2020-09-30 945 i2c_dev->msg_buf_remaining = buf_remaining;
df384fa58a321a Dmitry Osipenko 2020-09-30 946 i2c_dev->msg_buf = buf;
df384fa58a321a Dmitry Osipenko 2020-09-30 947
df384fa58a321a Dmitry Osipenko 2020-09-30 948 return 0;
df384fa58a321a Dmitry Osipenko 2020-09-30 949 }
df384fa58a321a Dmitry Osipenko 2020-09-30 950
:::::: The code at line 935 was first introduced by commit
:::::: df384fa58a321a88b22499a43cb5c5d0fb9f5364 i2c: tegra: Reorder location of functions in the code
:::::: TO: Dmitry Osipenko <digetx@xxxxxxxxx>
:::::: CC: Wolfram Sang <wsa@xxxxxxxxxx>
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