Hello Chaotian Jing,
The patch 6397b7f5f405: "mmc: mediatek: add HS400 support" from Oct
27, 2015, leads to the following static checker warning:
drivers/mmc/host/mtk-sd.c:1320 msdc_tune_response()
error: XXX potentially using uninitialized 'cmd_err'.
drivers/mmc/host/mtk-sd.c
1306 static int msdc_tune_response(struct mmc_host *mmc, u32 opcode)
1307 {
1308 struct msdc_host *host = mmc_priv(mmc);
1309 u32 rise_delay = 0, fall_delay = 0;
1310 struct msdc_delay_phase final_rise_delay, final_fall_delay;
1311 u8 final_delay, final_maxlen;
1312 int cmd_err;
^^^^^^^
1313 int i;
1314
1315 sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
1316 for (i = 0 ; i < PAD_DELAY_MAX; i++) {
1317 sdr_set_field(host->base + MSDC_PAD_TUNE,
1318 MSDC_PAD_TUNE_CMDRDLY, i);
1319 mmc_send_tuning(mmc, opcode, &cmd_err);
^^^^^^^^
If kmalloc fails then it's not initialized.
1320 if (!cmd_err)
^^^^^^^
1321 rise_delay |= (1 << i);
1322 }
regards,
dan carpenter
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